基于衍射光学元件的激光相干合成研究进展

从衍射光学元件的基本原理出发,围绕连续波和脉冲波两大应用领域,综述了国内外基于衍射光学元件实现共孔径相干合成的研究进展。在国内,上海光学精密机械研究所分别实现了连续光和脉冲光的合成,连续光实现了206 W的输出功率,光束质量1.38,合束效率29.6%;脉冲光实现了峰值功率1.02 kW,重复频率2.2 MHz的ns级脉冲相干合成光束,合束效率61%。在国外,连续光方面实现了5 kW量级的合成光输出,合束效率82%;脉冲光方面实现了平均功率150 mW,重复频率100 MHz的fs级脉冲相干合成光束,合束效率83.4%。最后对基于衍射光学元件的激光相干合成技术的未来发展做出了展望,相信在不久的将来,基于衍射光学元件的相干合成技术会不断发展,逐渐突破技术瓶颈,从而为更多的应用领域奠定坚实基础。

Coherent beam combining of fiber laser array based on diffractive optical element

This article summarizes the research progress of common aperture coherent beam combining based on diffraction optical elements domestically and abroad, starting from the basic principles of diffraction optical elements, and focusing on the two application fields of continuous waves and pulsed waves. Domestically, the Shanghai Institute of Optics and Fine Mechanics has achieved the synthesis of both continuous and pulsed light. Continuous light output of 206 W was achieved with a beam quality of 1.38 and a beam combining efficiency of 29.6%; pulsed light output of a nanosecond-level pulse coherent combining beam with a peak power of 1.02 kW and a repetition frequency of 2.2 MHz was achieved, beam combining efficiency is 61%. Abroad, 4.9 kW coherent beam combining output has been achieved in continuous light, with a beam coupling efficiency of 82%; in the case of pulsed light, a femtosecond-level pulsed coherent beam combining beam with an average power of 150 mW and a repetition frequency of 100 MHz has been achieved, with a beam coupling efficiency of 83.4%. Finally, the future development of laser coherent beam combining technology based on diffraction optical elements is discussed, and it is believed that in the near future, diffraction optical element-based coherent beam combining technology will continue to develop, gradually break through technical bottlenecks, and lay a solid foundation for more application fields.