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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 16,
  • Issue 12,
  • pp. 121901-
  • (2018)

Analysis and evaluation of idler absorption for quasi-parametric chirped-pulse amplification

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Abstract

Quasi-parametric chirped-pulse amplification (QPCPA) can improve the signal amplification efficiency and stability by inhibiting the back-conversion, in which the idler absorption plays a critical role. This Letter theoretically studies the impacts of idler absorption on the QPCPA performance in both the small-signal and saturation regimes. We demonstrate that there exists an optimal idler absorption that enables the achievement of maximum pump depletion within a minimum crystal length. To overcome the reduction in small-signal gain induced by idler absorption, the configuration of gradient idler absorption is proposed and demonstrated as a superior alternative to constant idler absorption. The results provide guidelines to the design of state-of-the-art QPCPA lasers.

© 2018 Chinese Laser Press

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