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建立了由掺Yb光纤激光器阵列、变换透镜、闪耀光栅和输出耦合镜组成的光束谱合成系统的光束传输模型.在考虑光栅角色散、光栅刻槽倾角误差和光栅衍射效率情况下,利用光线追迹法、衍射积分方法、光束非相干叠加原理和强度二阶矩方法,推导出高斯光束非平行倾斜入射到闪耀光栅的相位变化公式以及谱合成光束的光强分布解析表达式.分析了高斯光束非平行倾斜入射到光栅后,光栅角色散、光栅衍射效率和光栅刻槽倾角误差对掺Yb光纤激光器谱合成系统输出光束特性的影响.研究结果表明,谱合成光束具有与单根光纤激光器几乎相同的光束质量;光栅角色散对合成光束特性的影响可忽略;随着光栅刻槽倾角误差的增大,谱合成光束的光束质量明显变差;当光栅刻槽倾角误差较大时,必须考虑光栅衍射效率对合成光束特性的影响.
A beam propagation model of a light beam synthesis system consisting of a Yb-doped fiber laser array, a translating lens, a blazed grating and an output coupling mirror is established.With the consideration of grating angle dispersion, grating groove inclination error and grating diffraction efficiency, Trace, diffraction integral method, principle of non-coherent beam superposition, and second-order intensity method, the phase change formula of non-parallel oblique incidence of blazed grating on Gaussian beam and the analytic expression of light intensity distribution of spectral synthesized beam are deduced.The Gaussian beam The effects of grating angle dispersion, grating diffraction efficiency and grating groove tilt angle on the output beam characteristics of the Yb-doped fiber laser synthesizer are analyzed after the non-parallel tilt incident on the grating.The results show that the spectral synthesized beam has almost the same as the single fiber laser Of the beam quality; the dispersion of the grating angle has a negligible effect on the characteristics of the synthesized beam; the beam quality of the spectrally synthesized beam is significantly degraded as the grating groove tilt error increases; and when the grating groove tilt error is large, the grating must be considered Effect of Diffraction Efficiency on the Properties of Synthetic Beam.