Journal of the Optical Society of America B · 1996 · 27 citations · 3 references
Natural SciencesMaterials SciencePhysicsOptical MaterialsOpticsPhotonicsCrystal ChemistryInfrared Optical MaterialsLaser Host MaterialsNonlinear OpticsOptical Properties Of SolidsRefractive IndexBeam DivergenceNonlinear Frequency ConversionNonlinear Wave GenerationOptical Frequency ConversionOptical Parametric OscillationOptical Parametric OscillatorsPhase MatchingSellmeier Equation
Rubidium titanyl arsenate (RTA), a crystallographic isomorph of potassium titanyl phosphate, shows promise for nonlinear-frequency generation throughout the 1–5-µm spectral region. Difference-frequency generation in an RTA crystal produced tunable output in the 3.2–4.2-µm wavelength range. A single 1.064-µm Nd:YAG laser pumped both a LiNbO3 optical parametric oscillator used to generate a tunable signal beam and the RTA crystal used for difference-frequency generation. Conversion efficiencies were limited to 4% primarily by the large beam divergence of the signal beam. Phase-matching measurements were in excellent agreement with new IR-corrected RTA Sellmeier equations based on refractive-index measurements.
3