Polarization smoothing (PS) is highly desired for inertial confinement fusion, high-power laser facilities. A self-PS technique based on beam array and type third-harmonic generation (THG) system is proposed in this paper. This scheme takes advantage of a type THG system, which induces a 35° angle between the polarization states of output third-harmonic laser and input fundamental laser. It rotates two THG systems in a beam array by 180° to obtain a 70° polarization angle between two sets of output lasers. Simulation results show that the intensity contrast of the overlapped focal spot can be reduced at without inserting any additional optics. This approaches the maximum value of various PS techniques (i.e., ).
© 2013 Optical Society of America
(140.3300) Lasers and laser optics : Laser beam shaping
(260.5430) Physical optics : Polarization
Original Manuscript: March 15, 2013
Manuscript Accepted: April 8, 2013
Published: May 10, 2013
Li Fuquan, Wang Fang, Han Wei, Feng Bin, and Zhou Lidan, "Self-polarization smoothing technique based on 2×2 beam array and type II+II third-harmonic generation system," Appl. Opt. 52, 3428-3432 (2013)