Bright light dots caused by interference of parametric scattering processes in LiNbO_3 crystals

Lithium niobate (LiNbO 3 ) and lithium tantalate (LiTaO 3 ) crystals have gained increasing interest during recent years because of their fascinating physical properties, such as piezoelectricity, ferroelectricity, pyroelectricity, birefringence, electrooptical, and nonlinear-optic effects. These properties have been successfully utilized for applications in various fields. Basic experiments on acoustic surface wave propagation, electrooptical modulation, optical wave guiding, second harmonic generation, and pyroelectric detection have been performed with these crystals.LiNbO 3 and its isomorphous compound LiTaO 3 are not found in nature. The first successful growth of large single crystals by the Czochralski technique was reported by Ballman [1]. A peculiarity results from the fact that the congruently melting composition (about 48.4 mol % Li 2 O) does not coincide with the stoichiometric one (50 mol % Li 2 O). The crystals have a perovskite-like structure with oxygen octahedra and are trigonal with only one structural phase transition (paraelectric-ferroelectric) at the Curie temperature T c of about 1150 • C for LiNbO 3 and about 610 • C for LiTaO 3 . The nonpolar high-temperature phase belongs to the space group R3c (point group 3m) and at T c the transition to the ferroelectric low-temperature phase of the space group R3c (point group 3m) occurs. At room temperature LiNbO 3 is negatively birefringent. The birefringence of LiTaO 3 is very small at room temperature and positive for the congruently melting composition. More information about growth and fundamental properties of LiNbO 3 can be found in [2,3]. 83

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“…19. It has been demonstrated that these dots are caused by constructive interference of four parametric scattering processes [179].…”

Section: Holographic Scatteringmentioning

confidence: 99%

Photorefractive Effects in LiNbO3 and LiTaO3

Buse

Imbrock

Krätzig

et al.

Photorefractive Materials and Their Applications 2

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Optical Materials and Their Properties

Brinkmann¹,

Hayden²,

Letz

et al. 2012

Springer Handbook of Lasers and Optics

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Photorefractive parametric scattering in the ferroelectric relaxor SBN: Phenomenological and application aspects

et al. 2005

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This paper is dedicated to the study of a new class of light-induced parametric scattering recently found in photorefractive Sr 0.61 Ba 0.39 Nb 2 O 6 :Cr ͑SBN:Cr͒. The scattering consists of polarization-isotropic cones induced by two pump beams and forming series of vertical lines on the observation screen. It is due to a type of 4WM processes between pump and scattering waves involving the fundamental grating recorded by the pump beams. A complete phenomenological analysis of the new 4WM model is presented. The scattering hysteresis under external fields and the temperature evolution of the new scattering are studied. It is shown that the parametric scattering is a useful tool for studying ferroelectric and relaxor properties of SBN.

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Bright light dots caused by interference of parametric scattering processes in LiNbO_3 crystals

Cited by 3 publications

References 16 publications

Photorefractive Effects in LiNbO3 and LiTaO3

Photorefractive Effects in LiNbO3 and LiTaO3

Optical Materials and Their Properties

Photorefractive parametric scattering in the ferroelectric relaxor SBN: Phenomenological and application aspects

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