Acousto-optic interaction between circularly polarized optical eigenwaves: example of AgGaS<sub>2</sub> crystals

Mys Oksana; Martynyuk-Lototska Iryna; Pogodin Artem; Dudok Taras; Adamenko Dmitro; Krupych Oleh; Skab Ihor; Vlokh Rostyslav

doi:10.1364/AO.58.006012

Applied Optics
Vol. 58,
Issue 22,
pp. 6012-6018
(2019)
•https://doi.org/10.1364/AO.58.006012

Acousto-optic interaction between circularly polarized optical eigenwaves: example of AgGaS₂ crystals

Mys Oksana, Martynyuk-Lototska Iryna, Pogodin Artem, Dudok Taras, Adamenko Dmitro, Krupych Oleh, Skab Ihor, and Vlokh Rostyslav

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Mys Oksana, Martynyuk-Lototska Iryna, Pogodin Artem, Dudok Taras, Adamenko Dmitro, Krupych Oleh, Skab Ihor, and Vlokh Rostyslav, "Acousto-optic interaction between circularly polarized optical eigenwaves: example of AgGaS₂ crystals," Appl. Opt. 58, 6012-6018 (2019)

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Abstract

We analyze acousto-optic (AO) diffraction occurring at the light wavelength of a so-called “isotropic point” in ${AgGaS}_{2}$ crystals. It is shown that a natural optical activity, which manifests itself as circular birefringence at the isotropic point, can lead to two different types of AO Bragg diffraction, isotropic and anisotropic. The first type concerns the interaction of circularly polarized optical eigenwaves with the same sign of rotations of their electric-field vectors. In the case of the second diffraction type, the AO interaction takes place between the circularly polarized waves having opposite signs of electric-field rotations. Relations for effective elasto-optic (EO) coefficients are derived for different types of AO diffraction, including a collinear one. The main peculiarities of the latter diffraction type are revealed. The modules of all the EO coefficients are determined experimentally for the ${AgGaS}_{2}$ crystals, using a Dixon–Cohen method. Finally, we evaluate AO figures of merit referring to the AO interactions of circularly polarized optical eigenwaves at the optical wavelength of the isotropic point.

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AW Velocity, m/s	Direction of Propagation and Polarization of Incident and Diffracted Light	Refractive Index	$M_{2}$ , $10^{- 15} s^{3} / kg$	$\| p_{eff} \|$ ^a
Isotropic Diffraction
$v_{11} = 4230$	$k_{2}$ , $D_{1}$ , $E_{1}$	$n_{o}$	16.1	$\| p_{11} \| = 0.144 \pm 0.004$
	$k_{2}$ , $D_{3}$ , $E_{3}$	$n_{e}$	0.9	$\| p_{31} \| = 0.036 \pm 0.005$
	$k_{3}$ , $D_{1}$ , $E_{1}$	$n_{o}$	16.1	$\| p_{11} \| = 0.144 \pm 0.004$
	$k_{3}$ , $D_{2}$ , $E_{2}$	$n_{o}$	1.4	$\| p_{12} \| = 0.043 \pm 0.005$
$v_{22} = 4230$	$k_{1}$ , $D_{2}$ , $E_{2}$	$n_{o}$	16.1	$\| p_{11} \| = 0.144 \pm 0.004$
	$k_{1}$ , $D_{3}$ , $E_{3}$	$n_{e}$	0.9	$\| p_{31} \| = 0.036 \pm 0.005$
	$k_{3}$ , $D_{1}$ , $E_{1}$	$n_{o}$	1.4	$\| p_{12} \| = 0.043 \pm 0.005$
	$k_{3}$ , $D_{2}$ , $E_{2}$	$n_{o}$	16.1	$\| p_{11} \| = 0.144 \pm 0.004$
$v_{33} = 4016$	$k_{1}$ , $D_{2}$ , $E_{2}$	$n_{o}$	0.6	$\| p_{13} \| = 0.026 \pm 0.003$
	$k_{1}$ , $D_{3}$ , $E_{3}$	$n_{e}$	35.0	$\| p_{33} \| = 0.208 \pm 0.011$
	$k_{2}$ , $D_{1}$ , $E_{1}$	$n_{o}$	0.6	$\| p_{13} \| = 0.026 \pm 0.003$
	$k_{2}$ , $D_{3}$ , $E_{1}$	$n_{e}$	35.0	$\| p_{33} \| = 0.208 \pm 0.011$
Anisotropic diffraction
$v_{12} = 2560$	$\sim 3 \deg$ in respect to $c$ axis in the $a c$ plane, $D_{1}$ , $E_{2}$	$n = 2.5506$ , $n_{o}$	11.0	$\| p_{66} \| = 0.053 \pm 0.003$
$v_{32} = 2264$	Under different angles in respect to $a$ axis in the $a c$ plane, $D_{3}$ , $E_{2}$	$n_{e}$ , $n_{o}$	$< 0.02$	$\| p_{44} \| < 0.003$

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Applied Optics