High-power all-fiber MOPA structure superfluorescence fiber light source based on tandem pumping

Abstract

The invention discloses a high-power all-fiber MOPA structure superfluorescence fiber light source based on tandem pumping. The high-power all-fiber MOPA structure superfluorescence fiber light source comprises a superfluorescence seed light source, a power preamplifier and a tandem pumping power main amplifier, wherein the superfluorescence seed light source comprises a first residual pumping light decanter, a first side pump beam combiner, a first multimode pumping laser, a first double-clad ytterbium-doped fiber, a second side pump beam combiner, a second residual pumping light decanter, a first fiber isolator and a second fiber isolator; the power preamplifier comprises a first (N+1)*1 fiber pumping signal beam combiner, a second multimode pumping laser, a second double-clad ytterbium-doped fiber, a second residual pumping light decanter and a third fiber isolator; and the tandem pumping power main amplifier comprises a second (N+1)*1 fiber pumping signal beam combiner, a tandem pumping laser module, a third double-clad ytterbium-doped fiber, a third (N+1)*1 backward pumping signal beam combiner, a fourth residual pumping light decanter and a fiber output end cap. The high-power all-fiber MOPA structure superfluorescence fiber light source based on the tandem pumping realizes output of a high-brightness superfluorescence fiber light source.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a high-power all-fiber MOPA structure superfluorescent fiber light source based on co-band pumping. Background technique [0002] Fiber lasers have the advantages of high conversion efficiency, good beam quality, compact structure, and easy maintenance, and are widely used in scientific research, industrial processing, and other fields. At present, most high-power fiber lasers adopt the MOPA structure with multi-stage amplification chains, and the seed source is a semiconductor laser or a fiber laser with an oscillatory cavity structure. Since the output of semiconductor lasers and fiber lasers with oscillatory cavity structures has relaxation oscillation characteristics and weak mode-locking phenomenon, pulses with high peak power are prone to appear in the process of high-power amplification, making nonlinear effects such as stimulated Raman scattering very easy to occur , may ...

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Problems solved by technology

[0004] At present, the high-power superfluorescent fiber light source mainly uses a semiconductor laser to directly pump a rare earth doped fiber to realize the generation and amplification of superfluorescence, which has serious disadvantages such as thermal effects and nonlinear effects (Xiang Peng, Liang Dong. Temperature Dependence of Ytterbium-doped Fiber Amplifiers[J].J.Opt.Soc.Am.B,2008,25(1):126~130; Nathan A.Brilliant, Kalliroi Lagonik.Thermal Effects in a Dual-clad Yetterbium Fiber Laser[J].OPT .Lett,2001,26(21):1669~1671)

In addition, the brightness of existing semiconductor laser pumping sources is limited, and it is difficult to continue to improve (C.A. Codemard, J. Nilsson, and J.K. Sahu. Tandem Pumping of Large-core Double-clad Ytterbium-doped Fiber for Control of Excess Gain[C] .Advanced Solid State Photonics,2010 OSA Technical Digest Series:paper.AWA3)

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