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Double-resonant-cavity all-optical-fiber mode-locked pulse laser

A mode-locked pulse, dual-resonator technology, which is applied in the fields of laser technology, fiber optics and nonlinear optics, can solve the problems of poor anti-interference ability, high production cost and high cost, and achieves high pulse energy, simple design and compact structure. Effect

Active Publication Date: 2014-04-02
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of complex system, high cost, and poor anti-interference ability in active mode-locked fiber lasers; at the same time, the manufacturing process of semiconductor saturable absorption mirror (SESAM) is difficult and the production cost is high. The material saturable absorber realizes passive mode locking, and the all-fiber design does not require additional modulation devices, which greatly reduces the loss of the resonator and realizes a highly integrated and stable laser system

Method used

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Embodiment 1

[0055] Such as Figure 5 As shown, the pump source 1 in the figure is a semiconductor laser diode with a center wavelength of 976nm; the fiber combiner 2 is a (2+1)×1 pump signal combiner, such as 6 / 125 or 20 / 125 type; 3 and 4 are rare-earth-doped optical fibers, and high-performance ytterbium-doped optical fibers produced by Nufern Company in the United States can be used; 5 is a saturable absorber, and graphene, carbon nanotubes or topological insulators can be used; the first reflective optical fiber Bragg The grating 6, the second reflective fiber Bragg grating 7, the third reflective fiber Bragg grating 8, and the fourth reflective fiber Bragg grating 9 can be either full-reflective or partially reflective gratings, and the reflectivity is R, where 0<R< 1; The optical isolator 10 can be a polarization-independent optical isolator.

[0056] The pump light enters the second gain fiber 4 through the pump end of the fiber combiner 2, and then reaches the fourth reflective f...

Embodiment 2

[0058] Such as Image 6 As shown, the pump source 1 in the figure is a semiconductor laser diode with a center wavelength of 976nm; the fiber combiner 2 is a (2+1)×1 pump signal combiner, such as 6 / 125 or 20 / 125 type; 3 and 4 are rare-earth-doped optical fibers, and high-performance ytterbium-doped optical fibers produced by Nufern Company in the United States can be used; 5 is a saturable absorber, and graphene, carbon nanotubes or topological insulators can be used; the first reflective optical fiber Bragg The grating 6, the second reflective fiber Bragg grating 7, and the third reflective fiber Bragg grating 8 can choose total reflection or partial reflection grating, and the reflectivity is R, where 0<R<1; the optical isolator 10 can choose polarization An irrelevant optical isolator; the fourth reflective fiber Bragg grating 9 is replaced by a total reflection mirror 12 .

[0059] The pump light enters the second gain fiber 4 through the pump end of the fiber combiner 2...

Embodiment 3

[0061] Such as Figure 7 As shown, the pump source 1 is a semiconductor laser diode with a center wavelength of 976nm; the wavelength division multiplexer 15 is a 980 / 1060nm single-mode wavelength division multiplexer; the first gain fiber 3 and the second gain fiber 4 are rare earth-doped fibers , the high-performance ytterbium-doped optical fiber produced by Nufern Company in the United States can be selected; the saturable absorber 5 can be selected from graphene, carbon nanotubes or topological insulators; the first reflective fiber Bragg grating 6 and the second reflective fiber Bragg grating 7 are optional Total inversion or partial reflection grating, its reflectivity is R (0<R<1); 10 is an optical isolator, optional polarization-independent optical isolator; beam splitter 13 can be a 90:10 fiber optic beam splitter; The optical fiber filter 14 may be a 1um band narrow-band filter.

[0062]The pump light passes through the 980nm end of the wavelength division multiplex...

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Abstract

The invention discloses a double-resonant-cavity all-optical-fiber mode-locked pulse laser, and belongs to the field of laser technology, optical fiber optics and nonlinear optics. The double-resonant-cavity all-optical-fiber mode-locked pulse laser mainly comprises a pumping source, an optical fiber beam combiner, a wavelength division multiplexer, a first gain optical fiber, a second gain optical fiber, a saturable absorption body, a reflection type optical fiber Bragg grating, an optical isolator, a circulator, a total reflector, a beam splitter and a filter. A linear cavity structure or an annular cavity structure is adopted. Compared with an SESAM (semiconductor saturable absorber mirror) mode-locked, NPR (nonlinear polarization rotation) and NPE (nonlinear polarization evolution) mode-locked technology, the laser provided by the invention has the advantages that the laser mode-locked pulse can be directly output by using the double resonant cavities and the saturable absorption body, the design is simple, the structure is compact, the cost is reduced, and the system output stability can be effectively improved.

Description

technical field [0001] The invention discloses an all-fiber mode-locked pulse laser with a double resonant cavity structure, belonging to the fields of laser technology, fiber optics and nonlinear optics. Background technique [0002] Fiber lasers have the advantages of small size, light weight, high conversion efficiency, and good output beam quality, and have been developed rapidly in recent years. Ultrashort pulse fiber lasers are gradually being used in material processing, laser medical treatment, The fields of industrial manufacturing, national defense and military, and scientific research have gained more and more users and market share, and have further become the research and development hotspots of various research institutions. [0003] In the current research on mode-locked fiber lasers, there are mainly active mode-locking and passive mode-locking techniques to obtain mode-locked pulses. Active mode-locking needs to be controlled by an external modulator, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/082H01S3/083H01S3/11
Inventor 王璞孙若愚金东臣
Owner BEIJING UNIV OF TECH
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