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Proceedings Paper

Laser-pumped cascaded optical parametric oscillators for watt level mid-IR generation
Author(s): David G. Lancaster
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Paper 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.

Paper Details

Date Published: 23 December 2004
PDF: 7 pages
Proc. SPIE 5620, Solid State Laser Technologies and Femtosecond Phenomena, (23 December 2004); doi: 10.1117/12.579941
Show Author Affiliations
David G. Lancaster, Defence Science and Technology Organisation (Australia)


Published in SPIE Proceedings Vol. 5620:
Solid State Laser Technologies and Femtosecond Phenomena
Jonathan A. C. Terry; W. Andrew Clarkson, Editor(s)

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