2 [mu] m mode-locked fiber laser based on SMF-SIMF-GIMF-SMF fiber structure

A fiber laser and fiber structure technology, applied in lasers, laser components, phonon exciters, etc., can solve problems such as low damage threshold and sensitivity to environmental factors, and achieve high damage threshold, low mode-locking threshold, compact and simple structure Effect

Active Publication Date: 2017-10-03
CHINA JILIANG UNIV
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Problems solved by technology

The damage threshold of the first two structures is relatively low, and the latter two structures are more s

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  • 2 [mu] m mode-locked fiber laser based on SMF-SIMF-GIMF-SMF fiber structure
  • 2 [mu] m mode-locked fiber laser based on SMF-SIMF-GIMF-SMF fiber structure
  • 2 [mu] m mode-locked fiber laser based on SMF-SIMF-GIMF-SMF fiber structure

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0019] figure 1 It is a structural schematic diagram of the SMF-SIMF-GIMF-SMF mode-locked fiber laser based on the present invention. As can be seen from the figure, the mode-locked fiber laser of the present invention consists of a 1570 single-mode fiber laser pump source 1, a wavelength division multiplexer 2, a single-mode thulium-doped fiber 3, a non-polarization-maintaining fiber isolator 4, a polarization controller 5, and an SMF- The SIMF-GIMF-SMF saturable absorber 6 and the coupler (fiber beam splitter) 7 are connected, and the ring cavity formed is an all-fiber structure, and all components are connected by optical fiber fusion. A pump source 1 is coupled and injected into the laser cavity through a wavelength division multiplexer 2, and a single-mode thulium-doped fiber 3 is used as a gain medium. The non-polarization-maintaining optical fi...

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Abstract

The invention discloses a 2 [mu] m mode-locked fiber laser based on an SMF-SIMF-GIMF-SMF fiber structure. The laser is of an annular cavity structure and comprises a pumping source, a wavelength division multiplexer, a gain fiber, a non-polarization-maintaining isolator and a polarization controller, an all-fiber saturable absorption device serving as a mode locking device and a coupler serving as an output; the all-fiber saturable absorption device is composed of an input single-mode fiber, a step multimode fiber, a gradient multimode fiber and an output single-mode fiber. The laser mode locking mechanism disclosed by the invention adopts the nonlinear multimode interference effect in the multimode fiber, has the advantages of all-fiber structure, high damage threshold, self starting of model locking, high stability and compact structure, and has a wide application prospect.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a 2 μm mode-locked fiber laser based on an SMF-SIMF-GIMF-SMF (single-mode-step multimode-gradient multimode-single-mode) fiber structure. Background technique [0002] 2μm mode-locked fiber lasers have broad application prospects in the fields of eye safety radar, laser medical treatment, photoelectric countermeasures, and special material processing. Saturable absorber (SA) is the key device for passively mode-locked fiber laser to achieve mode-locked pulse output, which has saturable or saturable-like absorption effect. There are mainly the following schemes to achieve passive mode locking: carbon nanotubes, semiconductor saturable absorber mirrors, nonlinear polarization rotation and nonlinear fiber loop mirrors. The damage threshold of the first two structures is relatively low, and the latter two structures are more sensitive to environmental factors, so these mode-locking mechanisms have c...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/091H01S3/10H01S3/11
CPCH01S3/06712H01S3/06716H01S3/06791H01S3/091H01S3/10061H01S3/1118
Inventor 李环环王兆坤李灿张军杰徐时清
Owner CHINA JILIANG UNIV
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