Lasers, Fiber Optics, and Communications

Polarization beam combination technique for gain saturation effect compensation in high-energy systems

[+] Author Affiliations
Junchi Chen

Tongji University, School of Physics Science and Engineering, No. 1239 Siping Road, Shanghai 200092, China

Shanghai Institute of Optics and Fine Mechanics, State Key Laboratory of High Field Laser Physics, Chinese Academy of Sciences, No. 390 Qinghe Road, Shanghai 201800, China

University of Chinese Academy of Science, No. 19 Yuquan Road, Beijing 100490, China

Yujie Peng, Yuxin Leng

Shanghai Institute of Optics and Fine Mechanics, State Key Laboratory of High Field Laser Physics, Chinese Academy of Sciences, No. 390 Qinghe Road, Shanghai 201800, China

Hongpeng Su

Shanghai Institute of Optics and Fine Mechanics, State Key Laboratory of High Field Laser Physics, Chinese Academy of Sciences, No. 390 Qinghe Road, Shanghai 201800, China

University of Chinese Academy of Science, No. 19 Yuquan Road, Beijing 100490, China

Opt. Eng. 55(6), 066111 (Jun 16, 2016). doi:10.1117/1.OE.55.6.066111
History: Received March 2, 2016; Accepted May 26, 2016
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Abstract.  To compensate for the gain saturation effect in the high-energy laser amplifier, a modified polarization beam combination (PBC) method is introduced to reshape temporal waveform of the injected laser pulse to obtain a controlled high-energy laser pulse shape after amplification. One linearly polarized beam is divided into two orthogonal polarized beams, which spatially recombine together collinearly after propagating different optical paths with relative time delay in PBC structure. The obtained beam with polarization direction being rotated by the following half wave plate is divided and combined again to reform a new beam in another modified polarization beam structure. The reformed beam is injected into three cascaded laser amplifiers. The amplified pulse shape can be controlled by the incident pulse shape and amplifier gain, which is agreeable to the simulation by the Frank–Nodvik equations. Based on the simple method, the various temporal waveform of output pulse with tunable 7 to 20 ns pulse duration can be obtained without interferometric fringes.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Junchi Chen ; Yujie Peng ; Hongpeng Su and Yuxin Leng
"Polarization beam combination technique for gain saturation effect compensation in high-energy systems", Opt. Eng. 55(6), 066111 (Jun 16, 2016). ; http://dx.doi.org/10.1117/1.OE.55.6.066111


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