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All-fiber single-frequency pulse laser

A pulsed laser and single-frequency laser technology, applied in the field of lasers, can solve problems such as poor environmental stability, mechanical damage to optical fibers, and sensitivity to applied stress, and achieve the effect of improving stability, overcoming the limitation of working wavelength, and avoiding strict requirements.

Pending Publication Date: 2022-05-27
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the method of periodically modulating the loss in the laser cavity based on suppressing the birefringence effect is the most widely used, but this technology relies on applying periodic mechanical stress to the fiber, which is likely to cause mechanical damage to the fiber itself under long-term laser operation, and the laser pulse The modulation effect is more sensitive to the applied stress, resulting in poor environmental stability of the technical solution

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Embodiment 1

[0042] The embodiment of the present invention provides an all-fiber single-frequency pulsed laser, the laser includes: a pump source 1, a first wavelength division multiplexer 2, a first high-reflection fiber grating 3, an erbium-doped fiber 4, a first low The reflectivity fiber grating 5 , the second wavelength division multiplexer 6 , the thulium-doped fiber 7 , and the second low reflectivity fiber grating 8 .

[0043] Among them, the pump source 1 is a single-mode fiber-coupled semiconductor laser with a center wavelength of 980nm; the first wavelength division multiplexer 2 is a 980nm / 1550nm wavelength division multiplexer; the center wavelength of the first high-reflection fiber grating 3 is 1550nm, the reflectivity is >99%, the reflection bandwidth is 0.3nm; the absorption coefficient of the erbium-doped fiber 4 at 980nm is 100dB / m, and the length is 2.5cm; the center wavelength of the first low-reflection fiber grating 5 is 1550nm, and the reflectivity is 60%, and the...

Embodiment 2

[0048] The embodiment of the present invention provides an all-fiber single-frequency pulsed laser, the laser includes: a pump source 1, a first wavelength division multiplexer 2, a first high-reflection fiber grating 3, an erbium-doped fiber 4, a first low The reflectivity fiber grating 5 , the second wavelength division multiplexer 6 , the third low reflectivity fiber grating 7 , the thulium-doped fiber 8 , the second high reflectivity fiber grating 9 and the second low reflectivity fiber grating 10 .

[0049] Among them, the pump source 1 is a single-mode fiber-coupled semiconductor laser with a center wavelength of 980nm; the first wavelength division multiplexer 2 is a 980nm / 1550nm filter-type wavelength division multiplexer; the center of the first high-reflection fiber grating 3 The wavelength is 1550nm, the reflectivity is >99%, and the reflection bandwidth is 0.3nm; the absorption coefficient of the erbium-doped fiber 4 at 980nm is 40dB / m, and the length is 0.5m; the c...

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Abstract

The invention discloses an all-fiber single-frequency pulse laser, which is characterized in that an active fiber which is introduced into a composite cavity structure and has a laser wavelength absorption characteristic is used as a saturable absorber, so that ultra-narrow-band filtering and all-fiber passive Q-switching are realized, and a single-frequency pulse all-fiber laser oscillator is obtained. According to the invention, while the frequency selection capability of the resonant cavity is enhanced, the strict requirement of single-frequency laser on the cavity length of the composite cavity is reduced, and the operation stability of a laser single longitudinal mode is improved, periodically changing cavity loss is introduced, all-fiber passive Q-switching is realized, and a single-frequency pulse all-fiber laser oscillator is obtained; the problems that an existing single-frequency pulse fiber laser is limited in working wavelength, low in laser power level and the like are solved.

Description

technical field [0001] The invention relates to the field of lasers, in particular to an all-fiber single-frequency pulsed laser. Background technique [0002] Single-frequency pulsed fiber lasers have important application requirements in the fields of coherent radar, laser remote sensing, and nonlinear optical frequency conversion due to their narrow linewidth, high beam quality, high system integration, and maintenance-free advantages. The generation methods of single-frequency pulsed laser can be mainly divided into two types: external modulation and internal modulation. The external modulation method can drive single-frequency semiconductor lasers by electrical pulse signals, gain switching technology of short-cavity single-frequency fiber lasers pumped by optical pulses, and use active Q-switching devices such as acousto-optic or electro-optical devices to realize the transformation of single-frequency lasers from continuous wave operation to Pulse operation. However...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/10
CPCH01S3/0675H01S3/10023Y02A90/10
Inventor 付士杰史伟盛泉李岩岩史朝督张露姚建铨
Owner TIANJIN UNIV
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