Linear polarization laser output high-power optical fiber amplifier and output control method

Abstract

The invention relates to a linear polarization laser output high-power optical fiber amplifier and an output control method. The optical fiber amplifier comprises an optoisolator, a pumping beam combiner, a double-clad active optical fiber, an optical fiber collimator, a polarizer, a pumping laser and a pumping laser drive control circuit. The polarizer is provided with a main polarization shaft output end and an auxiliary polarization shaft output end. A microprocessor of the pumping laser drive control circuit is connected with a pumping drive circuit, the pumping drive circuit is connected with the pumping laser, a photoelectric detector connected to the auxiliary polarization shaft output port and a current detector for monitoring a pumping drive current are connected with the microprocessor. The control method includes the steps that a total power-current function P (I) and insertion loss of a main polarization shaft and an auxiliary polarization shaft are firstly obtained and stored; auxiliary polarization shaft output power is obtained through the photoelectric detector, when a polarization state changes, the pumping drive current is calculated, amplifier output total power is adjusted, constant output of laser power of the main polarization shaft is achieved without influence of environmental factors. Moreover, a luminous power beam splitting device is not needed, feedback control is achieved, and cost is reduced.

Description

Technical field [0001] The invention relates to an optical fiber amplifier, in particular to a high-power optical fiber amplifier with stable power output, linearly polarized laser output and an output control method applied to the final stage of the main oscillation laser amplifier structure (MOPA) fiber laser. Background technique [0002] High-power fiber lasers have a wide range of applications in the field of space, precision machining, laser radar, laser ranging, laser medical treatment, etc. due to their simple heat dissipation, compact structure, high output power, high power density and long life. Among them, linearly polarized high-power fiber lasers using main oscillation laser amplification technology are popular in some special laser application technical fields because of their linearly polarized high-power output characteristics. However, because fiber lasers or fiber amplifiers are susceptible to environmental factors such as vibration, stress changes, and tempera...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of the poor polarization stability of the current main oscillation laser amplification structure linearly polarized fiber laser system and the serious decline in power stability after the output laser is polarized, the present invention provides a MOPA structure fiber laser that can make the fiber laser output stable linearly polarized laser The final stage fiber amplifier, that is, linearly polarized laser output high power fiber amplifier

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