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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 13 — Jul. 1, 2013
  • pp: 15580–15594

Surface-reflection-initiated pulse-contrast degradation in an optical parametric chirped-pulse amplifier

Jing Wang, Peng Yuan, Jingui Ma, Yongzhi Wang, Guoqiang Xie, and Liejia Qian  »View Author Affiliations

Optics Express, Vol. 21, Issue 13, pp. 15580-15594 (2013)

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We study a novel mechanism of pre-pulse generation in an optical parametric chirped-pulse amplification (OPCPA) system through an analytical approach together with numerical simulations. The acquired pre-pulses are initiated from the surface-reflection-induced modulation of the seed spectrum and occur as a consequence of high-order distortion of such modulated spectrum due to the instantaneous gain saturation effect. We demonstrate that the intensities of pre-pulses increase quadratically with the initial temporal modulation-depth of the stretched signal pulse as well as the conversion efficiency prior to substantial pump-depletion. Explicit formulas for estimating the contrast limit due to surface reflections are present. We also discuss the impact of group-velocity mismatch on the pre-pulse generation. The results of this work may deepen our cognition on the complexity of the pulse-contrast problem in OPCPA systems.

© 2013 OSA

OCIS Codes
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
(320.7090) Ultrafast optics : Ultrafast lasers

ToC Category:
Nonlinear Optics

Original Manuscript: April 10, 2013
Revised Manuscript: June 4, 2013
Manuscript Accepted: June 4, 2013
Published: June 21, 2013

Jing Wang, Peng Yuan, Jingui Ma, Yongzhi Wang, Guoqiang Xie, and Liejia Qian, "Surface-reflection-initiated pulse-contrast degradation in an optical parametric chirped-pulse amplifier," Opt. Express 21, 15580-15594 (2013)

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