Photorefractive Crystals in Coherent Optical Systems

Multi-Channel Adaptive Interferometers Based on Dynamic Hologram Multiplexing

“…developed more general and more rigorous theoretical model of two-wave mixing in PR crystal which takes into account a vectorial nature of light waves, anisotropic properties of photorefractive materials and anisotropy of light diffraction at a dynamic holographic grating (Sturman, et al, 1999). After decades of studying the PR effect a number of fundamental monographs devoted to wave-mixing in PR materials were written (Petrov, et al, 1983;Petrov, et al, 1991;Solymar, et al, 1996;Sturman & Fridkin, 1992). These books can be recommended to the reader interested in detailed study of PR effect.…”

“…Using the conventional one-trap-one-band model for the charge transfer (Petrov, et al, 1991) and assuming provisionally that the applied field is parallel to the grating vector the space charge-field can be found, within the linear approximation in the contrast of the interference pattern, as…”

Investigation of photorefractive subharmonics in the absence of wave mixing

“…Such a fit corresponds to mt Ӎ 1.2 3 10 26 cm 2 V -1 , which is slightly larger than the values expected for BSO crystals. 17 It should be borne in mind, however, that neglecting the contact losses (typical for many experimental papers) can result in underestimated values for the lifetime -mobility product. The disagreement with respect to the frequency width of the subharmonic generation region is in all probability of experimental origin.…”

“…15 The new experimental arrangement has significant advantages over the traditional longitudinal and transverse optical configurations. 16,17 One point, as mentioned above, is that beam coupling can have no influence whatsoever on the subharmonic excitation. But a potentially greater advantage of the new configuration is the possibility of probing for subharmonics under conditions with a high degree of spatial homogeneity.…”

Exact solution of the Bragg-difEraction problem in sillenites

“…In particular, the generalization is known for the case of anisotropic diffraction in birefringent crystals. 3 ' 4 In this case, a simple solution of the problem is possible because the amount of birefringence considerably exceeds the amplitude of the spatial oscillation of the optical dielectric permittivity.…”