R Ryf, G Montemezzani, P Günter - J. Opt. A: Pure Appl. Opt, 2001 - scholar.archive.org
We show that cerium doped KNbO3 crystals exhibit high photorefractive sensitivities of S1=
25× 10− 11 m3 J− 1 and S2= 78× 10− 9 m2 J− 1 at 488 nm. The grating build-up time at a …