Full polarization-maintaining fiber dispersion management ring cavity mode-locking femtosecond ytterbium-doped fiber laser

Abstract

The invention discloses a full polarization-maintaining fiber dispersion management ring cavity mode-locking femtosecond ytterbium-doped fiber laser, which is applied to the field of laser, and comprises a double-pigtail fiber collimation semiconductor saturable absorber mirror, a three-port circulator, a gain fiber, a chirped fiber grating, a wavelength division multiplexer and a pumping source. All the devices are welded together through single-mode polarization-maintaining fibers. The full-fiber device forms a laser resonant cavity between the semiconductor saturable absorber mirror and the fiber bragg grating. In order to solve the problems that an existing semiconductor saturable absorber mirror mode-locked linear cavity is prone to forming parasitic oscillation, mode locking in the cavity is unstable, the anti-damage threshold value of a semiconductor saturable absorber mirror is greatly reduced, and the semiconductor saturable absorber mirror is prone to being damaged, an annular cavity structure is adopted, and the laser is high in stability, and the influence of parasitic oscillation generated by back reflection of fiber fusion points and end face reflection of an output port is avoided. Extra-cavity pumping is adopted, and the mode-locked laser is easy to realize high repetition frequency; the mode-locked laser is good in self-starting performance, and wide spectrum output can be obtained.

Description

technical field [0001] The invention belongs to the field of lasers, in particular to a passive mode-locked fully polarization-maintaining fiber laser technology based on a semiconductor saturable absorber mirror. Background technique [0002] Ultrashort optical pulses are widely used in ultrafast optical diagnosis, optical precision measurement, precision machining, laser medical treatment and bioengineering, and are also frontier topics in nonlinear optics and ultrafast optics. Among them, hundreds of femtosecond ultrashort pulses have the characteristics of extremely narrow pulse width, ultra-wide spectrum, and extremely high peak power, and are widely used in research fields such as dry optical frequency combs, molecular transient dynamics, and nonlinear optics. . Compared with ultrashort pulse laser sources such as solid-state lasers, semiconductor lasers, gas lasers, and dye lasers, ultrashort pulse fiber lasers have the advantages of low manufacturing cost, simple an...

AI Technical Summary

Problems solved by technology

The disadvantages of semiconductor saturable absorber mirrors are low damage resistance threshold, irreversible loss, and relatively short lifespan.

The common semiconductor saturable absorber mirror laser cavity usually adopts a linear cavity structure, but there are certain problems in the stability of the laser resonator formed by this structure. The line cavity is a standing wave cavity. Due to the back reflection of the fiber fusion point and the output port The problem of end face reflection can easily cause part of the signal light to form parasitic oscillations in the cavity, which seriously affects the mode-locking stability of the original resonator, and greatly reduces the anti-damage threshold of the semiconductor saturable absorber mirror, which is extremely vulnerable to damage

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