Enhanced photocurrent in photo-emf experiments in pure and doped absorbing photorefractive crystals

L Mosquera, J Frejlich - JOSA B, 2002 - opg.optica.org
We report a mathematical formulation that successfully describes the holographic
photocurrent that is produced, in strongly absorbing photorefractive materials, by the action …

Speed and diffraction efficiency in feedback-controlled running holograms for photorefractive crystal characterization

MC Barbosa, L Mosquera, J Frejlich - Applied Physics B, 2001 - Springer
We report the measurement of the diffusion length, the Debye screening length and the
quantum efficiency of photoelectron generation in strongly light absorbing photorefractive Bi …

Experimental comparison of the ac field and the moving-grating holographic-recording techniques for Bi12SiO20 and Bi12TiO20 photorefractive crystals

SL Sochava, EV Mokrushina, VV Prokof'ev… - JOSA B, 1993 - opg.optica.org
It is shown that the two-wave amplification in an alternating field in photorefractive crystals of
the sillenite family is strongly affected by the drift length of photoinduced charge carriers …

Charge–carrier diffusion length in photorefractive crystals computed from the initial hologram phase shift

AA Freschi, PM Garcia, J Frejlich - Applied physics letters, 1997 - pubs.aip.org
The phase shift between the pattern of light onto a photorefractive crystal and the resulting
hologram at the very beginning of the recording process in two-wave mixing is analyzed and …

Detection of resonance space-charge wave peaks for holes and electrons in photorefractive crystals

I de Oliveira, J Frejlich - JOSA B, 2007 - opg.optica.org
We report nonstationary photorefractive holograms in absorbing Bi_12TiO_20 samples with
different degrees of hole-electron competition exhibiting resonance peaks due to electron …

Photorefractive fringe-locked running hologram analysis in three-dimensional space

MC Barbosa, J Frejlich - Journal of Optics A: Pure and Applied …, 2003 - iopscience.iop.org
We report a new procedure allowing one to use fringe-locked running hologram
experiments to characterize photorefractive materials in a very simple, reliable and direct …

Photorefractive running hologram for materials characterization

I de Oliveira, J Frejlich - JOSA B, 2001 - opg.optica.org
We report a theoretical model for a photorefractive running hologram in bulk-absorbing
materials in the presence of self-diffraction and use this model to analyze experiments for …

Resonance running hologram velocity nonlinearity dependence upon light intensity in photorefractive crystals

I de Oliveira, JF Carvalho, J Frejlich - Applied Physics Letters, 2013 - pubs.aip.org
We report on the nonlinear relation between the resonance hologram velocity and the
recording light irradiance in fringe-locked running hologram experiments carried out on a …

Feedback-controlled running holograms in strongly absorbing photorefractive materials

J Frejlich, AA Freschi, PM Garcia, E Shamonina… - JOSA B, 2000 - opg.optica.org
We propose a mathematical model for the movement in absorbing materials of
photorefractive holograms under feedback constraints. We use this model to analyze the …

Photorefractive response at high modulation depths in Bi_12TiO_20

JE Millerd, MB Klein, GA Brost, BA Wechsler… - Journal of the Optical …, 1992 - opg.optica.org
We present data showing a nonlinear photorefractive response at high modulation depths in
a Bi_12TiO_20 sample when applied ac fields are used. The data are interpreted by means …