Photorefractive Diffraction Gratings in KTN:Cr, Fe in the Paraelectric Phase Using the Quadratic Electrooptic Effect

Aharon Agranat; Koichi Sayano; Amnon Yariv

doi:10.1364/PRM.1987.PD1

Topical Meeting on Photorefractive Materials, Effects, and Devices
Technical Digest Series (Optica Publishing Group, 1987),
paper PD1
•https://doi.org/10.1364/PRM.1987.PD1

Photorefractive Diffraction Gratings in KTN:Cr, Fe in the Paraelectric Phase Using the Quadratic Electrooptic Effect

Aharon Agranat, Koichi Sayano, and Amnon Yariv

Photorefractive Materials 1987

Los Angeles, California United States
12–14 August 1987
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A. Agranat, K. Sayano, and A. Yariv, "Photorefractive Diffraction Gratings in KTN:Cr, Fe in the Paraelectric Phase Using the Quadratic Electrooptic Effect," in Topical Meeting on Photorefractive Materials, Effects, and Devices, Technical Digest Series (Optica Publishing Group, 1987), paper PD1.

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Abstract

Potassium tantalate niobate (KTN) was one of the first photorefractive (PR) crystals to be discovered^(1,2,3). However since its discovery, very little has been done in order to explore its PR properties.

The chemical composition of KTN is given by KTa_1−xNb_xO₃ where x denotes the niobium concentration. KTN undergoes a ferroelectric phase transition at a temperature T_c which depends on x (roughly 8.5K/1% per mole of Nb). For low Nb concentrations the phase transition is second order and it becomes first order for x ≥ 0.3.⁽⁴⁾

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