利用声波控制超短脉冲的色散
Arbitrary dispersion control of ultrashort optical pulses with acoustic waves
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摘要: 声光互作用器件声光可编程色散滤波器（AOPDF）是一种实时的色散补偿器件，它可用于飞秒啁啾脉冲放大系统。通过耦合模理论推导，得到了输出脉冲的群延迟与调制声波的频率、啁啾、带宽等参数的关系，并且对用2.5cm长的LiNbO3作为声光晶体的AOPDF补偿飞秒光脉冲的色散进行了数值模拟，得到了对中心波长为800 mm的钛宝石飞秒激光色散补偿特性及所需声波的频率和啁啾参数。
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关键词:
- 声光可编程色散滤波器 /
- 色散补偿 /
- 布喇格相位匹配条件
Abstract: Acousto-optic programmable filters (AOPDF) can compensate in real time for groupdelay dispersion. This feature can be used in femtosecond chirped-pulse amplification to compensate dispersion adaptively. An analytical expression relating the group delay at the output of the AOPDF to the input acoustic signal was obtained with coupled-wave theory in the case of collinear bulk acousto-optic interactions. Numerical simulations in the LiNbO3 crystal are shown to support the principle of arbitrary group-delay control with an AOPDF. -
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