Polarization maintaining optical fiber mode-locked laser

Abstract

A polarization maintaining optical fiber mode-locked laser is characterized by comprising an optical fiber reflector, a variable optical attenuator, a polarizer, a second input port of a wavelength division multiplexer, an output port of the wavelength division multiplexer, gain optical fibers, an isolator, a filter, an input port of a beam splitter, a first output port of the beam splitter and a saturable absorber mirror, wherein the optical fiber reflector, the variable optical attenuator, the polarizer, the second input port of the wavelength division multiplexer, the output port of the wavelength division multiplexer, the gain optical fibers, the isolator, the filter, the input port of the beam splitter, the first output port of the beam splitter and the saturable absorber mirror are sequentially connected in a fusion welding mode through polarization maintaining optical fibers. A pumping source is connected with a first input port of the wavelength division multiplexer in a fusion welding mode, and a second output port of the beam splitter is a laser output port. According to the polarization maintaining optical fiber mode-locked laser, two mode-locked mechanisms are utilized simultaneously. The polarization maintaining optical fiber mode-locked laser has the advantages that the full polarization maintaining optical fiber structure is provided, high mode-locked self-starting performance is achieved, and high stability and the compact structure are achieved. The polarization maintaining optical fiber mode-locked laser has wide application prospects.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a polarization-maintaining fiber mode-locked laser. Background technique [0002] Ultrashort pulse laser has important and extensive uses in optical communication, biomedicine, laser processing, scientific research, etc.; in high-power laser devices, a good and stable pulse seed source is of great significance. [0003] Solid-state lasers have high requirements in terms of size, environmental requirements, and stability. The fiber laser can well avoid the above problems. There are three main mechanisms for fiber lasers to realize pulse output: Q-switching, active mode-locking and passive mode-locking. Among them, passive mode-locking has the advantages of good stability, high pulse quality, simple structure, and an all-fiber structure. In fiber lasers, there are mainly the following schemes to achieve passive mode locking: nonlinear polarization rotation, nonlinear fiber loop mirrors and satur...

AI Technical Summary

Problems solved by technology

Because of the former two structures, the polarization of the optical fiber needs to be controlled, so the optical fiber is very sensitive to vibration, temperature, and bending, and is easy to lose lock and has poor recoverability.

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