Fiber laser asymmetric compensation spectral synthesizing device

Abstract

The invention provides a fiber laser asymmetric compensation spectral synthesizing device, which comprises a fiber laser array, a converging lens and two diffraction gratings. The fiber laser array, arranged in parallel, uses the converging lens to collimate the outgoing laser beams and relies on the two diffraction gratings with different linear densities to compensate the angular deflection of the converging lens to different wavelength laser beams. The invention has the advantages of low requirement for the laser line width and the diffraction grating damage threshold, of a strong ability to expand the number of channels and of producing high quality beams. With the device, it is possible to greatly enhance the brightness of the outputted laser from a spectral synthesizing system.

Description

technical field [0001] The technical field of laser synthesis of the present invention specifically relates to a spectrum synthesis device, which is mainly used for synthesizing lasers of different wavelengths output by multiple fiber lasers into a beam of lasers, improving the brightness of the output lasers of the system, and is suitable for application in the field of high-power lasers. Background technique [0002] With the development of science and technology and economic growth, in the fields of industrial manufacturing and national defense, there are increasingly higher requirements for the brightness, reliability, efficiency and volume weight of laser systems. Fiber lasers have the characteristics of compact structure, good beam quality, high electro-optical efficiency, and strong heat dissipation capabilities, and are gradually replacing other types of lasers in the field of high-brightness laser applications. [0003] However, the improvement of the brightness of ...

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Problems solved by technology

The first is the single-grating spectral synthesis scheme. Its main disadvantage is that the beam quality of the synthesized laser will deteriorate with the broadening of the laser line width. Therefore, the line width requirements of high-power fiber lasers are too high, and it is difficult to achieve high power and high beam quality. synthesis

The second is the dual-grating spectral synthesis scheme. Its main disadvantage is that each laser beam must be collimated and incident on the first grating in parallel. If the laser beam radius is too large, the system will be bulky, and if the laser beam radius is too small, it will cause The power density on the second grating is too high, making it difficult to combine high power and high beam quality

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