A laser is a device used to emit laser light and is widely used in various industries. Depending on the working medium, common lasers can be divided into gas lasers, solid-state lasers, semiconductor lasers, fiber lasers, and liquid lasers, and in recent years free-electron lasers have also been developed.
Gas lasers utilize gas as the working substance to generate laser light.handheld laser marking machine It consists of three main parts: the activation gas inside the discharge tube, the resonant cavity formed by a pair of mirrors and the excitation source. Gas lasers are simple in structure, low in cost, convenient in operation, uniform in working medium, good in beam quality and can work continuously for a long and stable period of time. Therefore, it is the most varied and widely used class of lasers.
Solid-state lasers use solid laser material as the working substance. The working medium is a small amount of activation ions uniformly doped into a crystal or glass as the matrix material. Solid-state lasers are characterized by small size, ease of use and high output power. Solid-state lasers have shorter output wavelengths, high coupling efficiency with metals, favorable metal surface absorption, and good performance on metal processing. Therefore, solid-state lasers are widely used in automotive, metallurgy, machinery manufacturing and other metal processing fields.
Semiconductor lasers, also known as laser diodes, use semiconductor material as the working substance.little pecker laser engraver Due to the differences in the structure of the material, the specific process of generating laser light is more specific for different kinds. Semiconductor diode lasers are the most practical and important class of lasers. It is small, long-lived, and can be pumped by simple injection of current, and its operating voltage and current are compatible with integrated circuits and thus can be monolithically integrated with them. And can also be used up to GHz frequency direct current modulation to obtain high-speed modulation of the laser output. Because of these advantages, diode lasers are widely used in laser communication, medical cosmetology, stage lighting, optical storage, laser engraving and printing, ranging, and radar.
Fiber lasers are lasers that use rare earth element doped glass fibers as the gain medium. Fiber laser can be developed on the basis of fiber amplifiers: in the pump light under the action of the fiber is very easy to form a high power density, resulting in the laser working material of the laser energy level "particle number inversion", when appropriate to join the positive feedback loop (constituting a resonant cavity) can form a laser oscillation output. Fiber laser has a wide range of applications, including laser fiber communication, laser space telecommunication, industrial shipbuilding, automobile manufacturing, laser engraving laser marking laser cutting, printing roller, military defense security, medical equipment, instrumentation, as the pump source of other lasers and so on.
Liquid lasers are a relatively unique type of laser, also known as dye lasers. The activating substance for this type of laser is a solution formed when certain organic dyes are dissolved in a liquid such as ethanol, methanol or water.
Depending on the mode of operation, lasers can be categorized into continuous lasers and pulsed lasers.
According to the different basic working principles, various lasers are similar, including the pumping source, optical resonant cavity and gain medium three parts.
