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2-micrometer waveband all-polarization-maintaining locked-mode ultrafast pulse fiber laser

A technology of fiber lasers and ultrashort pulses, which is applied to lasers, laser components, phonon exciters, etc., can solve the problem of low power of fiber lasers, inability to realize self-mode-locking of "8"-shaped fiber loop mirrors, and low stability and other problems, to achieve good environmental stability, stable mode locking, and good stability

Active Publication Date: 2016-06-29
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] In general, in the "8" shape mode-locked pulsed fiber laser, in order to achieve self-mode-locking, there must be a sufficiently large pump threshold power, and the power of some fiber lasers is relatively low, which cannot achieve "8" Self-mode-locking of zigzag fiber loop mirror with low stability

Method used

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  • 2-micrometer waveband all-polarization-maintaining locked-mode ultrafast pulse fiber laser
  • 2-micrometer waveband all-polarization-maintaining locked-mode ultrafast pulse fiber laser

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Embodiment 2

[0030] A fully polarization-maintaining hybrid mode-locked ultrashort pulse fiber laser in the 2-micron band adopts figure 2The "8"-shaped cavity structure shown mainly includes: a laser with a center wavelength of 793nm and an output power of 5W is used as a laser pump source 1; a 793 / 2000nm polarization-maintaining beam combiner 2 is used as a pump beam combiner; as a gain medium The polarization-maintaining thulium-doped gain fiber 3; the 50:50 polarization-maintaining directional coupler 4; the graphene saturable absorber 9, wherein polymethyl methacrylate (PMMA) can be coated on the copper lining by using the spin coating method Then place it in an aqueous ammonium persulfate solution to remove the copper substrate to form a polymethyl methacrylate / graphene stack, capture it with a fiber optic pin, dry it in an oven, and clamp it between the two. Between two jumper heads, and the jumper head is fixed with a flange; the first polarization-maintaining isolator 10; the seco...

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Abstract

The invention relates to a 2-micrometer waveband all-polarization-maintaining locked-mode ultrafast pulse fiber laser, and belongs to the field of the laser technology and nonlinear optics. The 2-micrometer waveband all-polarization-maintaining locked-mode ultrafast pulse fiber laser mainly comprises a laser pump source, a polarization-maintaining pump combiner, a polarization-maintaining thulium-doped or thulium and holmium co-doped optical fiber, a polarization-maintaining circulator, a polarization-maintaining isolator, a saturable absorption body or saturable absorption mirror, a polarization-maintaining coupler and a polarization-maintaining passive optical fiber. The thulium-doped or holmium-doped or thulium and holmium co-doped optical fiber is used as a gain medium, and the saturable absorption body or the saturable absorption mirror is combined with a 8-shaped resonant cavity to be collectively used as a passive locked-mode device, so that the 2-micrometer waveband, low-power pump, all-polarization-maintaining and mixed locked-mode ultrafast pulse is outputted. By adopting the structure, the all-optical-fiber welding is realized. The 2-micrometer waveband all-polarization-maintaining locked-mode ultrafast pulse fiber laser has the advantages of low pump power, stable locked mode, simple structure and stable and reliable system locked mode, and not only can be used as a laser light source with excellent performance, but also can be used as a signal seed source to be further amplified.

Description

technical field [0001] The invention relates to the technical field of fiber lasers, in particular to a full polarization-maintaining hybrid mode-locked ultrashort pulse fiber laser in the 2 micron band. Background technique [0002] In the prior art, a fiber laser uses a fiber doped with rare earth elements as a gain medium. By doping with different rare earth elements, the working band of the fiber laser can be covered to the mid-infrared band. Compared with solid-state lasers, fiber lasers have the advantages of small size, low threshold, high efficiency, good beam quality, and no need to adjust the optical path. Among them, the 2-micron fiber laser is within the safe range of human eyes because its output wavelength is close to the absorption peak of hydroxyl H-O, and has important prospects in many fields. [0003] In recent years, high-power pulsed lasers have been widely used in processing, military affairs, and medicine. The average output power of ordinary pulsed ...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/098H01S3/083
CPCH01S3/06708H01S3/06712H01S3/06716H01S3/083H01S3/1303H01S3/137
Inventor 王小发姜秋霞顾小辉张俊红夏青彭晓玲
Owner CHONGQING UNIV OF POSTS & TELECOMM
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