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High efficiency infrared generation by difference-frequency mixing using tangential phase matching
M.J.T.Milton, T.J.McIlveen, D.C.Hanna*, P.J.Woods
Division of Quantum Metrology, National Physical laboratory, Teddington, Middlesex, TW11 0LW, UK
* Optoelectronics Research Centre, University of Southampton, UK
Measurements have been made of the energy generated in the wavelength region 3.3 to 4.0 μm, by difference-frequency mixing between a tunable dye laser and a Nd:YAG laser in lithium niobate. The highest mixing efficiencies have been observed with the beams aligned in a non-collinear geometry. It is demonstrated that this non-collinear geometry corresponds to the tangential phase-matching condition which increases the acceptance angle of a second-order nonlinear interaction over that achieved in a non-critically phase-matched geometry.
Optics Communications (1992) Vol.87 pp.273-277
Copyright University of Southampton 2006