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All-fiber pulse laser utilizing cross modulation of resonant cavities

A pulsed laser and cross-modulation technology, applied in the field of laser technology and nonlinear optics, can solve the problems of difficult manufacturing process, cumbersome adjustment steps and high production cost, and achieve the effects of low cost, compact structure and high pulse energy

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

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Problems solved by technology

[0004] In order to solve the system cost and complexity problems involved in active Q-switching in traditional methods (such as acousto-optic Q-switching, electro-optic Q-switching technology), semiconductor saturable absorber mirror (SESAM), carbon nanotube (SWNT) and graphene Q-switching technology Existing problems such as difficult manufacturing process, high production cost, cumbersome adjustment steps, etc., the present invention adopts a solution based on rare earth-doped optical fiber and fiber Bragg grating to realize full optical fiber of the laser, without additional modulation devices, greatly reducing the loss of the resonant cavity, Realize ultrashort pulse laser output with high stability, high power, high energy and high efficiency by controlling the doping concentration, gain fiber core diameter and length of rare earth-doped fiber

Method used

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  • All-fiber pulse laser utilizing cross modulation of resonant cavities
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  • All-fiber pulse laser utilizing cross modulation of resonant cavities

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Effect test

Embodiment 1

[0033] A resonator cross-modulated all-fiber pulsed laser structure such as figure 1shown. 1 in the figure is the pump source, which can be a semiconductor laser diode with a center wavelength of 976nm; 2 is a fiber beam combiner, which can be a (2+1)×1 pump signal combiner, such as 6 / 125 or 20 / Type 125; 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 selected; 5, 6, 7, and 8 are reflective fiber Bragg gratings, and high-inversion and partial reflection gratings are optional. The rate is R, where 0<R<1; 9 is an optical isolator, and a polarization-independent optical isolator is optional.

[0034] The pump light enters the second gain fiber 4 through the pump end of the fiber combiner 2, and then reaches the fourth reflective fiber Bragg grating 8, which is a high inversion grating, that is, the reflectivity R, R≥99 %, almost all the light at this central wavelength will ...

Embodiment 2

[0036] A resonator cross-modulated all-fiber pulsed laser structure such as figure 2 shown. 1 in the figure is the pump source, which can be a semiconductor laser diode with a center wavelength of 976nm; 2 is a fiber beam combiner, which can be a (2+1)×1 pump signal combiner, such as 6 / 125 or 20 / Type 125; 3 and 4 are rare-earth-doped optical fibers, and high-performance ytterbium-doped optical fibers and samarium-doped optical fibers produced by Nufern Corporation of the United States can be selected; 5 and 8 are reflective fiber Bragg gratings, and high-inversion and low-inversion gratings are optional. The rate is R, where 0<R<1; 9 is an optical isolator, a polarization-independent optical isolator is optional, 0 is a total reflection mirror, and a gold mirror is optional.

[0037] The pump light enters through the pump end of the fiber combiner 2, passes through the second gain fiber 4, and reaches the fourth reflective fiber Bragg grating (FBG) 8, which is of high inver...

Embodiment 3

[0039] A resonator cross-modulated all-fiber pulsed laser structure such as image 3 As shown, the basic structure is the same as figure 1 Similarly, the positions of the second reflective fiber Bragg grating 6 and the third reflective fiber Bragg grating 7 are exchanged.

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Abstract

The invention discloses an all-fiber pulse laser utilizing cross modulation of resonant cavities, and belongs to the fields of laser technologies and nonlinear optics. The all-fiber pulse laser mainly comprises a pumping source (1), a fiber combiner (2), a wavelength division multiplexer (2'), a first gain fiber (3), a second gain fiber (4), reflection type fiber Bragg gratings (5)(6)(7)(8), an optical isolator (9), a total reflector (0), a circulator (10), a filter (11) and an optical fiber coupler (12). According to the all-fiber pulse laser, an optical fiber doped with a rare earth element is taken as a gain medium and a saturable absorber and is of an all-fiber structure, and has the characteristics of high stability, high power, high energy and high efficiency. The all-fiber pulse laser is different from acousto-optic, electro-optic, semiconductor saturable absorber mirror (SESAM) and graphene (Graphene) Q modulation and mode-locking techniques, pulse modulation is directly carried out by utilizing the gain fiber, so that the all-fiber pulse laser is simple in design, compact in structure and cost-saving, and meanwhile, through the dual-cavity structural design utilizing the cross modulation effect of the resonant cavities, stability of system output is effectively improved.

Description

technical field [0001] The invention discloses a resonant cavity cross-modulated all-fiber pulse laser, which belongs to the field of laser technology and nonlinear optics. Background technique [0002] Fiber lasers have many advantages such as high efficiency, high power, high beam quality, compact structure, low cost, good heat dissipation, and easy maintenance, and have attracted widespread attention. Pulsed lasers with high output power, high beam quality, and high stability play an important role in the laser field, especially Q-switched and mode-locked fiber lasers can generate high-frequency ultrashort pulses in laser processing, communication sensing, It has broad prospects in many fields such as detection and diagnosis, biomedicine, and military affairs. [0003] In the research of pulsed lasers, mode-locked lasers can generate ultrashort pulses (femtosecond or picosecond pulse width), and Q-switched lasers can also achieve laser (giant pulse) output with nanosecon...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/082
Inventor 王璞金东臣师红星
Owner BWT BEIJING
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