Effects of initial humidity and temperature on laser-filamentation-induced condensation and snow formation |
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| Authors: | Jingjing Ju Jiansheng Liu Cheng Wang Haiyi Sun Wentao Wang Xiaochun Ge Chuang Li See Leang Chin Ruxin Li Zhizhan Xu |
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| Institution: | 1. State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China
2. Center for Optics, Photonics and Laser, Laval University, Quebec City, QC, G1V 0A6, Canada
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| Abstract: | We investigated the effects of initial humidity and temperature on the formation of water condensation and various snowflake patterns by firing high-repetition filaments of femtosecond Ti-sapphire laser pulses at 9 mJ/50 fs per pulse into a cloud chamber. While adjusting initial temperature and humidity distributions near the filaments, snowflakes and ice particles with various shapes and sizes were observed on the bottom cold plate. In addition, significant differences were found in the weights of the laser-induced snow below the filament center. From those data, initial conditions of low temperature (<?15 °C) and high humidity (relative to water RHw > (90 ± 11) % and to ice RHi > (120 ± 15) %) were found being important to assist an efficient laser-filamentation-induced condensation and snow formation. |
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