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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 16, Iss. 8 — Aug. 1, 1999
  • pp: 1300–1304

Phase-matching temperature shifts in blue generation by frequency doubling of femtosecond pulses in KNbO3

Sungkyu Yu and A. M. Weiner  »View Author Affiliations

JOSA B, Vol. 16, Issue 8, pp. 1300-1304 (1999)

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We have demonstrated temperature rises that result from nonlinear absorption in single-pass frequency-doubling experiments using femtosecond pulses and a 3-mm-thick KNbO3 crystal. These temperature changes shift the phase-matching curve and must be accounted for to optimize the conversion efficiency. We obtained a maximum second-harmonic generation (SHG) efficiency of 66% at an input power of 107 mW and a slope efficiency of ∼1.5%/mW at low input powers. We have investigated, for the first time to our knowledge, the focusing dependence of the phase-matching temperature. We have also found that the temperature-dependent SHG efficiency in femtosecond SHG experiments is significantly different from that obtained for frequency doubling of continuous-wave light.

© 1999 Optical Society of America

OCIS Codes
(190.0190) Nonlinear optics : Nonlinear optics
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4160) Nonlinear optics : Multiharmonic generation
(320.0320) Ultrafast optics : Ultrafast optics
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.7110) Ultrafast optics : Ultrafast nonlinear optics

Sungkyu Yu and A. M. Weiner, "Phase-matching temperature shifts in blue generation by frequency doubling of femtosecond pulses in KNbO3," J. Opt. Soc. Am. B 16, 1300-1304 (1999)

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