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Proceedings Article

Laser-pumped cascaded optical parametric oscillators for watt level mid-IR generation

[+] Author Affiliations
David G. Lancaster

Defence Science and Technology Organisation (Australia)

Proc. SPIE 5620, Solid State Laser Technologies and Femtosecond Phenomena, 70 (December 23, 2004); doi:10.1117/12.579941
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From Conference Volume 5620

  • Solid State Laser Technologies and Femtosecond Phenomena
  • Jonathan A. C. Terry; W. Andrew Clarkson
  • London, United Kingdom | October 25, 2004

abstract

This paper presents a new frequency conversion architecture based on a cascaded KTiPO4 (KTP) and ZnGeP2 (ZGP) optical parametric oscillator (OPO)/optical parametric amplifier (OPA) system. Up to 0.84 W of combined signal and idler output is achieved, which is tunable across the 3.8-4.8 μm spectral region. Incident Nd:YAG pump power is 6.3 W. To achieve efficient low pulse energy conversion, the KTP OPO used a line focus and multiple crystal walk-off compensation. The novel ZGP OPO/OPA configuration efficiently utilizes both of the orthogonally polarized KTP OPO signal and idler beams. The OPA is pumped by combining the 3.8-4.8 μm output from the ZGP OPO with the unused 2.13 μm beam, which is then focused into two ZGP crystals configured as a walk off compensated OPA. Measured beam quality of the OPA signal and idler output has an M2<2, and the residual 2.13μm OPA pump light is also collinear with the mid-IR light.

© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

David G. Lancaster
"Laser-pumped cascaded optical parametric oscillators for watt level mid-IR generation", Proc. SPIE 5620, Solid State Laser Technologies and Femtosecond Phenomena, 70 (December 23, 2004); doi:10.1117/12.579941; http://dx.doi.org/10.1117/12.579941


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