Programmable amplitude- and phase-modulated femtosecond laser pulses in the mid-infrared.
Programmable amplitude- and phase-modulated femtosecond laser pulses in the mid-infrared.
复制标题
中红外可编程调幅和调相飞秒激光脉冲。
作者：
Thomas Witte;Dirk Zeidler;D. Proch;K. Kompa;M. Motzkus
提出了一种利用差频混频产生3 ~ 10mum中红外波段可编程调相调幅飞秒激光脉冲的方案。采用液晶掩模对光参量放大器输出的80fs信号进行整形，并将其混合在具有暂时拉伸空闲脉冲的AgGaS(2)晶体中。在不改变机械对准的情况下，我们产生可编程的调幅和啁啾脉冲，λ =3mum，能量高达1muJ。此外，该方案允许产生可控脉冲序列。计算结果与理论模拟结果吻合较好。
We present a scheme to produce programmable phase- and amplitude-modulated femtosecond laser pulses in the mid-infrared regime of 3-10mum by difference frequency mixing. The 80-fs signal output of an optical parametric amplifier is shaped with a liquid-crystal mask and mixed in an AgGaS(2) crystal with a temporally stretched idler pulse. Without changing the mechanical alignment, we produce programmable amplitude modulations and chirped pulses at lambda=3mum with energy as high has thas 1muJ . This scheme, further, allows the generation of controllable pulse sequences. The results are in good agreement with theoretical simulations.