MULTI-WAVELENGTH AND SINGLE-FREQUENCY Q-SWITCHING OPTICAL FIBER LASER DEVICE

摘要

The invention discloses a multi-wavelength and single-frequency Q-switching optical fiber laser device. The laser device comprises a saturable absorber, a high gain optical fiber, a polarization-maintaining multi-wavelength narrow-band fiber Bragg grating, a resonant cavity temperature control module, a polarization-maintaining wavelength division multiplexer, a pump source and a polarization-maintaining light isolator. By taking a highly doped phosphate optical fiber as a laser gain medium, two ends of the optical fiber device are connected with the saturable absorber and the polarization-maintaining multi-wavelength narrow-band fiber Bragg grating respectively to form a short linear laser cavity. A short cavity length of the short linear laser cavity can realize single longitudinal mode operation of laser in the resonant cavity, and meanwhile, a stable multi-wavelength and single-frequency pulse laser output is realized in the resonant cavity by combining multi-wavelength resonance caused by the polarization-maintaining multi-wavelength narrow-band fiber Bragg grating with passive Q-switching performance of the saturable absorber in the cavity. The multi-wavelength single-frequency Q-switching optical fiber laser device of the invention realizes output of a plurality of wavelength pulse laser with adjusted repeated frequency simultaneously, and the laser in each wavelength is maintained in single-frequency operation, such that the multi-wavelength single-frequency Q-switching optical fiber laser device can be widely applied to aspects of laser radar, laser sensing, gas detection and the like.