Learn about laser pointers and their use
Laser pointers will not affect your vision because they do not pass through the lense. The lense determines the loss of vision. Your friends' pointers are not powerful enough to damage tissue. It would take a laser much stronger than a pointer.
Frequency doubling is the primary method of making laser diodes. It appears that current green and blue lasers are made. The frequency is doubled by pointing an infrared laser beam through a crystal. The output beam would be green or blue at 532 nm if the IR is 1064 nm. Extra crystals are the reason for the higher price.
I don't understand why the normal green led technology hasn't been used to make green pointers. Maybe no one has yet perfected the technology in a small package. Laser diodes, however, are made from materials with an inherent "energy bandgap" that determines the wavelength emitted by the laser. Other materials have a wider bandgap but not enough for the laser to be tuned over multiple colors. Visit website to know how does a laser pointer work
Are laser pointers that are used for school and business presentations dangerous to the eyes when they are pointed at them directly? Does the answer differ depending on whether we are talking about dogs, cats or humans? These lasers do not pose a danger to humans or large animals. The beams are not precise and their power is low. It is the beam shape that makes scientific lasers with similar power levels more dangerous. The focus of a well-shaped beam is much smaller than that of an irregular beam.
You will still see stars when you stare directly at the beam. It is similar to looking at the sun, which is also dangerous, mainly for its UV and IR light. A device called an optical parameter oscillator can increase the wavelength. Reduce the frequency of a Laser. You can increase the frequency by, for example. You can reduce the wavelength by pumping another laser.
Does this device work well with a laser? I'd rather add something at the end than mess with the internal components. The laser pointer would be used as a pump to power the laser that you would need to build outside of the laser. You don't need to disassemble the laser pointer, but you will need some advanced optics. The green laser pointers available commercially use a red light to pump a green laser. They are two lasers combined into one device.
I wanted to buy a laser pointer in blue, but the only people who had the technology and patent to make them were a few select individuals. This would mean that a laser pointer of this type would cost around $1,000. Green laser pointers are about $100 and red ones, which are more common, cost at most $20. Why is there such a huge difference in price between the two? What is a diode and why is it so difficult to manufacture?
It will take a while before you can buy a blue laser pointer. It's quite simple. Red laser diodes have been around for 15 years. Green laser diodes have been around for 5 years, while blue laser diodes are relatively new. As with DVD writers, flat screen TVs and other new products the prices drop dramatically over time. This is mainly because one company has a patent and can do whatever it wants. The price drops when the patent expires or an alternative technology is developed.
Making diodes is not difficult. The hard part is figuring out how to do it, what semiconductor materials are needed, the deposition process, and heat-sinking. As I mentioned, some laser pointers may cause some damage to your eyes. If you are interested in getting one or making one, please do not point it directly at someone's eyes. You may have friends who point lasers at your eyes, thinking it's funny. It's not. Wrongs do not make right. Show them that you're more mature.