Acta Optica Sinica, Volume. 34, Issue 2, 214005(2014)
Research on Nonlinear Degeneration and Compensation of Beam Quality in High Power Laser System
In order to consider factors such as system aberrations into account in the nonlinear propagation simulation of high power laser, a ray-tracing method for nonlinear media is presented, and hybrid modeling for linear and nonlinear media is realized through programming. Three-lens focusing system with KDP crystal as the nonlinear media is taken as an example, and simulation analysis of the influence of nonlinear effect on beam quality is conducted with different laser power densities. The simulation results show that when the laser power density reaches 1.62×1010 W/cm2, the laser beam quality is degenerated evidently by nonlinear effect. Based on the simulation results, an optimization method, which takes the optical component intervals as compensation without changing the position of focal plane, is presented. The optimization results show that the focal spot size decreases by 2.8 μm, and the encircled energy under standardized dimension increases by 16.2%, thus the beam quality at focal plane is significantly improved.
Get Citation
Copy Citation Text
Zhang Luwei, Li Xiaotong, Cen Zhaofeng, Ruan Wangchao, Luo Hongmei. Research on Nonlinear Degeneration and Compensation of Beam Quality in High Power Laser System[J]. Acta Optica Sinica, 2014, 34(2): 214005
Category: Lasers and Laser Optics
Received: Jul. 31, 2013
Accepted: --
Published Online: Jan. 23, 2014
The Author Email: Luwei Zhang (xiaoweilucia@gmail.com)