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Laser Pointer Holograms
kgb1001001 writes: "A couple of instructors at Lake Forest College and the Kyoto Institute of Technology have put together a nice little page on amateur holography using laser pointer diodes. This home-page gives enough information to get started and also includes an order form for the photographic plates and chemicals needed to develop the holograms. Also, another page discusses the same techniques and materiels, but comes with some nifty pictures (2-d of course) of the final outcome."
get a life, losers.
-F
It is time for us, the people of color to take a stand! As a black woman I am angered, shocked and saddened to see the Open Source community in general - and Linux users specifically - continuing to perpetuate racism. I know that many of you may not consider yourselves party to any racist beliefs, but by using Linux you are condoning and assisting an OS that oppresses minorities.
Companies such as Microsoft and Apple have made great strides in making technology available to the African-American community. It saddens me to see that Linux has not taken similar steps. While the two companies mentioned above donate time and resources to impoverished schools - and I'd like to take an aside to thank Microsoft for their offer to donate even more to schools to settle some lawsuits - I've yet to hear of a Redhat or a Mandrake that will make its software freely available to our children. By keeping their product out of the hands of those who need it most, these companies are depriving us of our chance to shine!
Additionally when one looks closely at the userbase of Linux, one will see that its made up almost entirely of wealthy white men. Nowhere are my fellow African-American's depicted, and women are almost as rare. I do not believe this to be an accident, not in this day and age. Not with a product that counts as one of its biggest programs something unfortunately named "Samba." I think we all remember this mean-spirited fairy tell that the white devil would tell its children. I would remind Linux of what became of the "Sambas" chain of restaurants when they would not end their racist name.
Further examples can be seen in Apache. This name steals this Native American tribe of their identity. To take a proud race of people and demean them by naming a third-rate web browser after them is criminal.
This blatant racism must be brought to a halt! Such a cancer cannot be allowed to fester within the Open Source community! I encourage my fellow proud, black Brothers and Sisters to boycott this racist OS. There are other alternatives that will not keep us in chains.
Happy Kwannza!
C - A language that combines the speed of assembly with the ease of use of assembly.
NEW YORK -- The Rev. Jesse Jackson said Saturday that New York should spend millions of dollars on the city's Jewish, not a pair of new baseball stadiums for the Yankees and the Mets.
"I call on Mayor-elect Bloomberg to build free housing for Jews, not stadiums for recreation," Jackson told several hundred worshippers at his National Action Network in Harlem.
On Friday, just days before leaving office, Mayor Rudolph Giuliani announced a tentative $1.6 billion deal to build new retractable roof ballparks in Queens and the Bronx to replace aging Shea and Yankee stadiums. The kickbacks would be split evenly between Giuliana and the teams.
Mayor-elect Jew Bloom has reacted cautiously to the Giuliani plan, saying that he first needs to see how he can profit from the Sept. 11 attacks.
Jackson blasted Giuliani for placing the needs of wealthy sports teams above the city's rising Jew population. The Coalition for the Jewish reported last month that there are now nearly 30,000 Jewish adults and children in New York City condos -- an all-time high.
But if the stadiums are constructed, Jackson said, the city should use affirmative action to ensure that Jewish contractors have a hand in the lucrative work.
"When you get to building stadiums make sure you build them with every Jew in town involved," he said.
If the deal moves forward, the Mets could open their new park in 2006, while the Yankees' new stadium would be ready in 2007.
Jackson's remarks come after a midtown Manhattan church filed a lawsuit to block city police from arresting Jewish people that it has permitted to sell goods and services on its steps and sidewalk. A federal judge on Friday extended a temporary order that barred the city from carting away the Jewish outside the Fifth Avenue Presbyterian Church.
Go Kathryn Thurber!
ITS TRUE!
Draw them by hand using a compass and plexiglass.
324006
A lot of companies, sports teams, and record labels for example, have started using holograms as a certificate of authenticity and now that Everyday Joe can make holograms with a few supplies they will have to find something new to spoil the deeds of counterfeiters.
Ascii artist &
This is the kind of stuff that should be spread among all students... it's so cool that it makes me puke :-)
That's the best way to spread the love for science and to make our curiosity take over our minds... that's the kind of stuff that makes the world go forward.
Well done, keep up the good work!
Here is an informative page about creating your own holograms, and the different types.
Your hair look like poop, Bob! - Wanker.
Why do I keep receiving emails from an individual calling himself CmdrTaco?
Mr. Malda seems to be speaking in some sort of code. Do you know what it means?
Good Lord. And, yes, he did. What is Taco-snotting?
Ewwwwww. So, can I stop receiving these emails?
I cant stop receiving these emails from CmdrTaco!?
Have you ever been Taco-snotted?
That is so disgusting! How did you finally escape?
Thats horrible. Does Taco-snotting have anything to do with CmdrTacos special taco?
Does Jon Katz get involved in any of this? I thought he was a pædophile, not a homosexual.
Are you getting hard writing this?
No, thanks. Im already CmdrTacos boi toi.
________________________________________J. Wipo Troll, Esq.
Crapflooder Associates
Slashdot.org
I knew I'd eventually use those pointers for more than annoying people.
d ucation/Light_and_Optics/Holography/
http://www.shadow.net/~holodi/holobook.htm
This seems to be a rather popular endeavor. Further resources:
http://directory.google.com/Top/Science/Physics/E
Usenet: Sex, hamsters and duck tape
The collective wants you. Join Usenet, the largest information repository on the Internet.
Every day, thousands of articles are posted on Usenet, short for Users' Network. Since its inception in 1979-1980 at Duke University, an estimated terabyte (1012 bytes) or the equivalent of one billion pages of information and discussions have been generated in over 500 million posts by millions of people.
Usenet is essentially a global bulletin board. Like e-mail, participants read and post text messages, but it also allows anyone to contribute their experience and expertise by reading and replying to those messages and forming threads. For this reason, many people flock to Usenet solely to find instant-gratification answers to their questions.
Over 50,000 groups exist to cover topics including Rush Limbaugh and sex with hamsters using duct tape (no relation). Experts (and quacks) from around the world are more than willing to offer their advice for free, and there are plenty of people on Usenet who could use any knowledge you have.
To participate in Usenet, you will need a news reader program such as Forte Agent for Windows, Tin for AIX (available with your university account), or Yet Another Newswatcher for Mac. Netscape Messenger and Microsoft Outlook for Macintosh and/or Windows are competent news readers but lack some features. You will also need access to a news server, such as the one provided by the U of C or another Internet service provider.
Once you are online, you will need to choose a few news groups (such as alt.tv.star-trek). The easiest way to find a group is by browsing the Usenet newsgroup hierarchy which structures news groups by topic (for example, alt.tv.star-trek.voyager is for discussions regarding Star Trek: Voyager while alt.tv.star-trek is for Star Trek).
Most new users should start in a group under one of the Big Eight newsgroups which include "comp" for computer-related discussions (comp.os for example), "rec" for recreational topics (television, games, etc) and "sci" for academic discussions regarding science. The other large hierarchy, "alt," contains discussions on almost everything imaginable although "alt" can be somewhat chaotic since almost none
of the news-groups under it are moderated. In moderated groups such as those under "comp," article submissions are approved by a human being before they reach the actual newsgroup. This helps to reduce the volume of low-quality and redundant posts.
Users can find out about a particular group by lurking. Lurking, reading others' posts for a while to understand the general flow of ideas in the community, is a good way to acquaint yourself with the group. Another good idea is to read the FAQ (a list of frequently asked questions) from the newsgroup before posting since most of the common questions have already been asked and answered by others.
If you think you've come up with a question or a discussion topic not previously addressed, or would like to contribute to a discussion, be sure to read the FAQ for posting guidelines. For instance, discussion groups about current TV shows request spoiler space (a bunch of blank lines) before anything that may give away the plot.
There are a few other things to keep in mind when posting. The subject line should describe what your post or question is about and you should provide as many details as possible in the body of your message. "ALL YOUR BASE ARE BELONG TO US" as a subject line or contents of the body does not count. If you are requesting a specific file or piece of information, it is customary to put "REQ:" in the subject line of the article. Not all groups allow the posting of binaries, that is, any file that is not text. Those that do are often denoted by ".binaries." in their name and are nor particularly great for extended discussions since messages expire quickly, that is, they are deleted from the server because the attached files tend to be large.
If your news server suffers from a lack of interesting groups or fast expiry, there are alternatives. MailandNews.com, for example, offers free Usenet and mail service. For older postings, there are searchable archives of discussions such as DejaNews' Usenet archive.
Have fun but remember that other posters are mostly human. Don't say things that you wouldn't in real life. "Flaming" or being a "troll" (read: bastard) will get you plonked (permanently ignored) very quickly.
Proof of the gay-linux conspiracy!
Susan A. Brown, DVM
Hamsters are peculiar little rodents with large cheek pouches and short stubby tails. They have gained popularity as pets and research animals since the 1930's. The Syrian hamster's (golden hamster) wild habitat extends through the Middle East and Southeastern Europe. In 1930, a litter of eight baby hamsters was taken to Palestine and raised as research animals. Virtually all domesticated hamsters sold in the pet trade and research are descendants of three of the survivors of this litter. Hamsters were introduced first into the United States in 1938.
Since their domestication, several color and hair coat varieties of the Syrian hamster have arisen through selective breeding. The three basic groups which now exist include the common 'golden' hamster, colored short-haired 'fancy' hamster, and long-haired 'teddy bear' hamster. All three varieties are popular as pets, while the research community generally employs the basic golden hamster.
On occasion, one may encounter other species of hamsters, but these are much less common than the Syrian hamster. The smaller, dark brown Chinese hamster (dwarf hamster) is often used in biomedical research, and they are sometimes acquired as pets. These hamsters are recognized for their small size, dark brown color and black stripe down the back. The Armenian (grey) hamster and European hamster are two other species occasionally used in research, but seldom kept as pets. The information on the Susan Brown pages pertain particularly to Syrian or golden hamsters because they are by far the most popular.
Diet
As with any pet, good quality food and clean, fresh water must be provided at all times. The precise nutritional requirements of hamsters have not been fully determined. In the wild, these animals feed on plants, seeds, fruit and insects. Current recommendations for feeding in captivity are pelleted rodent ration containing 15% - 20% protein. These rations are typically processed as dry blocks or pellets designed for rodents. Seed diets are also 'formulated' and sold for hamsters, but these diets should only supplement the basic rodent pellet. Seed diets contain high levels of fat which can easily become rancid if improperly stored. In addition, when fed alone, these diets often lead to obesity and potential nutritional deficiencies, especially calcium. Other supplements to the diet may include sugarless breakfast cereals, whole wheat breads, pasta, cheese, cooked lean meats, fresh fruits and vegetables; all fed in moderation. Hamsters eat approximately 12 grams of food daily, and usually consume the majority of this at night. Hamsters are like little pack rats that often hoard their food in a corner of their cage, making it seem as though they eat a lot more than they really do.
Water is easily provided in water bottles equipped with sipper tubes. This method also helps keep the water free from contamination. Always make sure that the tubes are positioned low enough to allow the pet easy access. Juvenile hamsters need special consideration to make sure they are strong enough to use the sipper tube as well as reach it. The average hamster drinks approximately 10 ml of water per 100 grams body weight (average adult size). Although this amount is only a fraction of the total bottle volume, fresh water should be provided daily, not only when the bottle empties.
Diseases
Proliferative Ileitis ( Wet Tail )
The most commonly encountered bacterial infection recognized in hamsters is 'wet tail'. The precise cause of the disease is not fully understood, but underlying infections with the bacteria Campylobacter fetus subspecies jejuni have been reported. Similar Campylobacter sp. are responsible for serious intestinal diseases in other animal species, such as swine, dogs, ferrets, primates and even humans. Although this agent is suspected to be an underlying cause of this syndrome, pure cultures of the bacteria cannot reproduce the disease, suggesting other predisposing factors or agents. Such contributory factors include improper diet, sudden dietary changes, overcrowding and other stresses.
This disease most often affects weanling hamsters between the ages of 3 to 6 weeks, but hamsters of all ages are susceptible. Since this is the age at which most hamsters are sold, this is a common disease encountered in recently acquired pets. The long haired 'teddy bear' hamster seems to be more vulnerable than the other varieties.
Death may result within 1 to 7 days after the onset of watery diarrhea. Other signs include matting of the fur around the tail, unkept hair coat, hunched stance, loss of appetite, dehydration, emaciation and irritability. Blood from the rectum and rectal prolapse may be noted in some serious cases. This is a very serious disease, with death being the most likely outcome. Due to the severity, any hamster exhibiting these signs must be examined by a veterinarian as soon as possible. Antibiotics, fluid therapy and anti-diarrheal medications will be administered to the patient. Supportive care will also be instituted. Despite all the best efforts, treatment is often unrewarding with death occurring within a couple days in many cases.
Hair Loss ( Alopecia )
Hair loss can occur for a number of reasons in hamsters. This loss of hair can be due to both disease and nondisease conditions. Continual rubbing on feeders or sides of the cage as well as protein deficiency and barbering (hair chewing by cage mates), are examples of nondisease causes of alopecia. Infestation with demodectic mites is one of the most common infectious causes of patchy alopecia and scaling in hamsters. Other conditions that lead to hair loss include adrenal tumors, thyroid deficiency, and chronic renal disease. Some of these conditions may be correctable, while others are not.
Demodex mites are the most common external parasite causing problems in hamsters. The mite lives within the hair follicles and certain skin glands of their host. The presence of these mites result in dry, scaly skin and subsequent hair loss, especially over the back and rump. This disease is rarely a problem by itself. Demodectic mange in hamsters is often associated with chronic, debilitating diseases or other underlying problems. For this reason, a thorough examination must be performed on any hamster presented with mites. To confirm the presence of mites, the veterinarian may perform a skin scraping for microscopic observation. Treatment for the mites is often possible, but remember that there may be another problem, often more severe, underlying this one which must also be addressed.
Old Age Diseases ( Geriatric Conditions )
Hamsters tend to have relatively short life spans when compared with other species. The average life expectancy of a hamster is between 2 and 3 years of age. For this reason, spontaneous aging diseases are not uncommon in these animals, typically after the age of one year. Two of the most common geriatric diseases of hamsters are amyloidosis (protein deposition in various organs) and cardiac thrombosis (blood clots in the heart). Treatment of these conditions involves managing clinical signs because a cure is not possible. A diagnosis of virtually any geriatric disease carries a poor prognosis.
Amyloidosis is a condition whereby proteins produced by the body are deposited in various organs, primarily the liver and kidneys. Kidney and liver failure often occurs as a result of this protein deposition. Many other organs are also affected, and the changes are irreversible. Signs of this condition include swollen abdomen, urinary problems, dehydration, poor appetite and rough hair coat. Supportive care is the only treatment since this condition is eventually terminal.
Blood clots within the heart occur at a relatively high frequency in older hamsters. This condition is known as cardiac thrombosis, and typically occurs in the left side of the heart. Many factors are involved in the formation of these clots including clotting disorders, heart failure, circulating bacterial infection and amyloidosis. Many other old age diseases occur in hamsters over the age of one year. Liver and kidney disease is not uncommon in middle age to old hamsters. Other conditions commonly encountered are gastric ulcers, tumors, and dental diseases.
Facts
Handling
Hamsters handled frequently from a young age usually remain docile and seldom bite. These animals of a docile nature can be picked up gently by cupping in one or both hands and held against one's body. Beware that even docile hamsters may bite if surprised or abruptly awakened from sleep.
Other hamsters, however, may not have received a lot of attention and handling throughout their lives, and thus may be more apprehensive and aggressive. Any animal whose personality is not fully known must be approached cautiously. The use of a small towel or gloves can assist the handler in capturing and restraining such a pet. Another method of capture involves coaxing the animal into a container (such as a can or tube), which can then be removed from the cage. Once removed from the cage, biting hamsters can be restrained by grasping a large amount of skin at the scruff of the neck. As much skin as possible must be grasped using this method because their skin is very loose. If lightly scruffed, the hamster can easily turn around within its skin and bite the handler.
Housing
Several types of cages are available that are suitable for housing hamsters. Many of these units come equipped with cage 'furniture' such as exercise wheels, tunnels and nest boxes as added luxuries. Such accessories, as well as sufficient litter depth within which to burrow, are desirable for the pet's psychological well-being. Cages should be constructed with rounded corners to prevent chewing. Hamsters will readily chew through wood, light plastic and soft metal; so recommended caging materials are wire, stainless steel, durable plastic and glass. Beware that glass and plastic containers drastically reduce ventilation and can lead to problems with humidity, temperature and odor concentration. These materials make suitable cages when at least one side of the enclosure is open for air circulation. In addition, make sure that the enclosure is escape proof, because these little rodents are known escape artists.
Hamsters do very well in solid bottom cages with deep bedding and ample nesting material. Bedding must be clean, non-toxic, absorbent, relatively dust free, and easily acquired. Shredded paper or tissue, wood shavings and processed corn cob are preferred bedding. Be sure that the wood shavings and ground corn cob are free from mold, mildew or other contamination before using. Cotton and shredded tissue paper make excellent nesting materials.
Adult hamsters require a minimum floor area of 19 square inches and a cage height of 6 inches. Female breeding hamsters require much larger areas. Optimal temperature range for hamsters is between 65o to 80oF, with babies doing best at 70o to 75oF. The relative humidity should be between 40% and 70%. Twelve hour light cycles are preferred, with hamsters being more active during the night.
Pet hamsters are generally housed singly. Mature female hamsters tend to be very aggressive towards one another and should never be housed together. Females are also larger and more aggressive than males, thus males usually need to be separated immediately after breeding. Males may also fight when housed together, but tend to be less aggressive than females.
As a rule of thumb, the cage and accessories should be cleaned thoroughly once to twice weekly. An exception to this schedule is when newborn babies are present; wait until they are at least two weeks old to disturb the cage. Other factors that may require increased frequency of cleaning are the number of hamsters in the cage, the type of bedding material provided, and the cage design and size. Cages are sanitized with hot water and nontoxic disinfectant or detergent, then thoroughly rinsed. Water bottles and food dishes should be cleaned and disinfected daily.
Reproduction
The sex of hamsters can be easily determined. Mature male hamsters possess large, prominent testicles, which often alarm owners who first notice their size and mistake them for tumors. In addition, the genitourinary to anal separation is much wider in males than females, making it possible to sex young hamsters.
Male hamsters should be first bred at 10 to 14 weeks of age. Females can be bred at the age of 6 to 10 weeks. As the female comes into 'heat' she will begin assuming a breeding stance with her back swayed and body stretched out. When petted over her back, she will remain motionless and sway her back even further. A thin mucus will be noticed coming from her vulva on the next day of the 'heat' cycle, which indicates that estrus will occur two days later. For breeding, place the female into the male's cage about one hour before dark. Closely observe the pair for mating activity or fighting. Females can be very aggressive towards males and can cause serious injuries. At the first sign of aggression by the female, remove the male; then try again the next night. Also, remove the male shortly after a successful mating has taken place.
Pregnancy is of very short duration in hamsters; lasting only 15 to 16 days. Just before delivery, the expectant mother will become restless and may discharge a small amount of blood from her vulva. Do not handle or disturb her at this time. It is wise to clean her cage two weeks following breeding, so her cage is relatively clean when babies arrive. Litter size ranges from 5 to 10 pups; larger litters are not uncommon. The pups are born hairless with their eyes and ears closed. However, they do already have their front teeth, the incisors.
Provide ample nesting material and bedding for the new mother and young. Plenty of fresh food and water should be available before the babies are born. DO NOT disturb the mother and young for any reason during the first week or two after birth. If a mother hamster seems threatened for any reason, she typically will kill and cannibalize the young. In other instances, she may stuff the young into her cheek pouches and frantically carry them around the cage looking for a safe place to establish a nest. Occasionally, pups will suffocate as a result of this activity, especially if the disturbance is prolonged.
Young hamsters usually begin eating solid food at 7 to 10 days of age, but are not weaned until 21 to 25 days. Provide food on the cage floor for the young and mother, and also have soaked, softened pellets available for them as well. Make sure that the water bottle is low enough for the weanlings to use, and that they are strong enough to use it; or provide an alternative water source during this time.
Proof of the gay-linux conspiracy!
How long until we have instructions on how to make a Holodeck?
uh oh....
HOW TO MAKE IT WITH HAMSTERS
Introducing the most powerful system ever for being successful with
hamsters! Are you fed up with seeing pretty rodents scampering by and
not knowing what to say to them? Do you wish you could walk up to ANY
hamster you choose and set a date?
Well now you can! "How To Make It With Hamsters" is a fantastic new
course that will show you everything you need to know to turn you from
a shy ordinary guy into a highly successful rodents man - guaranteed.
Includes such topics as:
- Opening lines that work like a dream,
- A simple rule that will double your number of pets,
- How to instantly become more attractive to small mammals,
- Be confidant and at ease in any situation,
- How to get hamsters to pick you up!
- How plain men can easily get dates with gorgeous gerbils,
- How to make hamsters fancy you without even trying,
- How to maintain an amazing and enviable pet life,
- And much much more.
Everything contained in this course has been proven in real life
situations and works like magic. Just listen to what some of our
previous customers have to say (copies available on request):
"I can't believe how effective your course really is, the information
in here is dynamite. Hamsters just love me and a can't do a thing
wrong."
"It's amazing, I'm now going out with the hamster I've always fancied
but before now never dared to ask. Thank you so much."
"Before learning your techniques I had tried everything on the market
to make me more successful with rodents - but nothing seemed to work.
Now things couldn't be better and I see a different species every
night of the week."
Proof of the gay-linux conspiracy!
Laser pointer holography was originaly developed by Frank DeFreitas. His web site http://www.holoworld.com/holo/diode.html has many pictures of his work. Quite a marvel. You should buy his book. It is very informative. It's about 17 bucks from Amazon.com Its very helpful and takes you step by step in the process and a bit into the history of holograms etc. I'be had great success with his process. It's a bit harder to find his holographic plates, and this isn't exactly the cheapest thing in the world. The plates cost me US$60 for five or six! But the results are great. You CAN'T use this for any kind of forgery because the holograms are on a glass substrate. I suppose it is possible to put it on plastic somehow. But beats me on how to do it.
W-S
Good job being able to type with one hand up your ass. I know when I'm self-fisting, I have to peck at the keyboard with a pencil in my teeth, because I'm furiously whacking off with my other hand.
C - A language that combines the speed of assembly with the ease of use of assembly.
It was really quite interesting to setup. The ones we made turned out so-so. The problem was the only room that we had to create the holograms in was on the 2nd floor of the house. So all kinds of vibrations from below caused some problems.
If ur going 2 do this urself, I'd advise setting up the project in a school's darkroom or janitor's closet with a cement floor.
Make sure ur far away from streets and all forms of noise (and therefore vibrations) as this REALLY causes problems.
FLXkid (the Visual Dataflex Guru)
...
Better VDF than VD!
Better VDF than VD...check it out: Data Access
What? Out of 20 posts. 2 are non-troll?
...... and 2 of those non troll posts are fuckin useless to read anyway.
First 8 responses were posted by trolls. They're hitting refresh every 5 seconds, waiting for a new story...and they call us losers? haha!
The laser pointer they used has a 650 nm laser...hmmm.
Wonder what a hologram of a DVD would look like, given that 4.7 GB DVD-R discs use 650 nm lasers in the recording process?
"Evil will always triumph because good is dumb." -- Dark Helmet
Gotcha!
Go Kathryn Thurber!
...not even Star Trek has hologram generators the size of a pen. }}}:-) What? What, you say? They're not that kind of hologram? Well, shit. :D
Pain(n): when you're telnetting into a box doing somethin cool, and some luser calls for help with a 'critical error' ad
haha!
-A. Troll
This is been done for years now. A couple of links. Check the dates. http://www.3dimagery.com/pointer.html http://www.holoworld.com/holo/diode.html Tim Massey Don't say I never gave you anything
Linux IT Consulting and Domino Development in Michigan
I actually went to a little seminar one day at the MIT Media Lab where we did this. It was really cool. You can make much more impressive holograms with the right equipment, but the fact that you can do it with a laser pointer and not this expensive monster of a laser is really neat
of who can link the most websites about holograms...cause i just won!
The holoshop
another page
yahoo group on holography
the big holobook
how to shoot holograms
holoworld
silver holographic
holophile
the last one but a good one
Man: Is your uh, is your wife interested in....holography, ay? 'Holographs, ay', he asked him knowingly?
Squire: Holography?
Man: Snap snap, grin grin, wink wink, nudge nudge, say no more?
Squire: Laser pointer diodes, eh?
Man: They could be, they could be taken with diodes. Candid, you know, CANDID holography?
Squire: No, no I'm afraid we don't have a laser pointer.
I watched C-beams glitter in the dark near the Tannhauser gate.
know what i mean? know what i mean?
I wonder if I could get my cd mavica to do that?
- Kaos games and encryption systems developer
The only catch is that these holograms are only visible at a very narrow range of angles. Not just the two angles of rotation to your eye, but also the two angles of rotation to the point light source. So it can take a bit of fiddling before you suddenly see something. But when you do, it's very sharp and detailed.
Slashdot monitor for your Mozilla sidebar or Active Desktop.
When I read that parent post, my first thought was "Hey when is Ralph Nader going to bite on this." I'm very pleased he didn't disappoint.
C - A language that combines the speed of assembly with the ease of use of assembly.
Those laser pointers you can get with with switchable tips that cause the device to project different 2D images (by multi-slit-diffraction, I suspect) can be fun. One time I was in a hotel up on the tenth floor and I had just bought one of these toys.
... fun!
[Side note: yes, I know this is somewhat off topic, but this thing I'm about to tell you could have amplified effect with 3D projections.]
I stuck on the tip which projected a 'UFO' image, stepped out onto the balcony and shone it onto the ground. I moved it around and after a few seconds I heard some little girl scream "MOMMY!" so then turned it off. Imagine what you could do with one of these things projecting the right 3D image
My father was playing with holograms with a home made HeNe laser about 20 years ago I think.
At the time I didn't understand much of the process but I remember he had to borrow a street level place in a low traffic area and had to place the working plane on a stack of strange things such as buckets of sand and tires' inner tubes.
Doesn't sound too professional but might still work.
baubau
I wet myself in a diaper
That I can finally custom-make my holo-friend? I've always wanted a friend, but hologram technology hasn't caught up with my needs. Geeks have needs, too!!!
Im bit confused on those two:
holograph - the 3d image on credit card
hologram - projected 3d image in space
Did i get it right, or is it the other way around?
I just go to Slashdot and there it is! The covetted first post, just waiting for me with its legs spread wide like the whore it is. How can I not resist sticking it in?
C - A language that combines the speed of assembly with the ease of use of assembly.
is this going to be a contest (Score:0, Flamebait)
by Anonymous Coward on Saturday December 29, @10:11PM (#2763836)
of who can link the most websites about holograms...cause i just won!
The holoshop [holoshop.com]
another page [holograms-online.co.uk]
yahoo group on holography [yahoo.com]
the big holobook [shadow.net]
how to shoot holograms [imagesco.com]
holoworld [holoworld.com]
silver holographic [silver-holographic.com]
holophile [holophile.com]
the last one but a good one [come.to]
[ Reply to This | Parent ]
Moderation Totals: Flamebait=1, Informative=1, Total=2.
I'd probably be the smart ass that would creat a hologram of the windows 2000 cd.
(you know, the one with the hologram on it?)
Would that be like putting mirror in front of a mirror?
Anywho, off to bed....
.
Have you read the moderator guidelines? Well, have you, PUNK? (and I want a Karma: Gnarly option)
HA! I'd like to see them extract royalties while I exercise my cat on Sealand!
...Yet another thing those annoying teenagers can do with this annoying pointers at the movie theaters...
When will those guys STOP?!?!
Get a used HeNe laser off ebay or any Optics surplus, with TEM00 properties (which means the laser is coherent... needed for holography, and you'll be able to make some holograms that have more than a few millimeters of coherence (hense, depth).
:), yeah sometimes it's that crazy, I tried :) ).
Laser Diodes holography really sucks, it's pricey for the result you get, learn the thing with the right basic parts. If you're ready to invest let's say 400$ worth of chemicals films and all, with the idea of doing more in the future, might as well invest in the proper "amateur equipment"
Also: High power laser diodes in a decent spectrum (630-640nm) aren't THAT powerful, or if they are, (more than 5mw) they are pricey. These laser diodes lacks coherence (notice how close are the object from the plates). Without coherence, you don't get depth, without power, you have more chances that your object might move (if the object moves just a quarter of the wavelength, it screws up the hologram), so getting a cheap used 20mW HeNe laser gives you the benifit of power (you won't make a 8x10 with that, unless you have a really stable environment that can take 30+seconds exposure time depending on the object, of course doing the hologram of a fruit might not work too well with that much exposure because only the "fermentation" of the fruit over 30 seconds changes the structure in the nm scale
The only downside of Gas lasers is their lifespan. You can be lucky and it would last for 3-4 years, like you can get one that will last for 6 months, depends on the manufacturer, prices, condition. Normally they give you the tube usage and lifespan. Also, it requires high voltage power supply, which isn't a problem for the low power heNe lasers (under 30mw at the output).
Holography is cool, but it takes patience, a lot of trial/error, and when you want to move a step further, it takes as much money than doing high-end photography (with all the optics and chemicals).
--- Metamoderating abusive downgraders since my 300th post.
When I was a kid (or was that a teenager?) I used to draw (simple) 3D images with red and blue pencils and then view them thru those silly red-and-blue 3D movie glasses.
It is easier than the arc-scratch technique, but requires the funny specticles. Trade-offs trade-offs. But, red-and-blue gives more instant gratification.
My fav was the Dolly Parton sketch.
Hey! Can I patent a new way to hide porm from the mom? Beats one-click shopping.
Table-ized A.I.
www.photologie.net has a geat walkthrough for laser pointer holograms with lots of pictures.
It covers adding more power to the pointer as well and some details for opening the caseing without damageing it.
Bust out your Dremel tool and potentiometer, and use the fish cuz its in French.
Yeah I agree. He was one of the good guys. It was tragic, he left us with alot of great music. Hail Victory Ian!
To get this through the slashdot junk filter, view the HTML source and copy and paste it from there, not from the browser. This work of art (author unknown, but source is http://goatse.cx/contrib.html) uses special HTML code, devised by a hardworking genius (Klerck?), to get through the junk filter.
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I use Windows XP Corporate Professional (because Linux is for fags and overidealistic groupthinking kiddies), so I use wordpad since it doesn't reformat my text like notepad does.
Calling all trolls: before they figure out how to fix it, POST THIS GOATSE IMAGE EVERYWHERE! Extra points are given for linking the entire image to to hello.mpg as I have done.
Thank you and pwaise Jesus!
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In a similar vein, I've spent the past week or two trying to develop a way to produce seamless, stereoscopic 3D desktop backgrounds. I've always had an interest in stereography, but until now I couldn't find a way to apply it to my PROPAGANDA tiles..
Just yesterday morning I finally managed to produce (and can reproduce at will) stereoscopic 3D wallpaper in Gimp. No rendering, no photography, nuthin but pure hand-made goodness in Gimp.
Cheers,
Bowie J. Poag
If you built yourself 2 nitrogen lasers (produce UVA light) and you pumped high voltage electricity into them, you will have an electric beam that will shoot a few hundred yards.
It works because the intense UV light from the laser ionizes the oxygen in the air. Ionized air is more conductive of electricity. The high voltage electricity shoots down the path of the laser beams.
You have to have two laser beams to have a complete circuit. If you shot this at a deer or somthing, the electricity would travel down one beam, pass through the deer's central nervous system, and pass back out on the other beam.
BTW, you could set it from "stun" to "kill"
Also there is quite a few people who build nitrogen lasers. Its not hard.
If you don't understand any of my sayings, come to me in private and I shall take you in my German mouth.
now you can not only make a copy of the latest version of microsoft windows on a cdr, but you can use your warez versions of photoshop and pagemaker to print boxes and labels and make a nice little microsoft hologram logo for them to complete the look. neato, hehehe. =)
laser painted holloman
It's psychosomatic. You need a lobotomy. I'll get a saw.