The darker the hair, the more it represents the ideal target, thus potentially destroying it completely. So for blond, red or white hair, the laser will have no effect and thus will be strongly discouraged, and good green laser pointer centers will refuse to do so for lack of results. Professional laser diode systems are usually equipped with a 638nm red laser. We use this type of diode in our professional laser systems. Most Chinese manufacturers cannot handle this type of diode.
In it, they simulated the depth of absorption of lasers from 308nm to 635nm and the wavelengths that penetrate the laser, showing that the red laser pointer is absorbed at about 1/7 the speed of ultraviolet light, thus allowing depths up to five times as deep. On the other hand, once you go beyond the red region and into the near-infrared region of the spectrum, the energy of the photons decreases further, but as shown in the graph below, the absorption by lipids and water starts to increase. Would you like to buy a laser pointer for a presentation? When I put it down, one of the handles came off. I wanted to return them, but when we got home, the time had passed. But for camping trips, these are perfect. These two elements will bring a lot of light into your campsite and tent! They come with batteries, just pull the cord and they work instantly, very shiny! Plus, I love their tacky look.
These have a very good visible red color and can be collimated into a good beam shape. The handling of such diodes is very delicate, especially if more than two diodes need to be combined. The principle of high power laser pointer drilling is to use a laser beam to collect the focused temperature of the metal surface to make it rise rapidly, and the temperature rise can reach 10 million degrees per second. When the heat has not dissipated, the beam burns the metal until it evaporates, leaving a small hole. Laser drilling is not limited by the hardness and brittleness of the material to be processed, and the drilling speed is extremely fast, so the drilling can be completed in a thousandth of a second or even a millionth of a second.