The sphere method is used for the direct measurement of sum- and difference-frequency generation phase matched in the principal planes of KTiOAsO<sub>4</sub>, RbTiOAsO<sub>4</sub>, and CsTiOAsO<sub>4</sub>, including the tuning curves of 1.064-µm-pumped OPO's emitting between 3 and 5 µm. The nonlinear least-squares fitting of our experimental data leads to refined dispersion equations of the principal refractive indices; the resulting dual-oscillator form equations are valid over the complete transparency range of the three studied materials.
© 2000 Optical Society of America
(160.1190) Materials : Anisotropic optical materials
(160.4330) Materials : Nonlinear optical materials
(160.4760) Materials : Optical properties
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4400) Nonlinear optics : Nonlinear optics, materials
Jean-Philippe Fève, Benoìt Boulanger, Olivier Pacaud, Isabelle Rousseau, Bertrand Ménaert, Gérard Marnier, Philippe Villeval, Christophe Bonnin, G. M. Loiacono, and D. N. Loiacono, "Phase-matching measurements and Sellmeier equations over the complete transparency range of KTiOAsO4, RbTiOAsO4, and CsTiOAsO4," J. Opt. Soc. Am. B 17, 775-780 (2000)