Generation of high contrast and high spatial quality idler from a low-gain optical parametric amplifier

A. B. Sharba*, G. Nersisyan, M. Zepf, N. H. Stuart, R. A. Smith, M. Borghesi, G. Sarri

*Corresponding author for this work

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The temporal contrast of a regeneratively amplified, sub-picosecond pulse is enhanced by employing a low-gain optical parametric amplification stage self-pumped by the second harmonic of the pulse. Through careful characterization of the two related nonlinear processes and optimization of the non-collinear geometry, a robust high-contrast idler pulse has been generated, with excellent spatial quality in both the near and far field. The overall energy conversion efficiency exceeds 14%, with 33% intensity conversion efficiency. The temporal cleaning is implemented without any bandwidth losses or spectral shift and produces approximately 20% temporal shortening. These experimental findings are in excellent agreement with numerical calculations.

Original languageEnglish
Pages (from-to)9341-9346
Number of pages6
JournalApplied Optics
Issue number33
Early online date18 Oct 2016
Publication statusPublished - 20 Nov 2016


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