Reduction of the space-charge field in photorefractive crystals

Kimmo Paivasaari (1) , Alexei A. Kamshilin (1) , Philippe Delaye (2) , Gérald Roosen (2)

1 University of Joensuu
2 Laboratoire Charles Fabry de l'Institut d'Optique / Manolia

The space-charge-field amplitude inside photorefractive crystals was evaluated using three different experimental techniques: (i) two-wave mixing gain measurements, (ii) direct phase demodulation under external dc-electric field, and (iii) phase demodulation under ac-field with proper polarization filtering. The experimental data could be simultaneously fitted with the theory in the frame of the traditional one-level photorefractive model only if an additional reduction of the space-charge field is assumed. The traditional model fails to explain appearance of this reduction factor. Measurements were carried out with Bi12TiO20 and GaP photorefractive crystals

Domaines: Optique [physics.optics]

Kimmo Paivasaari, Alexei A. Kamshilin, Philippe Delaye, Gérald Roosen. Reduction of the space-charge field in photorefractive crystals. Optics Communications, 2002, 213, pp.357-366. ⟨10.1016/S0030-4018(02)02082-5⟩. ⟨hal-00686039⟩