Laser We have all seen, or heard of, small to toy games, large to industrial equipment and laser weapons, which are derived from the size of different, strong and different degrees of laser launcher composition. Even the weakest laser is stronger than the sun's light, why?
The difference between sunlight and laser light
Each color of light has a different wavelength. As shown in the figure below, blue light has a shorter wavelength than red light. Sunlight is made up of light with many different wavelengths, and our eyes perceive this mixture of wavelengths as white light.
The wavelength of the laser is different from that of the sun, and the laser does not occur naturally, it is invented by man. The laser produces a narrow beam in which all of the light waves have very similar wavelengths (shown below). So that's why laser beams are very narrow, very bright and can focus on very small spots and are stronger than sunlight.
How does laser light shine
Lasers come in many colors, and a typical red laser will contain a long crystal (medium) made of ruby and wrapped around it with a flash tube. The flash tube looks a bit like a fluorescent lamp, but it is coiled around a ruby crystal and emits the same wavelength of light, and these flashes of light at the same frequency are lasers.
The high voltage power supply causes the tube to flicker. Each time the tube flickers, it "pumps" energy into the ruby crystal so that the energy is injected into the crystal in the form of photons. The atoms in the ruby crystal (large green spots) absorb this energy through an absorption process. An atom's electrons absorb energy as they transition to higher energy levels. After a few milliseconds, the electron returns to its original state by emitting photons (small blue specks). This is called spontaneous emission. Photons emitted by atoms zoom up and down inside the ruby crystal, traveling at the speed of light. Each of these photons excites another already excited atom. When this happens, the excited atom releases a photon, and we bring the original photon back with us. This is called stimulated emission. The nail mirror at one end of the laser tube keeps the photons bouncing back and forth within the crystal. A mirror at the other end of the tube reflects some photons back into the crystal, but lets some of them escape. The escaping photons form a very concentrated laser beam, which forms the laser we see.
The use value of laser
The products we use that contain lasers are usually limited to laser printers, barcode scanners and DVD players. It is also used in precision tools that can cut diamonds or thick metals, as well as laser scalpels that have been designed for delicate use.
Lasers are also used by scientists to measure the distance between the Earth and the moon by measuring the time it takes the laser beam to reach and return to the moon.
Due to the variable nature of laser gain, as long as you can make a large enough laser launcher, the energy of the laser will increase, just like some laser weapons do not cost a shot, can use the laser on the ground to destroy the aircraft in the sky. Of course, this huge exciting device is the most expensive electricity, the greater the energy of the laser consumes more electricity, so the average person even if you can make it, and can't pay the electricity bill.