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Double-resonant-cavity coupled all-fiber Q-switched mode-locked pulse laser

A mode-locked pulse and dual-cavity technology, which is applied in the fields of laser technology, fiber optics and nonlinear optics, can solve the problem of insufficient single pulse energy of mode-locked lasers, insufficient narrow pulse width of Q-switched lasers, and poor anti-interference ability of the environment, etc. problems, to achieve the effect of easy industrial production and application, compact structure, and strong environmental interference ability

Inactive Publication Date: 2019-03-01
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the technical problems existing in the prior art, such as complex optical path system, large loss, high cost, poor anti-environmental interference ability, insufficient narrow pulse width of Q-switched laser, and insufficient high single pulse energy of mode-locked laser, the present invention provides a dual-resonant The cavity-coupled all-fiber Q-switched mode-locked pulse laser uses doped rare-earth fiber as a saturable absorber to realize passive Q-switching, and uses a reflective saturable absorber to achieve passive mode-locking, and the pump input device is placed in the There is no need for additional modulation devices outside the cavity and inside the cavity, which greatly reduces the loss of the resonator and realizes a laser system with high integration, high efficiency and high stability

Method used

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  • Double-resonant-cavity coupled all-fiber Q-switched mode-locked pulse laser
  • Double-resonant-cavity coupled all-fiber Q-switched mode-locked pulse laser
  • Double-resonant-cavity coupled all-fiber Q-switched mode-locked pulse laser

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Embodiment 1

[0037] Such as figure 1 As shown, a dual-cavity coupled all-fiber Q-switched mode-locked pulse laser includes a pumping device, a laser resonator, a gain fiber, a saturable absorbing element, and a laser output device. The pumping device includes a pumping source 1, an optical fiber A beam combiner 2 and a wavelength division multiplexer 10; the laser resonator includes a first reflective fiber Bragg grating 5, a second reflective fiber Bragg grating 6, a semiconductor saturable absorbing mirror (SESAM) 7, a third reflective fiber Bragg grating Grating 8, total reflection mirror 13; gain fiber includes first gain fiber 3 and second gain fiber 4; laser output device includes optical isolator 9, circulator 11 and fiber beam splitter 12.

[0038]When the linear cavity structure is adopted, the first reflective fiber Bragg grating 5 and the second reflective fiber Bragg grating 6 constitute an inner resonant cavity, and the first gain fiber 3 is included in the inner resonant cavi...

Embodiment 2

[0045] Such as figure 2 As shown, the basic structure is similar to that of Embodiment 1, except that the pump source 1 and the fiber combiner 2 are placed between the first reflective fiber Bragg grating 5 and the second gain fiber 4. This can reduce the requirements of the laser output on the device to a certain extent.

Embodiment 3

[0047] Such as image 3 shown. 1 in the figure is the pump source, which can be a semiconductor laser diode with a center wavelength of 976nm; 2 is an optical fiber combiner, and a (2+1)×1 pump signal combiner can be used, such as 6 / 125 or 10 / 125 type; 3 and 4 are rare-earth-doped optical fibers, which can be ytterbium-doped optical fibers with a core diameter of 6 μm or 10 μm produced by Nufern Company in the United States; 5 and 8 are reflective fiber Bragg gratings, and total reflection or partial reflection gratings can be selected , the reflectivity is between 0 and 1; 7 is a broadband semiconductor saturable absorber mirror, and other broadband reflective saturable absorbers can also be selected; 9 is an optical isolator, a polarization-independent optical isolator is optional.

[0048] The pump light generated by the pump source 1 enters the second gain fiber 4 through the pump end of the fiber combiner 2, and then reaches the third reflective fiber Bragg grating 8, w...

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Abstract

The invention discloses a double-resonant-cavity coupled all-fiber Q-switched mode-locked pulse laser. The double-resonant-cavity coupled all-fiber Q-switched mode-locked pulse laser comprises a pumping device, a laser resonant cavity, a gain optical fiber and a laser output device, wherein the laser is provided with a linear cavity or an annular cavity structure for outputting laser pump, whereinthe pumping device comprises a pumping source, an optical fiber beam combiner and a wavelength division multiplexer; the laser resonant cavity comprises a first reflection type fiber bragg grating, asecond reflection type fiber bragg grating, a semiconductor saturable absorption mirror, a third reflection type fiber bragg grating and a total reflection mirror; the gain optical fiber comprises afirst gain optical fiber and a second gain optical fiber; and the laser output device comprises an optical isolator, an annular device and an optical fiber beam splitter. The mode-locked pulse laser adopts the all-fiber structure, which is simple in design and compact in structure, and capable of effectively improving laser output efficiency and stability and outputting the Q-switched mode-lockingpulse with high single-pulse energy and narrow pulse width.

Description

technical field [0001] The invention belongs to the technical fields of laser technology, fiber optics and nonlinear optics, and in particular relates to a double-cavity coupled all-fiber Q-switched mode-locked pulse laser. Background technique [0002] Due to its small size, light weight, high conversion efficiency, compact structure, low cost, easy heat dissipation, good output beam quality, and easy maintenance, fiber lasers have become one of the research hotspots in the laser field in recent years. It has been widely used in fields such as laser processing, laser medical treatment, optical communication, national defense and scientific research. [0003] At present, in fiber lasers, there are two ways to achieve pulses: one is Q-switching, which is divided into active Q-switching and passive Q-switching. The pulse width obtained by Q-switching is generally in the order of μ s to ns; One is mode-locking, which is divided into active mode-locking and passive mode-locking...

Claims

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Application Information

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IPC IPC(8): H01S3/11
CPCH01S3/1115
Inventor 王璞王敏程昭晨
Owner BEIJING UNIV OF TECH
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