Electric-field-profile measurement along a probing laser path based on electric-field-induced second-harmonic generation
Electric-field-profile measurement along a probing laser path based on electric-field-induced second-harmonic generation
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基于电场感应二次谐波产生的沿探测激光路径的电场分布测量
DOI：
10.1103/physreva.104.053511
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发表时间：
2021
影响因子：
2.9
通讯作者：
Akiko Kumada and Yuji Oishi
中科院分区：
文献类型：
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作者：
Shin Nakamura;Mashiro Sato;Takashi Fujii;Akiko Kumada and Yuji Oishi
基于气体分子电场感应二次谐波产生（E-FISHG）的电场测量是一种很有前途的方法，可以实现气体中的无创场测量。虽然探测激光束通过透镜聚焦在目标区域上，但E-FISHG方法检测到的信号会受到探测激光路径上沿着电场的影响，影响路径跨越聚焦光斑前后瑞利长度的数十倍。E-FISHG信号经常在均匀电场下校准。然而，如果不考虑测量和校准中的电场分布之间的差异，则这可能产生显著不正确的校准值。本文提出了一种通过改变聚焦光斑的位置来测量一系列E-FISH信号，进而标定并恢复沿探测光路沿着电场分布的方法。从测量的E-FISH信号序列中成功地恢复了沿着探测光路的电场分布，并通过实验进行了验证。
Electric field measurement based on electric-field-induced second-harmonic generation (E-FISHG) of gas molecules is a promising method that enables noninvasive field measurement in gases. Although the probing laser beam is focused on the target area by a lens, the signal detected by the E-FISHG method is affected by the electric field along the probing laser path. The influencing path spans many tens of times the Rayleigh length of the front and rear of the focused spot. The E-FISHG signal has been frequently calibrated under uniform electric fields. However, this can yield a significantly incorrect calibrated value if the difference between the electric-field profiles in the measurement and calibration is not considered. In this paper, we propose a method to calibrate and furthermore restore the electric-field profile along a probing optical path by measuring a series of E-FISHG signals by changing the focusing spot position. The electric-field profile along the probing laser path is successfully restored from the measured E-FISHG signal sequence, which is verified by an experiment.