Discrimination of thermal, molecular orientation, and pure electronic refractive nonlinearities using the polarization-resolved Z-scan technique

被引：5
|
作者：
Moyses, R. M. [1 ]
Barbano, E. C. [2 ]
Misoguti, L. [1 ]
机构：
[1] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13566590 Sao Carlos, SP, Brazil
[2] Univ Fed Parana, Dept Fis, BR-81531980 Curitiba, PR, Brazil
来源：
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS | 2023年 / 40卷 / 04期
关键词：
OPTICAL NONLINEARITIES; 2-PHOTON ABSORPTION; DEPENDENCE;
D O I：
10.1364/JOSAB.482486
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We have investigated how the polarization-resolved Z -scan technique is able to distinguish and discriminate three types of nonlinear effects-thermal, orientational, and ultrafast electronic nonlinearities-when acting simul-taneously. Here employing a high-repetition-rate ultrafast laser, we excite these three nonlinearities in pure and contaminated CS2 solvent. Using 200 fs laser pulses, we could detect and measure the contribution of pure elec-tronic, orientational, and, more importantly, identify the growth of cumulative thermal effect as the laser repetition rate increases. Also, we have verified that the source of the thermal effect is mainly due to two-photon (one-photon) absorption for pure (contaminated) CS2.(c) 2023 Optica Publishing Group
引用
收藏
页码：C60 / C66
页数：7
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