间距和角度失调对零色散飞秒整形系统的影响

Effect of mismatched spacing and angle on zero-dispersion femtosecond pulse shaping system

为了研究间距和角度失调对零色散飞秒整形时域特性的影响,理论上分析了系统的分辨率与各光学元件间距角度失调的关系,详细讨论了间距角度失调对系统效率和输出脉冲时间特性的影响。实验结果表明,透镜位置失调会导致脉冲展宽,且两个透镜位置失调对脉宽展宽的规律对称,光栅位置失调也会导致脉冲展宽。此外,器件角度失调对系统效率的影响大于位置失调。使用600线的光栅、30cm焦距的透镜,当间距失调小于0.5 cm,角度失调小于9°时可以满足系统效率变化和脉冲展宽都小于5%。该结果对更好地利用零色散整形系统具有重要指导意义。

In order to study the effect of mismatched spacing and angle of zero-dispersion femtosecond pulse shaping system on the temporal properties of the output femtosecond pulses,the relation between the resolution and the mismatched spacing of the system was analyzed in theory.And then the effect of mismatched spacing and angle on the system efficiency and the width of the output pulses were discussed.The experimental results indicated that lens misalignment can broaden the pulse,and the influences of the first and the second gratings are symmetrical.Moreover,the influence on system efficiency of angle misalignment was more serious than spacing misalignment.If 600 lines per millimeter grating and lens of 30 centimeter focal length were used,when the angle misalignment was smaller than 9°and spacing misalignment was shorter than 0.5 centimeters,the changing of system efficiency and pulse width were both smaller than 5%.All the results above are helpful to an in-depth study on the zero-dispersion pulse shaping system.