Laser amplifier and pump light two-way absorption system and method thereof
An absorption system and fiber amplifier technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of difficult laser power increase, unfavorable suppression of MI, easy generation of high-order modes, etc., to achieve laser efficiency improvement, low cost, The effect of raising the threshold
Pending Publication Date: 2021-07-23
武汉光谷航天三江激光产业技术研究院有限公司
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Problems solved by technology
[0002] The improvement of high-power narrow-linewidth fiber laser power is mainly limited by stimulated Brillouin scattering (SBS) and mode instability (MI) effects, and there is a certain contradictory relationship in the process of suppressing SBS and MI. Difficulties with increased laser power
[0003] For example, increasing the core diameter of the gain fiber can increase the SBS threshold, and it is easy to generate high-order modes, which is not conducive to suppressing MI; The absorption coefficient of light is as high as possible, but a high absorption coefficient will lower the threshold of MI
Similar inconsistencies have brought great challenges to the development of narrow linewidth lasers
Method used
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[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0039] In Embodiment 1 of the present invention, as figure 1 As shown, a double-pass absorption system for pump light of a fiber amplifier includes: a double-clad fiber 01 for transmitting pump light and signal light; The first curved fiber end cap 02; the signal light high-transmittance pump light high-reflection mirror 03 for transmitting signal light and reflecting pump light; the signal lig...
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The invention discloses a laser amplifier and a pump light two-way absorption system and method thereof. The pump light two-way absorption system comprises a double-clad optical fiber for transmitting pump light and signal light, a first curved-surface optical fiber end cap used for outputting the pump light emitted by the double-clad optical fiber in a collimation manner, a signal light high-transmittance pump light high-reflectivity mirror, a lens group for coupling the signal light, a second curved-surface optical fiber end cap used for transmitting signal light, and an optical fiber for inputting or outputting signal light. The pump light from the double-clad optical fiber is collimated and output through the first curved-surface optical fiber end cap, is reflected to the first curved-surface optical fiber end cap through the signal light high-transmittance pump light high-reflectivity mirror, and returns to the double-clad optical fiber through an original optical path; and the double-clad optical fiber, the first curved-surface optical fiber end cap, the signal light high-transmittance pump light high-reflectivity mirror, the lens group, the second curved-surface optical fiber end cap and the optical fiber are sequentially arranged to form a transmission path of the signal light. According to the invention, the SBS and MI dual promotion is realized, the laser efficiency is improved, and the contradictory relationship between the existing SBS and MI is solved.
Description
technical field [0001] The invention belongs to the technical field of optical fiber amplifiers, and more specifically relates to a laser amplifier and its pump light double-pass absorption system and method. Background technique [0002] The improvement of high-power narrow-linewidth fiber laser power is mainly limited by stimulated Brillouin scattering (SBS) and mode instability (MI) effects, and there is a certain contradictory relationship in the process of suppressing SBS and MI. Increased laser power poses difficulties. [0003] For example, increasing the core diameter of the gain fiber can increase the SBS threshold, and it is easy to generate high-order modes, which is not conducive to suppressing MI; The absorption coefficient of light is as high as possible, but a high absorption coefficient lowers the MI threshold. Similar contradictions bring great challenges to the development of narrow linewidth lasers. Therefore, how to solve the contradiction between SBS ...
Claims
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Login to View More IPC IPC(8): H01S3/067H01S3/10
CPCH01S3/06708H01S3/06754H01S3/10023
Inventor 雷敏杨雨廖明龙杨笛王天晗刘厚康武春风李强姜永亮宋祥
Owner 武汉光谷航天三江激光产业技术研究院有限公司