A diode-pumped Raman fiber laser and its spectral synthesis method

Abstract

The present invention provides a diode directly pumped Raman fiber laser and its spectral synthesis method. The scheme adopts a 9xxnm diode directly pumped Raman fiber laser as a new synthetic sub-beam, and expands the synthetic spectral width of the spectral synthesis to 900nm- 1030nm band, and then greatly expand the number of spectral synthesis sub-beams, with the development of diode directly pumped Raman fiber laser technology, and finally further effectively increase the output power of spectral synthesis. At the same time, the present invention can also be regarded as a beneficial improvement to the original diode laser spectrum synthesis technology. Through the beam purification effect of the Raman effect, the original diode laser with poor beam quality is converted into an ideal beam that can be synthesized. Combined efficiency and beam quality are improved.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a diode directly pumped Raman fiber laser and a spectrum synthesis method thereof. Background technique [0002] Spectral synthesis is the use of dispersion gratings to diffract multiple laser sub-beams of different wavelengths to the same aperture output, while maintaining good beam quality while increasing power, it is one of the effective technical ways to achieve efficient and high-quality laser beam combination. In the currently reported spectral synthesis systems based on diode lasers or solid-state lasers, the beam quality and synthesis efficiency of the synthesized beams are not ideal due to the poor beam quality of the sub-beams themselves. [0003] Thanks to the excellent beam quality and high conversion efficiency of fiber lasers, fiber laser-based spectral synthesis has developed rapidly in recent years, especially in the 1μm band based on ytterbium-doped silicon-based...

AI Technical Summary

Problems solved by technology

However, limited by the limited ytterbium-doped fiber gain spectral width (1040nm-1090nm) and the angular resolution of the beam-forming grating, the number of sub-beams for spectral synthesis cannot be expanded indefinitely. The requirements also pose a difficult challenge to the development of fiber laser beamlets (the main technical difficulties of high-power narrow-linewidth fiber beamlets focus on nonlinear effects and mode instability suppression)

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