High Harmonic Generation and Vacuum Ultraviolet Spectrum Generated from Two-Color Laser Induced Ar Plasma
Wei-Jan Chen1*, Chieh-Chuan Chen1, Chan-Shan Yang1, Chao-Kuei Lee2, Ci-Ling Pan1
1Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
2Department of Photonics, National Sun Yat-Sen University, Kaohsiung, Taiwan
* presenting author:Wei-Jan Chen, email:wjchen@phys.nthu.edu.tw
High harmonic generation is not only a major source of attosecond pulse, but also an important coherent VUV light source. These harmonics generation from laser induced Ar plasma were initiated by a Q-switched Nd:YAG laser fundamental (1064 nm) and second harmonic generation (532 nm) at the focused intensity of around 1013 W/cm2. Besides the harmonics generation, the characteristics of a continuous VUV spectrum generated from two-color laser induced Ar plasma are also investigated. We study the enhancement of harmonics generation and the continuous VUV spectrum by the waveform control of this two-color laser field. These results are useful for the understanding of harmonics generation and VUV spectrum from laser radiation in plasmas.

Keywords: harmonics generation, vacuum ultraviolet, waveform control