A fully polarization-maintaining hybrid mode-locked ultrashort-pulse fiber laser in the 2-micron band
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 and low stability of fiber lasers, and the inability to realize self-mode-locking of "8"-shaped fiber loop mirrors and other problems, to achieve the effect of good environmental stability, good stability, and stable mode locking
Active Publication Date: 2018-06-15
CHONGQING UNIV OF POSTS & TELECOMM
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[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
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[0030] A 2-micron band fully polarization-maintaining hybrid mode-locked ultrashort pulse fiber laser adopts such as figure 2The shown "8"-shaped cavity structure mainly includes: a laser with a center wavelength of 793nm and an output power of 5W as a laser pump source 1; a 793 / 2000nm polarization-maintaining beam combiner 2 as a pump beam combiner; as a gain medium The polarization-maintaining thulium-doped gain fiber 3; 50:50 polarization-maintaining directional coupler 4; graphene saturable absorber 9, in which polymethyl methacrylate (PMMA) can be coated with copper lining by spin coating method On the graphene thin layer on the bottom, it was then placed in an aqueous ammonium persulfate solution to eliminate the copper substrate to form a polymethyl methacrylate / graphene stack, which was captured with fiber optic pins, dried in an oven, and sandwiched between two layers. Between the jumper heads, and the jumper head is fixed with a flange; a first polarization-maintain...
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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 2-micron waveband fully polarization-maintaining hybrid mode-locking ultra-short pulse fiber laser. Background technique [0002] In the prior art, a fiber laser is a laser in which a rare-earth element-doped fiber is used 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 has an important prospect in many fields because its output wavelength is close to the absorption peak of hydroxyl H-O, which is within the safety range of human eyes. [0003] In recent years, high-power pulsed lasers have been widely used in processing, military, and medicine. The average output power of o...
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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