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计算了啁啾脉冲激光放大系统中单光栅展宽器在入射角大于和小于利特罗角两种入射情况 ,发现对同一飞秒脉冲在相同展宽比条件下 ,入射角小于利特罗角时所需光栅宽度要远小于入射角大于利特罗角时所需的光栅宽度 ,且在入射角小于利特罗角时存在一最佳入射角 ,此时所对应的光栅宽度达到最小值。同时理论分析及数值计算显示 ,在上述条件下入射角小于利特罗角时此单光栅展宽器的等效光栅对间距较入射角大于利特罗角时大为缩短。
The incidences of the single grating stretcher in the chirped pulsed laser amplification system are both larger and smaller than those of Littello. The results show that for the same femtosecond pulse, the incidence angle is smaller than that of Littrow The width of the grating to be required is much smaller than the grating width required when the incidence angle is greater than the Littrow angle. When the incidence angle is less than the Littrow angle, there exists an optimal incidence angle, and the corresponding grating width reaches a minimum value. At the same time, the theoretical analysis and numerical calculation show that the equivalent raster spacing of the single grating stretcher is greatly shortened when the incidence angle is greater than the Littrow angle when the incidence angle is less than the Littrow angle under the above conditions.