Buser R G, Rohde R S, Berger P J, Gebhardt F G, Smith D C
Appl Opt. 1975 Nov 1;14(11):2740-6. doi: 10.1364/AO.14.002740.
Energy transfer through absorbing media with pulses short compared to the acoustic transit time has been investigated experimentally and theoretically for collimated beams in a homogeneous wind field. Two experimental approaches were used: a low intensity cw CO(2) laser probe beam technique giving a continuous record of the lensing of the medium following the transmission of a coaxial high power TEA laser pulse and a direct determination of high power pulse train blooming using a thermofax covered drum. The experimental results support the predictions of a geometric optics perturbation solution as well as those of existing propagation codes. An interesting case, namely, enhancement resulting in a 20-30% increase of the original nonbloomed peak intensity is observed when the pulse separation time is approximately 1-2 times the wind flow time across the beam.
对于均匀风场中的准直光束，在声学渡越时间相比脉冲很短的情况下，通过吸收介质的能量传输已进行了实验和理论研究。采用了两种实验方法：一种是低强度连续波CO(2)激光探测光束技术，可在同轴高功率TEA激光脉冲传输后连续记录介质的透镜效应；另一种是使用热传真覆盖鼓直接测定高功率脉冲序列的展宽。实验结果支持几何光学微扰解的预测以及现有传播代码的预测。当脉冲间隔时间约为风流穿过光束时间的1 - 2倍时，观察到一个有趣的情况，即增强导致原始未展宽峰值强度增加20 - 30%。
