Linear polarization output all-fiber pulse dual-cavity lasers

Abstract

The present invention discloses linear polarization output all-fiber pulse dual-cavity lasers. The laser comprises a pump source, a polarization maintain fiber beam combiner, a first polarization maintain gain fiber, a second polarization maintain gain fiber, a first reflective polarization maintain fiber Bragg grating, a second reflective polarization maintain fiber Bragg grating, a third reflective polarization maintain fiber Bragg grating, and a fourth reflective polarization maintain fiber Bragg grating. Or, the laser comprises a pump source, a polarization maintain fiber wavelength division multiplexer, a first polarization maintain gain fiber, a second polarization maintain gain fiber, a first reflective polarization maintain fiber Bragg grating, a second reflective polarization maintain fiber Bragg grating, a third reflective polarization maintain fiber Bragg grating, and a polarization maintain fiber circulator. The laser has a dual-resonance cavity crossing modulation structure, uses a doped fiber as a gain medium and a saturated absorber, and is an all-fiber polarization maintain laser realized based on the novel polarization technology. The laser is simple in design, has a compact structure, can output linear polarization pulse laser efficiently and stably, and has characteristics of high stability, high efficiency and high energy.

Description

technical field [0001] The invention belongs to the field of laser technology and nonlinear optics, in particular to an all-fiber pulsed double-cavity laser with linear polarization output. Background technique [0002] Fiber lasers have the advantages of small size, light weight, high conversion efficiency, and good output beam quality. In recent years, they have developed rapidly, and fiber lasers with different structures and characteristics have been successfully developed. The emergence of double-clad large mode area (LMA) fibers has led to the rapid development of high-power fiber lasers, and has now achieved a near-single-mode output of 1-2kW. However, most of the existing literature reports are random polarization output. In many fields such as fiber optic gyroscope, fiber optic sensing, nonlinear frequency conversion, coherent beam combination, etc., it is necessary to maintain stable polarization characteristics of the output laser. [0003] In the research of po...

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Problems solved by technology

However, the spatial coupling method has disadvantages such as complex structure, poor stability, and easy to cause cross-section damage; the linear polarization of the polarization maintaining isolator makes the output laser loss nearly half

In the research of pulsed lasers, laser output with nanosecond or submillisecond pulse width can be achieved by adding acousto-optic, electro-optic modulators or solid-state saturable absorbers in the cavity, but the combination of optical fibers and nonlinear devices will increase the complexity of the system , additional loss is introduced, the system stability is reduced, and the ability to resist environmental interference is weak, which is not conducive to industrialization and practical promotion

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