Waveguide laser for carrying out transverse mode control by adopting filtering film matcher

Abstract

The invention relates to a waveguide laser for carrying out transverse mode control by adopting a filtering film matcher, which belongs to the technical field of waveguide lasers. The waveguide laser is characterized by comprising a pumping device, a waveguide laser medium and a cavity lens, wherein the cavity lens is arranged on the end surface of the laser medium. The waveguide laser has the main technical scheme of adopting a sectional type waveguide structure of a filtering film matcher, namely a longitudinal waveguide structure or a parameter variable structure so that a laser beam is conducted or oscillated in waveguides with different parameters. In the process, a high-order mode consumes more energy than a low-order mode does and is weakened and even inhibited in mode competition,and the mode distributing power proportion is changed, therefore, a laser outputs laser light with better light beam quality. By adopting a novel parameter variable waveguide structure, the waveguidelaser of the invention can improve the quality of the light beam and is beneficial to realizing a large-mode field waveguide laser, thereby improving the power of the waveguide laser. The invention can be applied to a high-power waveguide laser.

Description

technical field [0001] The invention relates to a waveguide laser, in particular to a waveguide laser using a filter mode matcher for transverse mode control. Background technique [0002] When designing waveguide lasers, it is generally desirable to obtain high-power, high-beam-quality laser output. Among them, the maximum output power of the laser is affected by the saturation effect of the gain medium, which is proportional to the equivalent cross-sectional area of ​​the mode field; for fiber lasers, the power increase is more affected by stimulated Brillouin scattering (SBS), stimulated Limitations of nonlinear effects such as Raman scattering (SRS) and self-phase modulation (SPM), the power threshold generated by these nonlinear effects is also proportional to the equivalent area of ​​the mode field. In order to obtain higher power laser output, it is often necessary to increase the core diameter of the waveguide, but increasing the core diameter will inevitably lead t...

AI Technical Summary

Problems solved by technology

However, because this method is based on the change of the fiber core parameters, a large loss will be introduced when two fibers with different parameters are coupled; when the light propagates in the fiber core, both high-order modes and low-order modes will produce certain , which affects the power of the lower order modes, resulting in a reduction in the power of the desired mode

If it is applied to a laser, it is difficult to obtain high-power laser output

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