Applied Physics B

, Volume 85, Issue 1, pp 73–77

Ultrabroad gain in an optical parametric generator with periodically poled KTiOPO4

  • M. Tiihonen
  • V. Pasiskevicius
  • A. Fragemann
  • C. Canalias
  • F. Laurell
Article

Abstract

An optical parametric gain bandwidth of 115 THz at full-width half maximum is generated from a picosecond Ti:sapphire pumped degenerate optical parametric generator. This ultrabroad bandwidth could be obtained by first identifying the wavelength where the nonlinear optical material has zero group-velocity dispersion (GVD). By pumping at half this wavelength the degenerate signal–idler pairs can accommodate ultrabroad bandwidths. The explanation for this is that the group velocities of the signal and the idlers are approximately matched and the GVD is small. However, in order to thoroughly investigate the degeneracy region around 1700 nm we fabricated several periodically poled KTiOPO4 (PPKTP) crystals with different periods, and also one periodically poled RbTiOPO4 (PPRTP). Both collinear and noncollinear configurations were employed for broadband parametric generation in this region. It was found that the optimum pump wavelength is in the region between 800 nm to 850 nm for PPKTP, and we could also conclude that a similar performance was found for PPRTP. This work will allow the design of optical parametric devices for generating few-cycle pulses in the spectral region between 1.1 μm and 3.8 μm.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • M. Tiihonen
    • 1
  • V. Pasiskevicius
    • 1
  • A. Fragemann
    • 1
  • C. Canalias
    • 1
  • F. Laurell
    • 1
  1. 1.Royal Institute of TechnologyDepartment of PhysicsStockholmSweden

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