Femtosecond pulse shaping for Dammann-type filters
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摘要: 为了研究飞秒激光时空变换整形技术,采用理论分析与计算机模拟结合讨论的方法,分析了以达曼类滤波器为模板的4f 系统的飞秒脉冲整形技术。以梯度算法优化设计出达曼类滤波器,包括等间距、等强度和不等间距、不等强度达曼光栅,并模拟讨论了产生的超快时域多脉冲与光谱平面上调制周期的重复数、元件间距不等效应和波长效应的影响。结果表明,以达曼类滤波器为模板的飞秒脉冲整形中,模板周期重复数越多,输出脉冲的质量越高;元件间距不等和波长效应使输出脉冲的平均度和衍射效率都有所降低。Abstract: In order to study how to shape femtosecond pulses with space-time conversion technique,combining theoretical analysis with computer simulation,femtosecond pulse shaper of 4f system applying Dammann-type filters as mask was analyzed. Firstly,Dammann-type filters including equally-spaced and equal-intensity gratings and unequally-spaced and equal-intensity gratings were designed with gradient algorithm. Then,the relation among the generated multiple ultrafast temporal pulses,the periodic repetition number,the spacing between the components and the wavelength in the spectral plane was discussed. The results showed that the perfect uniformity of the output pulse trains was strongly affected by the number of periodic repetition number. The efficiency and uniformity of the resultant output pulses became lower because of the spacing between the components and the wavelength effect.
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