Photorefractive Response of Bulk Periodically PoledLiNbO3:Y:Fe at High and Low Spatial Frequencies

Abstract

Polydomain periodically poled samples of iron-doped lithium niobate allow for phase grating recording with the diffraction efficiency close to that ensured by a single-domain sample with identical thickness. At the same time the optical damage induced by a finite transverse size light beam is considerably reduced in the periodically poled sample as compared with single-domain material.

Measurement of laser-induced refractive index change of inverted ferroelectric domain LiNbO_3

“…The ␤ value of the PPLN is lower than that of the cLN. This difference may be attributed to the inverted domain structures of LiNbO 3 crystal, since the photorefractive effect was strongly suppressed in such domain inversion structure crystals [5,6]. The contribution of two-photon absorption is negligible in the nonlinear absorption we measured, since the magnitude of two-photon absorption is three orders of magnitude smaller [11] than our measurement.…”

“…Congruent LiNbO 3 (cLN) crystal possesses photorefractive properties that may cause a change in optical characteristics upon exposure to laser radiation. It was demonstrated that the photorefractive effect was strongly suppressed in periodic ferroelectric domain inversion structure crystals [5,6]. Therefore, it is essential to measure the nonlinear optical absorption and refraction of PPLN crystals.…”

Light Pulse Slowing Down up to 0.025 cm/s by Photorefractive Two-Wave Coupling

“…These include the case of drift charge transport, when the phase shift between the light and index gratings is close to 0 or [9], the case of resonant response relevant to excitation of low-frequency eigenmodes in fast PR materials [14], the use of reflection geometries when the light waves are incident onto the opposite crystal faces and the grating period is very small. Periodically poled materials offer additional advantages for pulse experiments because they combine an efficient buildup of index gratings with the absence of large-scale distortions of light beams [15].…”

Holographic data storage systems

“…46. Effectively, the transfer function has a small value for low spatial frequencies, as the oppositely oriented domains prevent strong buildup of net charges [113].…”