Ultra-short pulse solid laser with continuous adjustable repetition frequency

Abstract

The invention discloses an ultra-short pulse solid laser with continuous adjustable repetition frequency. The ultra-short pulse solid laser comprises a pumping source, a gain medium, a resonant cavity, a parallel planar reflector set, a mode locking device and a coupling output mirror, wherein the pumping source is used for pumping sufficient gain required by the gain medium; the resonant cavity is used for forming a condition for laser back-forth oscillation; the mode locking device is used for realizing modulation of a longitudinal mode of the laser so as to realize ultra-short pulse; the pumping source is used for outputting laser through optical fiber coupling; the laser is coupled into the gain medium after being shaped; laser emitted by the gain medium forms oscillation laser through the resonant cavity; the oscillation laser is converged to the mode locking device through a concave surface reflector of the resonant cavity; the mode locking device forms multiple back-forth oscillation and modulation on the laser by means of the resonant cavity and the parallel planar reflector set; and finally, continuous ultra-short pulse is output through the coupling output mirror.

Description

technical field [0001] The invention relates to the technical field of solid lasers, in particular to an ultrashort pulse solid laser with continuously adjustable repetition rate. Background technique [0002] Ultrashort pulse lasers are widely used in biology, medicine, chemistry, physics, laser microprocessing, laser satellite ranging and other fields. As an effective means of obtaining ultrashort pulses, mode locking is favored by the majority of scientific researchers. The main methods of mode-locking include active mode-locking, passive mode-locking (including passive mode-locking of saturable absorbers and Kerr lens mode-locking), collision mode-locking, injection mode-locking and other methods. Currently, Kerr lens mode-locked lasers and semiconductor saturable absorber (SESAM) passive mode-locked lasers are the most widely used. [0003] Document 1. In 1991, Spence et al. from the University of St. Andrews in the United Kingdom published an article entitled "60-fsec...

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Problems solved by technology

The repetition frequency of the mode-locked laser depends on the cavity length of the resonator. Usually, in order to increase the number of longitudinal mode oscillations in the resonator, the length of the resonator is between 1m and 2m. Therefore, the volume of the laser is relatively large; and for The same mode-locked laser can only output laser pulses with one repetition rate once the position of the optical element is determined

In actual application, if different repetition frequencies are required, the structure of the resonant cavity needs to be changed to lengthen or shorten the resonant cavity, the laser should be redesigned and processed, and the position of each optical device should be changed. Integration and practicality bring great inconvenience

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