We have developed a compact dispersion-free TG (transient-grating) FROG (frequency-resolved optical gating) by utilizing a mask that separates the input beam into three distinct beams focused into fused silica to create the FROG signal. Two of the beams are reflected off the same set of mirrors to ensure identical optical paths, eliminating the difficulty in establishing zero time delay between thc beams. In addition, the use of only reflective optics avoids material dispersion in the FROG except for the mixing crystal. This TG FROG is capable of operating with an intensity of I x 10~(11) W/cm~(2) and has resolutions less than 0.5 and 1.3 fs for 25- and 1O-fs input pulses, respectively.
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机译：通过利用将输入光束分成聚焦在熔融石英中的三个不同光束以产生FROG信号的掩模，我们已经开发出了紧凑的无色散TG（瞬态光栅）FROG（频率分辨光学选通）。其中两个光束从同一组反射镜反射，以确保相同的光路，从而消除了在两个光束之间建立零时间延迟的困难。另外，仅使用反射光学器件可避免混合晶体以外的材料散布在FROG中。该TG FROG能够以1 x 10〜（11）W / cm〜（2）的强度工作，并且对于25-和10-fs的输入脉冲分别具有小于0.5和1.3 fs的分辨率。
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