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Optical fiber laser amplifying system and dynamic amplitude and spectrum modulating method thereof

An amplification system, fiber laser technology, applied to lasers, laser parts, phonon exciters, etc., can solve problems such as high draw ratio, high third-order dispersion, and difficult pulse recompression, and achieve simple structure and high-quality optical fiber The effect of laser output

Pending Publication Date: 2018-10-12
JILIN YONGLI LASER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High power laser systems require higher draw ratios, resulting in higher third order dispersion
Therefore, for high-power laser systems, it is more difficult to recompress the pulse to the original pulse width, and this difficulty is often referred to as the compressibility problem

Method used

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  • Optical fiber laser amplifying system and dynamic amplitude and spectrum modulating method thereof
  • Optical fiber laser amplifying system and dynamic amplitude and spectrum modulating method thereof
  • Optical fiber laser amplifying system and dynamic amplitude and spectrum modulating method thereof

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specific Embodiment approach 1

[0082] Implementations of fiber-based acousto-optic dispersion shapers can be classified into many different configurations. Acousto-optic dispersion shapers typically operate in low-intensity regions. refer again figure 1 , an acousto-optic dispersion shaper implemented as a pulse shaper in combination with a fiber stretcher, an all-fiber high-energy amplifier, and a grating compressor. In this configuration, an acousto-optic dispersion shaper is used to compensate the third-order dispersion in the fiber stretcher and grating compressor. It is necessary to use single-mode fiber pigtails in the low-intensity region of the AOD shaper, since many AOB birefringent materials can handle relatively high power, it is very attractive to use medium-power or high-power AOD shapers . In this embodiment, the optical fiber pigtail acousto-optic dispersion shaper is applied. The optical fiber with the pigtail is not necessarily a single-mode optical fiber. It can be a large-mode-field op...

specific Embodiment approach 2

[0084] like Image 6 As shown, in this embodiment, a conventional fiber amplifier, an acousto-optic dispersion shaper and a PBF compressor are used, the input fiber is a passive large-mode-field fiber matched with the output fiber of the fiber amplifier, and the output fiber is a photonic bandgap fiber for pulse compression. The above configuration is used to realize a short pulse amplification system based on chirped pulse amplification based on all-fiber. Phase correction of pulses produced by conventional fiber amplifiers and PBF compressors for pulse compression. The acousto-optic dispersion shaper is placed after the amplifier, and before the PBF compressor, the acousto-optic dispersion shaper is used for higher-order dispersion correction, and the spectral width can be less than 30fs.

specific Embodiment approach 3

[0085] like Figure 7 Shown, in the present embodiment, use conventional amplifier, acousto-optic dispersion shaper and compressor, input fiber is the small photonic crystal fiber that is used for spectral broadening, and it can expand the spectrum to 200nm bandwidth easily; Output fiber can be used A photonic bandgap fiber for power transfer, or it could be a free-space output. The amplified and compressed laser pulses can be sent to a photonic crystal fiber, where the phase is modulated to broaden the spectrum; the spectrally broadened pulses are propagated in an acousto-optic dispersion shaper, which then compensates for the additional dispersion. The key component is a well-designed acousto-optic dispersion shaper with wide acoustic bandwidth that can handle very wide bandwidth (200nm). In the simulation analysis experiment, for 200nm controlled spectral width, the pulse duration can be as short as 7fs. Therefore, all-fiber laser sources can deliver high-energy pulses wi...

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Abstract

The invention discloses an optical fiber laser amplifying system and a dynamic amplitude and spectrum modulating method thereof,and relates to the field of optical fiber laser devices. The optical fiber laser amplifying system comprises a laser pump,a stretcher,a pulse reshaper,an amplifier and a compressor; the laser pump generates pump light,the pump light is emitted into the stretcher,and the stretcher stretches the pump light to generate a laser pulse with a stretched pulse width; the laser pulse is projected into the pulse reshaper,and the pulse reshaper reshapes the laser pulse through dynamic amplitude and spectrum modulating and projects the laser pulse into the amplifier; the amplifier amplifies the power of the reshaped laser pulse,and projects the laser pulse into the compressor,so that the pulse width of the laser is compressed to output laser with an original pulse width. By means of the optical fiber laser amplifying system and the dynamic amplitude and spectrum modulating method thereof,through the acousto-optic dispersion reshaper,the shape and phase of the spectrum are randomly modulated,and different dispersion levels are controlled to be generated with the controllable amplitude. The stretcher achieves pulse broadening and the amplifier amplifies the laser power so that a high-quality,compact and reliable optical fiber laser system can be implemented.

Description

technical field [0001] The invention relates to the technical field of fiber lasers, in particular to a fiber laser amplification system and a dynamic amplitude and spectrum modulation method thereof. Background technique [0002] Although the current fiber laser technology has made significant progress in realizing compact lasers with increasing output power, the use of common means still faces technical limitations and difficulties. Specifically, chirped pulse amplification techniques can be used in fiber laser systems to achieve power increases. For short-pulse high-power laser amplifiers, the third-order dispersion limits the scalability of lasers and limits the development of chirped pulse amplification technology. Conventional solid-state lasers, which utilize grating-lens combinations and compressors for pulse stretching and compression, do not address these limitations. Ideally, in such a solid-state laser, all orders of dispersion could be compensated, but the dis...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/00
CPCH01S3/0057H01S3/06754
Inventor 孙尚勇张双翼张萍于杨花明
Owner JILIN YONGLI LASER TECH
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