The laser goes through the lens of the eye without any effect, and this lens determines vision loss, so a laser pointer will not affect your vision. It takes a strong laser, is much stronger than a pointer, to affect the network so I don’t think your friends who are immature have harmed you.
It looks like the current green and maybe blue, the laser diode is made mainly by twice the frequency. Frequency multipliers mean that infrared rays are directed through the crystal which causes a doubling frequency. If the IR beam is 1064 nm, the output beam will be 532 nm green or blue. Extra crystals are the cause of extra prices.
I don’t know why ordinary green led technology is not used for green pointers. Maybe no one has perfected it in a small package. However, laser diodes are made of materials that have an intrinsic “energy band gap”, which determines the wavelength of light emitted from the laser. Some materials may have a wider band gap, but not enough to adjust the laser to many colors.
Laser pointers are used in business presentations and lectures at school – is there a danger to the eye if they are directed directly? And does the answer change depending on whether someone talks about humans or dogs or cats, for example? No, the laser is not harmful to humans or large animals. Their strength is very low, and the beam is not very precise. File format is the main factor that makes similarly powered scientific lasers more dangerous. A well-shaped beam can focus to a place that is much smaller than an irregular beam.
All the same, you will see stars if you see the light directly. The brightness level is not too different from looking directly into the sun, which is dangerous for other reasons, especially UV and IR that are not visible. There is a device called an optical parametric oscillator that can increase the wavelength, which reduces the frequency of the laser. If you want to increase the frequency, which is to reduce the laser wavelength, this can be achieved by using a laser to pump another laser, for example, a dye laser.
Does this device work with the laser pointer? I want to add something to the end rather than tinkering with the internal part. You will use a laser pointer as a pump for a laser you must build outside the laser pointer. There is no need to take a laser pointer, but you need to build some advanced optics for this. Actually green laser pointers are commercially available using red lasers to pump other lasers, this time it’s green. So they are actually two lasers in one device.
I have long wanted to buy blue laser pointers but found that the only thing with the technology to create them and who holds a patent is a select few so that a laser pointer like that will cost someone around $ 1,000. Green laser pointers cost around $ 100, and the common red costs may reach $ 20 at most. Why is the price difference extreme? What are these diodes and why are they so difficult to make?
You have to wait a while to buy a cheap blue laser pointer. The reason is quite simple. Red laser diodes were discovered 15 years ago. Green laser diodes were discovered 5 years ago, and blue laser diodes were discovered last year. Similar to DVD writers, flat-screen TVs, and other new products, the price drops dramatically over time. Especially, this is because one company has a patent at first and can chzeb some they want. When the patent ends, or alternative technology is found, the price will drop.
Nothing is very difficult in making diodes. Finding out how to make them, which are semiconductor materials, precipitation, heat-sinking, is a difficult part. But like I said some laser pointers can cause a little damage to your eyes, so if you want to get one or make it, make sure you don’t point it into someone else’s eyes. Even though you have a friend who shows a laser in your eyes thinking that it’s funny, that doesn’t, mistakes don’t make rights. Just show them how you mutate more.