Mechanical tuning Q system for optical fiber laser

The invention discloses a mechanical tuning Q system for an optical fiber laser. The mechanical tuning Q system is characterized in that the system comprises a pumping semiconductor laser with tail fibers, the output tail fibers of the pumping semiconductor laser are connected to a pumping input end opening of an optical fiber beam combiner, an output optical fiber end opening of the optical fiber beam combiner is connected with a high-reflectivity optical fiber prague raster, the other end of the raster is welded to ytterbium-doped double-cladding layer optical fibers, the other ends of the ytterbium-doped double-cladding layer optical fibers are welded to a low-reflectivity optical fiber prague raster arranged on polarization maintaining optical fibers in a written mode, the mechanical tuning Q system for modulating laser pulse output is arranged between the ytterbium-doped double-cladding layer optical fibers and the low-reflectivity optical fiber prague raster, a piezoelectric element in the mechanical tuning Q system is controlled by a drive circuit, a modulation signal drive circuit is used for driving the piezoelectric element to periodically press the optical fibers in a cavity so as to modulate the polarization direction of the optical fibers in the cavity, and the other end of the low-reflectivity optical fiber prague raster is the output end of the optical fiber laser. The mechanical tuning Q system has the advantages that high modulation frequency is achieved, the modulation distance can be precisely controlled, the modulation characteristic can be changed through mechanical design, and good reliability is achieved.