O. Eknoyan et al., COMPARISON OF PHOTOREFRACTIVE DAMAGE EFFECTS IN LINBO3, LITAO3, AND BA1-XSRXTIYNB2-YO6 OPTICAL WAVE-GUIDES AT 488 NM WAVELENGTH, Applied physics letters, 71(21), 1997, pp. 3051-3053
Photorefractive-induced damage effects at 488 nm wavelength in LiNbO3,
LiTaO3, and Ba1-xSrxTiyNb2-yO6 (BSTN) optical waveguides are compared
for the extraordinary mode of polarization. The damage effects are st
rongest in LiNbO3 and weakest in BSTN. At an input power density of 30
00 W/cm(2), the output power from passive channel waveguide in LiNbO3
is more than 12 dB lower than in BSTN. Optically induced index changes
measured using a Fabry-Perot interferometric method show a nonlinear
behavior with increasing input intensity for all these materials. For
incident power densities greater than 200 W/cm(2) on the waveguide, th
e optically induced index-change damage increases at a rate of 2.8x10(
-3) cm(2)/mu W in LiNbO3, 4.9 x 10(-4) cm(2)/mu W in LiTaO3, and 3.1x1
0(-4) cm(2)/mu W in BSTN. (C) 1997 American Institute of Physics.