Cascade pumping optical fiber laser based on double-ended output oscillators

A fiber laser and cascade pumping technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of low laser efficiency and achieve the effect of improving utilization efficiency

Pending Publication Date: 2020-02-21
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The general double-ended pump fiber laser adopts fiber-coupled semiconductor laser or short-wavelength fiber laser with single-ended output. The residual pump light output from the backward or forward beam combiner will be injected into the fiber-coupled semiconductor laser or short-wavelength laser. However, the injection into the main laser cannot be reused, resulting in a lower overall efficiency of the laser

Method used

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  • Cascade pumping optical fiber laser based on double-ended output oscillators
  • Cascade pumping optical fiber laser based on double-ended output oscillators
  • Cascade pumping optical fiber laser based on double-ended output oscillators

Examples

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Effect test

Embodiment 1

[0032] This example presents a cascaded pumped fiber laser based on a double-ended output oscillator, and its structure refers to figure 1 , the cascaded pump fiber laser includes a laser resonator, a forward pump signal combiner 5, a backward pump signal combiner 6, a cladding optical filter 7, a fiber end cap 8 and at least two double output laser oscillator 4. Both the forward pump signal combiner 5 and the backward pump signal combiner 6 in this embodiment can bidirectionally transmit signal laser light.

[0033] The laser resonator of this embodiment includes a high-reflection fiber grating 2, a gain fiber 1 and a low-reflection fiber grating 3 which are sequentially welded by optical fibers. Wherein, the operating wavelength of the gain fiber 1, the high reflection fiber grating 2 and the low reflection fiber grating 3 in the ytterbium-doped fiber laser is 1050-1150 nm. The gain fiber 1 has a double-clad or triple-clad structure. Among them, the core is doped with rar...

Embodiment 2

[0042] The structure of this embodiment is basically the same as that of Embodiment 1, except that the connection relationship between the laser resonator and the forward pump signal combiner 5 and the backward pump signal combiner 6 is different, as follows:

[0043] Each forward output optical fiber 4-10 is connected to the corresponding first pump injection arm 5-2; each backward output optical fiber 4-9 is connected to the corresponding second pump injection arm 6-2; the first signal input The arm 5-1 is connected to one end of the high-reflection fiber grating 2, and the other end of the high-reflection fiber grating 2 is welded to the power transmission fiber 9 at an angle of 8 degrees, which can avoid the parasitic oscillation of the laser caused by other optical feedback in the non-laser band. The first pump signal output arm 5-3 is connected to one end of the gain fiber 1 through the pump signal energy transmission fiber; the other end of the gain fiber 1 is connected ...

Embodiment 3

[0047] The structure of this embodiment is basically the same as that of Embodiment 1, except that: a first tilted grating 10 is arranged between each forward output optical fiber 4-10 and the corresponding first pump injection arm 5-2; A second tilted grating 11 is arranged between each backward output optical fiber 4-9 and the corresponding second pump injection arm 6-2, refer to image 3 . Both the first tilted grating 10 and the second tilted grating 11 transmit the working wavelength (1000nm-1040nm) of the double-ended output laser oscillator 4, and reflect the working wavelength (1050-1150nm) of the cascaded pump fiber laser, so as to Avoid long-wavelength laser injection causing self-excitation of the double-ended output laser oscillator 4 .

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Abstract

The invention discloses a cascade pumping optical fiber laser based on double-ended output oscillators. The cascade pumping optical fiber laser comprises a laser resonant cavity, a forward pumping signal beam combiner, a backward pumping signal beam combiner, a cladding light filter, an optical fiber end cap and at least two double-ended output laser oscillators. The forward pumping signal beam combiner comprises a first signal input arm, a first pumping signal output arm and a plurality of first pumping injection arms. The backward pumping signal beam combiner comprises a second signal inputarm, a second pumping signal output arm and a plurality of second pumping injection arms. A forward output optical fiber of each double-ended output laser oscillator is connected with the corresponding first pumping injection arm, and a backward output optical fiber of each double-ended output laser oscillator is connected with the corresponding second pumping injection arm. The first signal inputarm is welded to an energy transmission optical fiber. The first pumping signal output arm is connected with one end of the laser resonant cavity, and the other end of the laser resonant cavity is connected with the second signal input arm. According to the invention, the utilization efficiency of pump light and the overall electro-optical efficiency of the laser are improved.

Description

technical field [0001] The invention belongs to the technical field of fiber lasers and relates to a cascaded pumping fiber laser based on a dual-terminal output oscillator. Background technique [0002] Compared with the fiber laser with the main oscillation power amplification structure, the all-fiber laser oscillator has the advantages of low cost, compact structure, simple control logic, stable performance, and strong anti-reflection ability, and has been widely used in industrial processing. [0003] With the expansion of application fields, the power requirements of fiber laser oscillators are getting higher and higher. Fiber lasers with double-ended pumping can inject higher pump power, which helps to increase the overall power of fiber lasers. However, in general double-ended pump lasers, the pump source generally uses a fiber-coupled semiconductor laser as the pump source (that is, an LD directly pumps a fiber laser), or a short-wavelength fiber laser with a single...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/09
CPCH01S3/067H01S3/06758H01S3/09
Inventor 王小林周朴张汉伟奚小明史尘杨保来韩凯王泽锋许晓军司磊陈金宝
Owner NAT UNIV OF DEFENSE TECH
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