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System and method for suppressing stimulated Brillouin scattering effect in high-power narrow-linewidth optical fiber laser amplifier

A technology of stimulated Brillouin and fiber laser, applied in the direction of laser scattering effect, laser, laser parts, etc., to achieve the effect of ensuring beam quality output, high beam quality output, and preventing optical discharge

Active Publication Date: 2020-08-21
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

At present, the stimulated Brillouin scattering effect is one of the core factors limiting its power improvement

Method used

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  • System and method for suppressing stimulated Brillouin scattering effect in high-power narrow-linewidth optical fiber laser amplifier
  • System and method for suppressing stimulated Brillouin scattering effect in high-power narrow-linewidth optical fiber laser amplifier
  • System and method for suppressing stimulated Brillouin scattering effect in high-power narrow-linewidth optical fiber laser amplifier

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Embodiment 1

[0038] as attached figure 1 As shown, this embodiment provides a system for suppressing the stimulated Brillouin scattering effect in a high-power, narrow-linewidth fiber laser amplifier, including: a single-frequency laser 1, a phase modulation system 2, a cascaded fiber pre-amplifier 3, an optical fiber Main amplifier 4, cladding optical filter 5, fiber end cap 6. Wherein, the phase modulation system 2 includes an industrial computer 2-1, an arbitrary waveform generator 2-2, an electrical high-voltage amplifier 2-3 and a phase modulator 2-4. The main fiber amplifier 4 includes a pump source 4-1, a pump-signal combiner 4-2, and a gain fiber 4-3.

[0039] The single-frequency laser output from the single-frequency laser 1 is first injected into the phase modulation system 2, and the output spectrum of the single-frequency fiber laser is properly broadened to achieve the purpose of suppressing the stimulated Brillouin scattering effect. The phase modulation system 2 includes ...

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Abstract

The invention provides a system and a method for inhibiting a stimulated Brillouin scattering effect in a high-power narrow-linewidth optical fiber laser amplifier. According to the system, single-frequency laser output by a single-frequency laser device in a high-power narrow-linewidth optical fiber laser amplifier is subjected to phase modulation, wherein the adopted phase modulation signal is phi f (t), phi f (t) is rem (phi (t) / 2pi), single-frequency laser spectrum broadening is achieved, and the purpose of restraining the stimulated Brillouin scattering effect is achieved. Compared with the existing white noise signal modulation and pseudo-random phase encoding modulation, the method of the invention has the following characteristics that efficient stimulated Brillouin scattering suppression can be achieved, and theoretical basis and technical support are provided for further power improvement of a high-power and narrow-linewidth optical fiber laser system.

Description

technical field [0001] The invention belongs to the field of fiber laser technology, and in particular relates to a system and method for suppressing the stimulated Brillouin scattering effect in a high-power, narrow-linewidth fiber laser amplifier. Background technique [0002] High-power, narrow-linewidth fiber laser has important applications in beam combining, laser frequency conversion, laser communication and other fields. At present, the stimulated Brillouin scattering effect is one of the core factors limiting its power improvement. As a typical nonlinear effect, stimulated Brillouin scattering occurs in the process of mutual coupling of signal light field, Stokes light field and acoustic wave field in optical fiber. [0003] For the stimulated Brillouin scattering effect, researchers at home and abroad have proposed a variety of suppression methods, mainly including the use of large-mode-field high-doped gain fibers, the application of temperature and stress gradie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/10H01S3/30
CPCH01S3/06754H01S3/10053H01S3/302
Inventor 马鹏飞来文昌黄龙王涛宋家鑫刘伟姜曼李灿粟荣涛吴坚马阎星周朴
Owner NAT UNIV OF DEFENSE TECH
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