Effects of initial humidity and temperature on laser-filamentation-induced condensation and snow formation

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 humi...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2013-03, Vol.110 (3), p.375-380
Main Authors: Ju, Jingjing, Liu, Jiansheng, Wang, Cheng, Sun, Haiyi, Wang, Wentao, Ge, Xiaochun, Li, Chuang, Chin, See Leang, Li, Ruxin, Xu, Zhizhan
Format: Article
Language:English
Subjects:
Cloud chambers
Condensing
Engineering
Femtosecond
Filaments
Humidity
Lasers
Optical Devices
Optics
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
Snow
Snowflakes
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Summary: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 ( (90 ± 11) % and to ice RH i  > (120 ± 15) %) were found being important to assist an efficient laser-filamentation-induced condensation and snow formation.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-012-5265-5