SHG AND INTERNAL CONICAL REFRACTION EXPERIMENTS IN CSTIOASO4 - COMPARISON WITH KTIOPO4 AND KTIOASO4 FOR 1.32-MU-M TYPE-II SHG

The internal conical refraction angles between 0.532-1.32 mu m, the ph ase-matching directions of 1.064 mu m Type I second harmonic generatio n (SHG) and of 1.32-mu m Type II SHG are measured in a sphere of CsTiO AsO4 (CTA). The relative sign and absolute magnitude of two independen t quadratic nonlinear coefficients are determined by 1.32-mu m phase-m atched Type II SHG conversion efficiency measurements in a sphere and strips: d(15) = 1.09 +/- 0.09 pm/V and d(24) = 1.7 +/- 0.6 pm/V at 0.6 6 mu m. All the results are compared with previous work. The compariso n of CTA with KTiOPO4 and KTiOAsO4 is made in order to evaluate the cr ystal which provides the highest conversion efficiency for 1.32-mu m T ype II SHG depending on the crystal length and on the beam waist radiu s.