Photorefractive two-wave mixing was examined in the context of optical image amplification for diffusion-driven crystals at three wavelengths. Gain, beam fanning, and energy distribution at the image plane were studied in poled doped samples of KNbO₃, BaTiO₃, and SBN. Response were characterized at 514.5 nm, 632 nm, and 823 nm. To study the response at 823 nm, a mode-stabilized laser diode was used. To achieve stable optical image amplification in a continuous wave regime, low light levels were required for BaTiO₃ at 514.5 nm. KNbO₃ was a viable coupler at 514.5 nm at milliwatt power levels. Data indicates that SBN is a suitable coupler in the green only at extremely low power levels (microwatts). All three crystals exhibited gains in the near-infrared

Date Published: 1 June 1991
PDF: 13 pages
Proc. SPIE 1409, Nonlinear Optics II, (1 June 1991); doi: 10.1117/12.43562

Published in SPIE Proceedings Vol. 1409:
Nonlinear Optics II
Robert A. Fisher; John F. Reintjes, Editor(s)