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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 12,
  • Issue 9,
  • pp. 091401-
  • (2014)

Narrowband optical parametric amplifier for efficient conversion of high-energy pulse with high beam quality

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Abstract

In a two-stage optical parametric amplifier based on KTiOAO4 crystals, we apply beam-overlapping technique to nanosecond signal pulse amplification, which results in high conversion efficiency and good beam quality. A signal pulse energy of 66 mJ at 1.572 µm wavelength is generated with 220 mJ of pump pulse input. A maxi­mum gain of 66 and a maximum pump depletion of as high as 44% are determined. The spectral linewidth of the amplified signal pulse is around 50 MHz, and the beam quality factor of M.2 is less than 2.3.

© 2014 Chinese Optics Letters

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