METHOD FOR REALIZING SYNCHRONOUS TUNING OF WAVELENGTH AND REPETITION FREQUENCY IN PASSIVE MODE-LOCKING LASER

摘要

A method for realizing synchronous tuning of a wavelength and a repetition frequency in a passive mode-locking laser. One end of a section of active optical fiber or passive optical fiber in a resonant cavity of the laser is polished into a mirror surface and fixed on a multi-dimensional tuning frame (9); a semiconductor saturable absorption mirror (4) with copper radiators is mounted on a fixing support, and by rotating a micrometer of a rotating platform on the multi-dimensional tuning frame, the coupling angle of the section of optical fiber and the semiconductor saturable absorption mirror is mechanically tuned, so that the laser wavelength and the repetition frequency are synchronously tuned. Compared with a conventional method adopting piezoelectric ceramic or a fiber grating, the apparatus is simpler and more compact. By rotating the micrometer of the rotating platform on the multi-dimensional tuning frame, high-precision synchronous tuning of the laser wavelength and the repetition frequency can be achieved, and the repetition frequency tuning range can reach 1 MHz. The tuning method is simple and easy to realize, and can be applied to the fields of precise gas detection, gas spectrum analysis, frequency calibration, nonlinear biophotonics and the like.