为基于反射式衍射光栅实现多波长光束阵列光谱合成, 采用自研的镀金膜反射式衍射光栅作为色散元件, 对两束波长分别为1064 nm和1080 nm的单模光纤激光束进行光谱合成, 探索了合成系统的光学结构和光束质量等方面的优化措施, 实现了合成功率为13.64 W、合成效率为91.9%及合成光束质量为1.53的高亮度输出, 并对色散面内的光束质量退化及其影响因素进行了评估。

To achieve spectral combining of multiple-wavelength beam array based on reflective diffraction grating, a home-made reflective diffraction grating coated with gold film is used as a dispersion element to achieve spectral combining of two single-mode laser beams with wavelength of 1064 nm and 1080 nm. The structure of the combination system and the optimization method for the beam quality are studied. The combined power of 13.64 W, combined efficiency of 91.9% and combined beam quality of 1.53 are achieved. The beam quality degradation and its influence factors in dispersion plane are estimated.