What are the types of fiber lasers？

I. What is a fiber laser

Fiber laser refers to a laser that uses rare earth-doped glass fiber as a gain medium. Fiber laser can be developed on the basis of fiber amplifier: it is easy to form high power density in the fiber under the action of pump light. , causing the laser energy level of the laser working material "particle number inversion", when a positive feedback loop (constituting a resonant cavity) is properly added, the laser oscillation output can be formed.

The application range of fiber laser is very wide, including laser fiber communication, laser space telecommunication, industrial shipbuilding, automobile manufacturing, laser engraving, laser marking, laser cutting, printing roller, metal non-metal drilling/cutting/welding (copper Welding, quenching, cladding and deep welding), military defense and security, medical equipment and equipment, large-scale infrastructure, as a pump source for other lasers, etc.

Second, what types of fiber lasers are there

(1) Classification according to the type of optical fiber material

1. Crystal fiber laser. The working material is laser crystal fiber, mainly including ruby ​​single crystal fiber laser and nd3+: YAG single crystal fiber laser.

2. Nonlinear optical fiber laser. There are mainly stimulated Raman scattering fiber lasers and stimulated Brillouin scattering fiber lasers.

3. Rare earth doped fiber laser. The matrix material of the optical fiber is glass, and rare earth element ions are doped into the optical fiber to activate it to make a fiber laser.

4. Plastic fiber laser. Fiber lasers are made by doping laser dyes into the core or cladding of plastic optical fibers.

(2) Classified by gain medium

1. Crystal fiber laser. The working material is laser crystal fiber, mainly including ruby ​​single crystal fiber laser and Nd3+:YAG single crystal fiber laser.

2. Nonlinear optical fiber laser. There are mainly stimulated Raman scattering fiber lasers and stimulated Brillouin scattering fiber lasers.

3. Rare earth doped fiber laser. Doping rare earth element ions into the fiber to activate it, (Nd3+, Er3+, Yb3+, Tm3+, etc., the matrix can be quartz glass, zirconium fluoride glass, single crystal) to make a fiber laser.

4. Plastic fiber laser. Fiber lasers are made by doping laser dyes into the core or cladding of plastic optical fibers.

(3) Classification by cavity structure

It is divided into F-P cavity, ring cavity, loop reflector fiber resonator and "8" shape cavity, DBR fiber laser, DFB fiber laser, etc.

(4) Classification by fiber structure

It is divided into single cladding fiber laser, double cladding fiber laser, photonic crystal fiber laser, special fiber laser.

(5) Classification by output laser characteristics

Divided into continuous fiber lasers and pulsed fiber lasers, among which pulsed fiber lasers can be divided into Q-switched fiber lasers (with a pulse width of the order of ns) and mode-locked fiber lasers (with a pulse width of ps or fs) according to their pulse formation principles. magnitude).