Observation of two-times self-focusing of femtosecond laser beam in ZnO crystal by two-photon luminescence  

作　　者：Xiaorui Wang Honggang Ye Zhicheng Su Dapeng Yu Shijie Xu 

机构地区：[1]Department of Physics,and Shenzhen Institute of Research and Innovation (HKU-SIRI),The University of Hong Kong,Hong Kong,China [2]Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China [3]Department of Applied Physics,Xi'an Jiaotong University,Xi'an 710049,China

出　　处：《Science Bulletin》2018年第21期1392-1396,共5页科学通报（英文版）

基　　金：financially supported by Shenzhen Municipal Science and Technology Innovation Council (JCYJ20170818141709893);National Natural Science Foundation of China (11374247);Hong Kong RGC-GRF Grant (HKU 705812P)

摘　　要：By ‘‘seeing" the green two-photon luminescence, two separate focusing points are observed on the propagation axis of a converging femtosecond laser beam in a ZnO single crystal rod. It is found that the selffocusing effect makes a significant contribution to the formation of the first focusing point, while the second focusing point is caused by self-refocusing. The position of the first focusing point is in good agreement with the value predicted by a model developed by Chin and his co-workers. These experimental findings could be the unprecedented evidence for the self-focusing and refocusing effect of the femtosecond laser filament propagation in nonlinear media.By ‘‘seeing" the green two-photon luminescence, two separate focusing points are observed on the propagation axis of a converging femtosecond laser beam in a ZnO single crystal rod. It is found that the selffocusing effect makes a significant contribution to the formation of the first focusing point, while the second focusing point is caused by self-refocusing. The position of the first focusing point is in good agreement with the value predicted by a model developed by Chin and his co-workers. These experimental findings could be the unprecedented evidence for the self-focusing and refocusing effect of the femtosecond laser filament propagation in nonlinear media.

关 键 词：SELF-FOCUSING Self-refocusing ZNO rod TWO-PHOTON LUMINESCENCE 

分 类 号：N[自然科学总论]