Angular dispersion and temporal change of femtosecond pulses from misaligned pulse compressors
Angular dispersion and temporal change of femtosecond pulses from misaligned pulse compressors
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DOI：
10.1109/jstqe.2003.822917
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发表时间：
2004-01-01
影响因子：
4.9
通讯作者：
Csatári, M
中科院分区：
文献类型：
--
作者：
Osvay, K;Kovács, AP;Csatári, M
啁啾脉冲放大激光器中的未对准展宽器或压缩器将残余角色散引入光束中，导致脉冲的时间失真。我们证明了成像光谱仪能够测量的激光束的角色散的精度为0.2 murad/min。使用这种技术，失调棱镜和光栅压缩器的残余角色散的解析表达式的实验证明。通过测量16 fs脉冲的时间展宽，研究了角色散引起的短脉冲的时间退化，同时也讨论了对比度退化问题。实验证明，角色散和脉冲宽度的同时测量是棱镜和光栅压缩器最精确的对准方法。
A misaligned stretcher or compressor in a chirped pulse amplification laser introduces residual angular dispersion into the beam, resulting in temporal distortion of the pulse. We demonstrate that an imaging spectrograph is capable for Measuring the angular dispersion of a laser beam by an accuracy of 0.2 murad/min. Using this technique, the analytical expressions of residual angular dispersion of misaligned prism and grating compressors are experimentally proved. Temporal degradations of short pulses due to angular dispersion are studied by measuring the, temporal stretch of 16-fs pulses, while the issues of contrast deterioration are also discussed. It is proved that the simultaneous; measurement of angular dispersion and pulse duration offers the most precise alignment procedure of prismatic and grating compressors.