Thermal Lensing Effects Induced in C₂H₄Cl₂ and C₂H₄Br₂ by 18 Fs 820 Nm Femtosecond Laser Pulses
Yu-Ting Kuo1*, Yi-Ci Li1, Po-Yuan Huang1, Cheng-I Lee2, Tai-Huei Wei1
1Department of Physics, National Chung Cheng University, Chia-Yi, Taiwan
2Department of Life Science, National Chung Cheng University, Chia-Yi, Taiwan
* presenting author:YuTing Kuo, email:mitchkyt@gmail.com
1,2-dichloroethane and 1,2-dibromoethane show linear absorption (LA) at 820 nm in their infrared spectra. In addition, they exhibit stimulated light scattering (SLS) in the study of their optically-heterodyne detected optical Kerr effect with 820 nm 18 fs laser pulses. In this study, we further compare the contributions of LA and SLS to the the heating and thermal lensing effects induced in both samples using the Z-scan technique with 82 MHz 820 nm 18 fs laser pulses. By measuring the peak to valley separation and by comparing the ratios of the signals taken at various powers to the corresponding power ratios, we verify that LA dominates the heating and thermal lensing effects.


Keywords: Z-scan, thermal lensing effect, stimulated light scattering, linear absorption