Classification of lasers

The laser can be divided into visible light, infrared light, ultraviolet light, X-ray light, multi-wavelength tunable light, and currently used in industrial infrared and ultraviolet lasers. Such as CO2 laser 10.64um infrared laser, Xenon-pump YAG laser 1.064um infrared laser, Xenon-pump YAG laser 1.064um infrared laser, semiconductor side-pumped YAG laser 1.064um infrared laser.

There are many kinds of lasers, which can be divided into several types: solids, gases, liquids, semiconductors, and dyes.

(1) Solid-state lasers are generally small and robust, with high pulsed radiation power and a wide range of applications. Such as: Nd:YAG laser. Nd is a rare earth element, YAG is yttrium aluminum garnet, and its crystal structure is similar to that of ruby.

(2) Semiconductor lasers are small in size, light in weight, long in life, and simple in structure. They are particularly suitable for use in aircraft, warships, vehicles, and spacecraft. The semiconductor laser can change the wavelength of the laser by applying an electric field, a magnetic field, a temperature, a pressure, etc., and can convert the electric energy directly into a laser energy, so that it can develop rapidly.

(3) The gas laser uses the gas as the working substance, and has good monochromaticity and coherence. The laser wavelength can reach thousands of types and is widely used. The gas laser has a simple structure, a low manufacturing cost and convenient operation. Widely used in industrial and agricultural, medical, precision measurement, holographic technology. Gas lasers have a variety of incentives such as electrical energy, thermal energy, chemical energy, light energy, and nuclear energy.

(4) Dye lasers with liquid dyes as working substances were introduced in 1966 and are widely used in various scientific research fields. The number of dyes that have been found to produce laser light is about 500 or so. These dyes can be dissolved in alcohol, benzene, acetone, water or other solutions. They can also be contained in organic plastics in the solid state, or sublimated into steam and appear in gaseous form. So a dye laser is also called a "liquid laser." The outstanding feature of dye lasers is the continuously adjustable wavelength. There are many types of fuel lasers, which are inexpensive, efficient, and have output power comparable to gas and solid-state lasers. They are used in spectroscopy, photochemistry, medical, and agriculture.

(5) There are many types of infrared lasers and they have a wide range of applications. It is a new type of infrared radiation source, characterized by high radiation intensity, good monochromaticity, good coherence, and strong directionality.

(6) X-ray lasers are of great scientific and military value. They have advantages in laser weapons. Biology home X-ray lasers can study the molecular structure in living tissues or learn more about cell functions; X-ray lasers are used to record molecular structures. The photos, the resulting biomolecules have a high contrast.

(7) Chemical lasers Some chemical reactions produce enough high-energy atoms to release large amounts of energy that can be used to generate laser light.

(8) Free electron lasers These lasers are more suitable than others for producing very powerful radiation. Its working mechanism is different. It obtains tens of millions of volts of high-energy electron beam from an accelerator. After being subjected to a periodic magnetic field, it forms energy levels of different energy states and produces stimulated radiation.

(9) Excimer lasers, fiber-optic waveguide lasers, etc.

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