飞秒激光诱导0.3～2.0μm气溶胶的生成  

Femtosecond Laser-Induced 0.3-2.0 μm Aerosol Formation

作　　者：胡兴凯 鞠晶晶[1] 李儒新[1] 孙海轶[1] 刘永宏[1] 王成[1] 邓兆泽[3] 冉靓[3] 刘建胜[1,4,5] 陈瑞良 徐至展[1] Hu Xingkai;Ju Jingjing;Li Ruxin;Sun Haiyi;Liu Yonghong;Wang Cheng;Deng Zhaoze;Ran Liang;Liu Jiansheng;Chin See Leang;Xu Zhizhan(State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;Inertial Fusion Sciences and Applications (IFSA) Collaborative Innovation Center,Shanghai Jiao Tong University,Shanghai 200240,China;Department of Physics,Shanghai Normal University,Shanghai 200234,China;Key Laboratory for Middle Atmosphere and Global Environment Observation (LAGEO),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;Center for Optics,Photonics and Laser (COPL),Laval University,Quebec City,Quebec G1V0A6,Canada)

机构地区：[1]中国科学院上海光学精密机械研究所强场激光物理国家重点实验室,上海201800 [2]中国科学院大学,北京100049 [3]中国科学院大气物理研究所中层大气和全球环境探测重点开放实验室,北京100029 [4]上海交通大学聚变科学与应用协同创新中心,上海200240 [5]上海师范大学物理系,上海200234 [6]拉瓦尔大学光学光子学和激光研究中心

出　　处：《中国激光》2019年第3期226-235,共10页Chinese Journal of Lasers

基　　金：国家重点基础研究发展计划(2011CB808100);国家自然科学基金(11425418;61475167);中国科学院战略性科技先导专项(B类)(XDB160104)

摘　　要：在室温条件下的小型云室中,研究了不同参数对飞秒激光诱导较大尺寸气溶胶生成的影响。实验结果表明,在亚饱和条件下,随着环境相对湿度的提高,不同尺寸气溶胶的数密度增大,尺寸分布以0.3～0.5μm为主;当环境相对湿度达到近饱和条件时,较大尺寸(直径D≥0.7μm)气溶胶的数密度显著增大,1.0～2.0μm气溶胶与0.3～0.5μm气溶胶的数密度可相比拟。此时,通过延长激光照射时间或者缩紧激光聚焦条件,不同尺寸气溶胶的数密度可同等程度地增大,尺寸分布规律基本不变。理论分析结果表明,环境相对湿度条件是制约飞秒激光诱导较大尺寸气溶胶生成的关键因素。Under room temperature,the influences of different parameters on the formation of femtosecond laser-induced aerosols with relatively large size in a small cloud chamber are studied.The experimental results show that,under sub-saturated condition,the aerosol number density increases with the increase of relative humidity,and 0.3-0.5μm aerosols are dominated.However,when the environmental relative humidity is near to be saturated,the number density of relative large-size aerosols(with their diameter D≥0.7μm)is enhanced mostly,and at the end,the number density of 1.0-2.0μm aerosols is comparable with that of 0.3-0.5μm aerosols.When the laser irradiation duration and tightened focusing condition are prolonged under this near saturated condition,the number density of different size aerosols increases simultaneously at the same degree,and ultimately the corresponding size distribution does not change too much.Theoretical analysis results show that environmental relative humidity plays a key role for femtosecond laser-induced relative large-size aerosol formation.

关 键 词：超快光学 非线性光学 飞秒光丝 气溶胶 光化学反应 

分 类 号：TN249[电子电信—物理电子学]