Abstract

We report the experiment of a laser beam amplified by another beam coming from the same laser after both beams crossed in 0.1-wt. % Ce-doped strontium barium niobate (Ba_xSr_1−xNb₂O₆ or SBN x = 0.48) crystal. The thirteenfold amplification is obtained (without an external electric field) and we predict that this factor of 13 is not the upper limit. Through this experiment the density of mobile charges Pd in Ce-SBN crystal was calculated to be +4.5 × 10¹⁶ cm⁻³, and the photorefractive index n₁ is 1.83 × 10⁻⁴, and the maximum intensity of electric field E, which exists between the finger pattern of mobile charges in crystal Ce-SBN, is 7.8 × 10⁴ V/M.

© 1986 Optical Society of America