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All-fiber passive Q-switched pulsed fiber laser

A fiber laser, pulsed laser technology, applied in the field of laser technology and fiber, can solve the problems of unstable performance, unsuitability, low optical uniformity and low light damage threshold, achieve compact structure, improve energy density, and improve bleaching switching capability Effect

Pending Publication Date: 2017-09-19
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional passive absorption devices for 10XX band lasers include Cr:YAG (chromium-doped ytterbium aluminum garnet) crystals, GaAs gallium arsenide crystals, and SESAM (semiconductor saturable absorber), etc., but these crystals themselves are spatially discrete devices, and at the same time There are disadvantages such as optical uniformity or low light damage threshold, so it is not suitable for fiber laser modulation
Recently, the saturable absorption fiber doped with Sm, Tm and other elements newly developed by researchers is not suitable for the needs of industrial pulsed fiber lasers due to unstable performance and other reasons.

Method used

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  • All-fiber passive Q-switched pulsed fiber laser
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  • All-fiber passive Q-switched pulsed fiber laser

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Embodiment 1

[0026] Such as figure 1 As shown, the first embodiment is a 10xxnm all-fiber passive Q-switched pulsed fiber laser, including: 9xxnm (915nm, 920nm, 940nm, 950nm, 980nm, etc.) pump source (Pump LD) 1, pump beam combiner ( PBC) 2, the first reflector 11 of the first resonant cavity, the second reflector 12 of the first resonant cavity, the first reflector 21 of the second resonant cavity, the second reflector 22 of the second resonant cavity, the doping of the first resonant cavity Gain fiber 10 , second cavity doped gain fiber 20 and mode field matcher (MFA) 30 . Wherein, the pump source (Pump LD) 1 fiber output end is connected to the pump end of the pump beam combiner (PBC) 2, and the signal output end of the pump beam combiner is connected to one end of the first resonant cavity doped gain fiber 10, The other end of the first resonator-doped gain fiber 10 is connected to the second reflector 12 of the first resonator; the signal input end of the pump beam combiner is then c...

Embodiment 2

[0042] The second embodiment includes all the technical features in the first embodiment, and the difference is that the first resonator-doped gain fiber and the second resonator-doped gain fiber in the second embodiment both use erbium-ytterbium co-doped double-clad fibers, Wherein the first resonator-doped gain fiber 10 is Nufern 10 / 125 erbium-ytterbium co-doped double-clad fiber, the second resonator-doped gain fiber 20 is Nufern 6 / 125 erbium-ytterbium co-doped double-clad fiber, and the The wavelength of the laser with the first wavelength in the first resonant cavity is 1535 nm, and the corresponding laser with the second wavelength in the second resonant cavity has a wavelength of 1650 nm.

[0043] In other embodiments, the first resonator-doped gain fiber and the second resonator-doped gain fiber can also be single-clad, double-clad or multi-clad active fibers doped with rare earth elements such as thulium-doped fiber.

Embodiment 3

[0045] Such as figure 2 As shown, the second embodiment includes all the technical features of the first embodiment. The difference is that the pumping structure in this embodiment is a bidirectional pumping structure in which two pumping directions exist simultaneously, and another pumping source 3 and Another pump beam combiner 4, the two pump sources and the pump beam combiner form the bidirectional pumping of the first resonant cavity doped gain fiber, and the pump light wavelength and power of the two pump sources are the same or different.

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Abstract

The present invention relates to an integrated all-fiber passive Q-switched pulsed fiber laser. The integrated all-fiber passive Q-switched pulsed fiber laser is realized through an in-band pumping mode and on the basis of the dual-cavity coupling principle. The working wave bands of resonant cavities are reasonably designed on the basis of full utilization of the characteristics of the wide absorption bandwidth and transmission bandwidth of doped gain fibers and the large cross and overlapping range of the wide absorption bandwidth and transmission bandwidth; the gain function and saturation absorption function of laser radiation are realized in the doped gain fibers; the radiated laser of a first resonant cavity is utilized to pump a second resonant cavity; the integrated all-fiber passive Q-switched pulsed fiber laser is realized through the coupled cavity; and the core diameter of the fiber core of a second resonant cavity doped gain fiber and the core diameter of the fiber core of a first resonant cavity fiber doped gain fiber are different, and therefore, the energy density of laser in the second resonant cavity doped gain fiber is improved, and the bleaching and switching capability of a passive saturable absorber can be improved. The pulsed fiber laser of the invention has the advantages of compact structure and stable performance. The all-fiber-based performance of the pulsed fiber laser can be realized truly.

Description

technical field [0001] The invention relates to the fields of laser technology and optical fiber technology, in particular to an all-fiber passive Q-switched pulse fiber laser. Background technique [0002] As we all know, fiber laser has been widely concerned and welcomed by industrial users due to its unique integrated integration, good beam quality, stable performance, high efficiency, large heat dissipation area, long life and easy mass production. Fiber lasers have achieved rapid development and popularization, and have been widely used in consumer electronics, new energy, biomedicine, laser microprocessing and other fields. [0003] At present, the pulsed fiber lasers widely used in the industry are basically active Q-switched fiber lasers. Fiber-coupled acousto-optic modulation devices (spatial acousto-optic devices) are used as optical switches, which are connected to the fiber laser resonator to modulate the intracavity loss of the laser. Realize the pulse output o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/08
CPCH01S3/067H01S3/06729H01S3/08
Inventor 卓壮
Owner SHANDONG UNIV
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