Low-threshold operation of a 355-nm pumped nanosecond β-BaB2O4 optical parametric oscillator

  • Bapna R
  • Rao C
  • Dasgupta K
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Abstract

We report the low-threshold operation of a nanosecond β-BaB2O4 optical parametric oscillator (OPO) pumped by the third harmonic of a Q-switched Nd:YAG laser. Using cylindrical focusing of the pump beam, a threshold pulse energy of ∼0.5 mJ is obtained at the signal wavelength of 560 nm, which is about sixteen times lower than that of a spherical focusing configuration. The importance of diffraction loss in the design of tightly focused OPOs is discussed in terms of a simple extension of the conventional OPO model. © 2007 Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • Cylindrical focusing
  • Optical parametric oscillators
  • Threshold energy

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Authors

  • R. C. Bapna

  • C. S. Rao

  • K. Dasgupta

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