A method for improving working stability of fiber laser

Abstract

The invention discloses a method for improving the working stability of a fiber laser, comprising the following steps: step 1, obtaining the gain fiber total pump absorption coefficient α1 corresponding to the mode instability threshold of the fiber laser; step 2, determining the working temperature range of the laser; Step 3: On both sides of the wavelength L corresponding to the absorption peak of the gain fiber, select a first pump laser with a center wavelength less than L and a second pump laser with a center wavelength greater than L, and determine the first pump laser and the second pump laser. the center wavelength of the laser. The invention selects the pump lasers which are respectively larger than the absorption peak wavelength of the gain fiber and smaller than the absorption peak wavelength of the gain fiber, so that when the temperature changes, the total pump absorption coefficient of the gain fiber will not change greatly, thereby improving the stability of the fiber laser operation. .

Description

technical field [0001] The invention relates to the field of lasers, in particular to a method for improving the working stability of a fiber laser. Background technique [0002] High-power fiber lasers have been greatly developed in recent years, and they have the characteristics of high gain, high conversion efficiency, low threshold, good output beam quality, narrow linewidth, simple structure, and high reliability. It plays an important role in industries such as industrial shipbuilding, aircraft and automobile manufacturing, aerospace, and 3D printing. [0003] At present, near-infrared fiber lasers in the 1μm band usually use semiconductor lasers with wavelengths around 915nm or 976nm as the pump source. The ytterbium-doped active fiber absorbs the pump light and converts it into signal light output through stimulated radiation. [0004] Ytterbium-doped active fiber has two absorption peaks at 915nm and 976nm respectively, such as figure 1 As shown, when the center w...

AI Technical Summary

Problems solved by technology

[0011] At present, for fiber lasers that use single-wavelength pumping, their temperature adaptability is poor, and the temperature range for stable operation is narrow. Usually, it is necessary to set the temperature of the external refrigerator in advance to keep the temperature of the laser at roughly the same level during operation. At high temperature, the temperature control accuracy of the refrigeration system is required to be high

However, due to complex environmental factors, various factors of the external refrigerator itself, and the complex state of the laser when it is working, the temperature will change, resulting in the instability of the laser.

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