The Cat eShack

Beam Laser cat

All About Laser Pointers And Their Use

A laser will go through the lense of the eye without having any effect, and the lense is what determines vision loss, so laser pointers are not likely to affect your vision. It takes a powerful laser, much more powerful than a pointer, to affect tissue so I don’t think your immature friends have done you any harm.

It looks like current green and probably blue, laser diodes are made primarily by frequency doubling. Frequency doubling means that an infrared beam is pointed through a crystal which causes the frequency to double. If the IR beam is 1064 nm, the output beam will be 532 nm green or blue. The extra crystal is the cause of the extra price.

I don’t know why normal green led technology isn’t used for green pointers. Perhaps no one has perfected it in a small package yet. Anyway, laser diodes are made of materials that have an intrinsic “energy bandgap,” which determines the wavelength of light emitted from the laser. Some materials may have a broader bandgap, but not enough to tune the laser over multiple colors.

Those laser pointers used in business presentations and school lectures–is there any danger to the eyes if they are pointed directly? And does the answer change depending upon whether one is talking about humans or dogs or cats, for example? No, those lasers are not dangerous to people or any large animals. Their power is firly low, and the beam is not very precise. The beam shape is a primary factor which makes similar-powered scientific lasers more dangerous. Well-shaped beams can focus to a much smaller spot than irregular beams.

All the same, you will see stars if you look at the beam directly. The brightness level is not too different from looking directly at the sun ,which is dangerous for other reasons, mainly unseen UV and IR light. There is a device called an optical parametric oscillator that can increase the wavelength, i.e. reduce the frequency of a laser. If you want to increase the frequency, i.e. reduce the wavelength of a laser, this can be achieved by using the laser to pump another laser, a dye laser for instance.

Would this device work with a laser pointer? I would like to add something to the end of it rather than mess around with the internal parts. You would use the laser pointer as a pump for the laser you would have to construct outside the laser pointer. No need to take the laser pointer apart, but you would need to build some sophisticated optics for this. Actually the green laser pointers that are commercially available use a red laser to pump another laser, this time green. So they are actually two lasers in one device.

I’ve been wanting to buy a blue laser pointer but found that the only ones with the technology to create them and who hold the patent are a select few so any such laser pointer would cost someone about $1,000. Green laser pointers cost about $100, and the common red ones cost maybe $20 at most. Why the extreme difference in price? What are these diodes and why are they so difficult to make?

You will have to wait a little while to buy a cheap blue laser pointer. The reason is quite simple. Red laser diodes were invented 15 years ago. Green laser diodes were invented 5 years ago, and blue laser diodes were invented last year. Similar to DVD writers, flat-screen TVs, and other new products, the price drops dramatically as time passes. Mainly, this is because one company owns a patent at first and can chjaarge whatever they want. When the patent expires, or alternate technology is invented, the price comes down.

There is nothing particularly difficult about making the diodes. Figuring out how to make them, which semiconductor materials, deposition, heat-sinking, is the hard part. But like I said some of the laser pointers can cause a little harm to your eyes, so if you want to get one or make one, make sure that you don’t point it at anyones eyes. Even though you have friends that point there lasers in your eyes thinking that it is funny, which it isn’t, to wrongs don’t make a right. Just show them how more muture you are.

About the Author

Victor Epand is an expert consultant for http://www.PCSupplies.info/. PCSupplies.info carries the best selection of computer accessories and PC supplies on the market. Start shopping by category here: http://www.PCSupplies.info/menu/category.html.

Christmas Laser Beam Cats

Bada Beam Laser Cat Toy – Laser Toy $12.99 Your cat will love chasing this automatic laser beam that circles, pauses, then continues circling again. Top lid can be adjusted to aim the laser at a wall or at the floor. The laser will automatically shut off after 15 minutes to conserve battery life. 3 AA batteries are included. Unit measures 4 1/4″ by 5 1/2″.

Ba Da Beam Rotating Laser Cat Toy $25.48 The Ba Da Beam Rotating Laser Cat Toy by MultiPet is simply the most amazing, mesmerizing cat toy ever! Just put it on the floor, open the lid to aim at the floor or wall, look out. Your cats will be swatting away frantically, chasing and jumping five feet in the air as the laser races up and down. Cats simply never tire of the Ba-Da-Beam’s automatically moving, stopping and spinning laser. Perfect for times when catnip mice and crinkly balls are just too dull for your jaded pet. These laser light toys are sure to pique your pet’s interest in play. 3 AA Batteries included!

Zanies Laser Beam Mouse Cat Toy $5.97 Powerful laser projects up to 160 feet. Fun mouse shape complete with wiskers. Handy keychain attachment. Challenge your cat to an exciting game of chase! Zanies Laser Beam Mouse projects a powerful beam for hours of play and can be hidden in the palm of your hand, adding intrigue to this interactive game of pursuit. Batteries included. Type: Lasers

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Beam: The Race to Make the Laser $53.68 In 1954, Charles Townes invented the laser’s microwave cousin, the maser. The next logical step was to extend the same physical principles to the shorter wavelengths of light, but the idea did not catch fire until October 1957, when Townes asked Gordon Gould about Gould’s research on using light to excite thallium atoms. Each took the idea and ran with it. The independent-minded Gould sought the fortune of an independent inventor; the professorial Townes sought the fame of scientific recognition. Townes enlisted the help of his brother-in-law, Arthur Schawlow, and got Bell Labs into the race. Gould turned his ideas into a patent application and a million-dollar defense contract. They soon had company. Ali Javan, one of Townes’s former students, began pulling 90-hour weeks at Bell Labs with colleague Bill Bennett. And far away in California a bright young physicist named Ted Maiman became a very dark horse in the race. While Schawlow proclaimed that ruby could never make a laser, Maiman slowly convinced himself it would. As others struggled with recalcitrant equipment and military secrecy, Maiman built a tiny and elegant device that fit in the palm of his hand. His ruby laser worked the first time he tried it, on May 16, 1960, but afterwards he had to battle for acceptance as the man who made the first laser. Beam is a fascinating tale of a remarkable and powerful invention that has become a symbol of modern technology.

Green Beam Laser Pointer $18.99 High-quality green laser pointer. Great for business presentations, academic lectures, speaking engagements, etc. Low power consumption. Powered by 2 AAA batteries (not included). Wavelength : up to 533 meter Dimensions : 13mm x 160mm

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International Symbols Labels – Laser Beam $13.7 International Symbol Labels have internationally recognized graphics to communicate warnings . The International Organization of Standardization’s system of recognizable safety information graphics communicates hazards and actions without the need for words Self-adhesive vinyl labels are available in 1-1/2″, 2-1/2″ or 4-1/2″ triangles and come in packages of 5 Label has “Laser Beam” International Symbol

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Gaussian Beam $95.59 High Quality Content by WIKIPEDIA articles In optics, a Gaussian beam is a beam of electromagnetic radiation whose transverse electric field and intensity distributions are described by Gaussian functions. Many lasers emit beams with a Gaussian profile, in which case the laser is said to be operating on the fundamental transverse mode, or TEM00 mode of the lasers optical resonator. When refracted by a lens, a Gaussian beam is transformed into another Gaussian beam, which explains why it is a convenient, widespread model in laser optics. The mathematical function that describes the Gaussian beam is a solution to the paraxial form of the Helmholtz equation. The solution, in the form of a Gaussian function, represents the complex amplitude of the electric field, which propagates along with the corresponding magnetic field as an electromagnetic wave in the beam. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 156 Publication Date: 2010/06/27 Language: English Dimensions: 5.98 x 9.01 x 0.36 inches

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Laser Beam Shaping: Theory and Techniques $233.95 No Synopsis Available

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Laser Ablation $74.88 High Quality Content by WIKIPEDIA articles Laser ablation is the process of removing material from a solid (or occasionally liquid) surface by irradiating it with a laser beam. At low laser flux, the material is heated by the absorbed laser energy and evaporates or sublimates. At high laser flux, the material is typically converted to a plasma. Usually, laser ablation refers to removing material with a pulsed laser, but it is possible to ablate material with a continuous wave laser beam if the laser intensity is high enough. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 96 Publication Date: 2010/10/01 Language: English Dimensions: 6.00 x 9.02 x 0.23 inches

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