Collection Of theses on high power laser and plasma physics, 2006, 4 (1): 16, Published Online: Jun. 4, 2007
Influences of Polarization Angle θpon Pulse Shape of High Power Laser Frequency Tripling
非线性光学 三倍频波形 偏振分配角 功率平衡 nonlinear optics frequency tripling pulse shape polarization angle power balance
Abstract
A theoretical calculation is presented for third-harmonic generation in KDP crystal for type Ⅱ- type Ⅱ polarization-mismatch scheme by using the four-stepped Runge-Kutta method. For the “Shenguang Ⅱ” frequency tripling system, the doubling angle θd and the tripling angle θt are located at optimized situation, by changing detuned values of the polarization angle θp, the corresponding changes of pulse shape properties was gotten. The results show that when the polarization angle θp is located at optimized situation, the full width at half maximum (FWHM) τ is minimum and the pulse shape rises fastest. Increasing the θp from optimized situation causes the τ widens faster and the pulse shape rises slower than decreasing the θp from optimized situation. In the experiment, by changing the polarization angle θp, the pulse shapes consistency of the “Shenguang Ⅱ” eight frequency tripling beams has been accomplished. This work offers a method for adjusting crystals and actualizing power balance.
Shulin Zhao, Baoqiang Zhu, Tingyu Zhan, Xijie Cai, Renhong Liu, Lin Yang, Zhixiang Zhang, Jijun Bi. Influences of Polarization Angle θpon Pulse Shape of High Power Laser Frequency Tripling[J]. Collection Of theses on high power laser and plasma physics, 2006, 4(1): 16.