Research of beam smoothing technology on the technical integration line

Rui Zhang; Jingqin Su; Ping Li; Ying Zhang; Jianjun Wang; Jun Dong; Dong Yang; Feng Jing; Lixin Xu; Hai Ming

doi:10.1117/12.2010535

16 May 2013 Research of beam smoothing technology on the technical integration line

Rui Zhang, Jingqin Su, Ping Li, Ying Zhang, Jianjun Wang, Jun Dong, Dong Yang, Feng Jing, Lixin Xu, Hai Ming

Proceedings Volume 8796, 2nd International Symposium on Laser Interaction with Matter (LIMIS 2012); 87961Q (2013) https://doi.org/10.1117/12.2010535
Event: 2nd International Symposium on Laser Interaction with Matter (LIMIS 2012), 2012, Xi'an, Shaanxi, China

Abstract

This paper is focused on the research of SSD and CPP carried out on TIL. A bulk phase modulator with 9.2-GHz modulation frequency is adopted in SSD. The output spectrum of the phase modulator is stable and the residual amplitude modulation is small. FM-to-AM effect caused by free-space propagation after using smoothing by spectral dispersion is theoretically and experimentally studied. Results indicate inserting a dispersion grating in places with larger beam aperture alleviates the FM-to-AM effect, suggesting minimizing free-space propagation and adopting image relay. Experiments indicate when the number of color cycles (N_c) adopts 1, imposing of SSD with 4.26 times diffraction limit (TDL) did not lead to pinhole closure in the spatial filters of the preamplifier with 20 TDL and main amplifier with 26 TDL. Experimental results also indicate SSD didn’t influence the load capacity of the laser facility. The contrast of the 440-μm diameter focal spot with 95% energy included using SSD and CPP drops to 0.47, comparing to 1.71 not using SSD and CPP. When the pulse width of the third harmonic wave is 1 ns and the energy is 1115 J, no damage is found in CPP and other final optics. The experiments solves some key technical problems using SSD and CPP on high-power laser facilities, and provides a flexible platform for the laser-plasma interaction experiments.

Citation Download Citation

Rui Zhang, Jingqin Su, Ping Li, Ying Zhang, Jianjun Wang, Jun Dong, Dong Yang, Feng Jing, Lixin Xu, and Hai Ming "Research of beam smoothing technology on the technical integration line", Proc. SPIE 8796, 2nd International Symposium on Laser Interaction with Matter (LIMIS 2012), 87961Q (16 May 2013); https://doi.org/10.1117/12.2010535

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