Phase-matching measurements and Sellmeier equations over the complete transparency range of KTiOAsO4, RbTiOAsO4, and CsTiOAsO4

The sphere method is used for the direct measurement of sum- and difference -frequency generation phase matched in the principal planes of KTiOAsO4, Rb TiOAsO4, and CsTiOAsO4, including the tuning curves of 1.064-mu m-pumped OP O's emitting between 3 and 5 mu m. The nonlinear least-squares fitting of o ur experimental data leads to refined dispersion equations of the principal refractive indices; the resulting dual-oscillator farm equations are valid over the complete transparency range of the three studied materials. (C) 2 000 Optical Society of America [S0740-3224(00)01505-8]. OCIS codes: 190.262 0,.190.4400, 160.4330, 160.4760, 160.1190.