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Proceedings Paper

Performance of smoothing by spectral dispersion combined with distribute phase plate on SG-II
Author(s): Youen Jiang; Rong Wu; Shenlei Zhou; Jinghui Li; Xuechun Li; Zunqi Lin
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Paper Abstract

Experimental performance of one-dimensional (1D) smoothing by spectral dispersion (SSD) combined with distributed phase plate (DPP) on the ninth beam of SG-II is presented. Without the application of SSD, normalized focal-spot non-uniformity of an 85% energy concentration is about 60%. Then, spectral bandwidth of the 3-ns, 1053-nm laser pulse is broadened to 0.3 nm (as 270GHz in 3ω) by a 3-GHz modulator and a 10-GHz modulator integrated in the front-end system. Spectral dispersion of 236 μrad/Å is achieved by a Littrow-configuration, 1480-l/mm grating placed between the Φ40mm faraday isolator and the third Φ40mm rod-amplifier. By using such SSD, normalized non-uniformity with the same energy concentration is decreased to 16%. A scheme of spatial power spectral density (PSD) in different directions is adopted to analyze the intensity distribution of the far-field irradiation. Based on the spatial PSD analysis, theoretical predictions of spectral peak caused by SSD’s color cycles is in excellent agreement with the experimental result. With double-frequency modulation, the amplitude of the spectral peak is reduced by ~10dB. The temporal waveform of the 1ω laser is measured. Waveform distortion criterion defining the frequency modulation to amplitude modulation conversion (FM-to-AM) is about 6% with 1ω laser energy of ~1.8kJ.

Paper Details

Date Published: 17 September 2013
PDF: 7 pages
Proc. SPIE 8904, International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications, 890403 (17 September 2013); doi: 10.1117/12.2030706
Show Author Affiliations
Youen Jiang, Shanghai Institute of Optics and Fine Mechanics (China)
Rong Wu, Shanghai Institute of Optics and Fine Mechanics (China)
Shenlei Zhou, Shanghai Institute of Optics and Fine Mechanics (China)
Jinghui Li, Shanghai Institute of Optics and Fine Mechanics (China)
Xuechun Li, Shanghai Institute of Optics and Fine Mechanics (China)
Zunqi Lin, Shanghai Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 8904:
International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications
Andreas Tünnermann; Zejin Liu; Pu Wang; Chun Tang, Editor(s)

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