Influence of Photoelastic and Piezoelectric Effects on the Energetic Characteristics of Transmission and Reflection Holo
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Journal of Applied Spectroscopy, Vol. 87, No. 4, September, 2020 (Russian Original Vol. 87, No. 4, July–August, 2020)
INFLUENCE OF PHOTOELASTIC AND PIEZOELECTRIC EFFECTS ON THE ENERGETIC CHARACTERISTICS OF TRANSMISSION AND REFLECTION HOLOGRAMS IN A PHOTOREFRACTIVE CRYSTAL V. N. Naunyka,a* V. V. Shepelevich,a A. V. Makarevich,a and S. M. Shandarovb
UDC 535.4:548.0
The surface of the normal component of the inverse tensor of the dielectric permittivity of a cubic photorefractive piezoelectric Bi12SiO20 crystal was constructed. A volume phase holographic grating with a wave vector along the [ 111 ] crystallographic axis was recorded in this crystal. It is established that the combined action of the photoelastic and piezoelectric effects leads to an increasing normal component of the inverse tensor of the dielectric permittivity along the [ 111 ] direction and a decreasing normal component of the inverse tensor of the dielectric permittivity in the perpendicular direction. It is revealed that the anisotropy of the contribution of the photoelastic and piezoelectric effects causes an increase in the output energetic characteristics (optimized in the azimuth of polarization of light waves) for the transmission hologram and their decrease for the reflection hologram. Keywords: hologram, photorefractive crystal, dielectric permittivity, photoelastic effect, piezoelectric effect, diffraction efficiency, relative intensity of the object wave. Introduction. The combined action of the photoelastic and inverse piezoelectric effects (hereinafter referred to as the "piezoelectric effect") leads to an additional change in the permittivity tensor of the photorefractive piezoelectric crystal at optical frequencies [1]. The piezoelectric effect can affect the properties of a volume phase hologram formed in a cubic photorefractive crystal [2]. It was shown in [3] that for a Bi12SiO20 (BSO) crystal of cut (1 10) , the dependences of the diffraction efficiency of a transmission hologram on the orientation angle, obtained as a result of theoretical calculations and experimentally, are in satisfactory agreement when taking into account the combined action of the linear electro-optical effect, piezoelectric effect, and optical activity. A review of scientific publications on the study of the piezoelectric effect in photorefractive crystals and its influence on the properties of volume phase holograms is presented in [4]. The work [5] is devoted to a theoretical analysis of the influence of optical activity and piezoelectric effect on the dependence of the relative intensity γ of the object wave on the thickness d of the crystal and the orientation angle θ in the case of two-wave interaction on a transmission hologram in a photorefractive crystal of BSO with a (1 10) cut. The orientation angle θ was measured from the crystallographic direction [001] to the wave vector K of the transmitting hologram when it was rotated in the plane of the crystal cut. It has been found that in the case when light waves have linear or circular polarizations
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