[OPTICAL REVIEW Vol. 2, No. 4 (1995) 280-284]

Absolute Measurement of Second-Order Nonlinear Optical Coefficient of LiNbO3 by Parametric Processes

Ayako KITAMOTO, Takashi KONDO, Ichiro SHOJI and Ryoichi ITO

Department of Applied Physics, Faculty of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113 Japan

(Received May 10, 1995; Accepted June 20, 1995)

We have redetermined the absolute values of the nonlinear optical coefficient, d31, of LiNbO3 by parametric fluorescence and, for the first time, by difference frequency generation measurements to resolve the considerable discrepancy that existed between the values determined by second-harmonic generation (SHG) and parametric fluorescence. We obtain d31=4.8±0.5 and 4.3±0.5 pm/V at the pump wavelengths of 488 and 532 nm, respectively, in reasonable agreement with the SHG data. It appears that the previous parametric fluorescence value, d31=5.8 pm/V, was overestimated.

Key words : absolute measurement, second-order nonlinear optical coefficient, parametric fluorescence, difference frequency generation