Visnyk of the Lviv University. Series Physics
60 (2023) ñ. 90-100
DOI: https://doi.org/10.30970/vph.60.2023.90
Photoelastic properties of ammonium fluoroberyllate crystals
B. Mytsyk, B. Horon, N. Demyanyshyn, V. Stadnyk, P. Shchepanskyi, Ya. Kost
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All independent piezo-optic \piim coefficients of ammonium fluoroberylate (NH4)2BeF4 crystals were determined by the interferometric method using experimental setups based on a single-pass Mach--Zehnder interferometer.
Note that under the action of uniaxial pressure on the sample placed in one of the shoulders of the interferometer, the expression for determining the coefficients \piim has the form \piim = - \frac{\lambda}{ni3\sigmaimo} + 2Skm\frac{ni - 1}{ni3} (ni is the index of refraction, Skm} is the coefficient of elastic compliance, \sigmaimo\sigmaimdk is the control stress, \sigmaim is the half-wave stress and dk is the thickness of the sample in the direction of light propagation).
The geometry of the experiment corresponds to the indices i, k, and m, which indicate the directions of polarization and expansion of light and the direction of action of uniaxial pressure, respectively.
Based on \piim and elastic stiffness coefficients Cmk, all independent elasto-optical coefficients pik were calculated using the product pik = \piimCmk.
It was found that some coefficients \piim have an atypically high value (\sim 10-13~Br).
It was established that all the largest values of piezo-optic and elastic-optic effects correspond to the main coefficients \pi11, \pi23, \pi33 and p11, p22, and p23.
This makes it possible to attribute ammonium fluoroberyllate to the best acousto-optical materials for the ultraviolet region of the spectrum, since the lower limit of the FBA transmission spectrum is in the deep UV region $\sim$~250~nm.
The relative errors of determining the main piezo-optic coefficients are mainly within 13-18 %.
For coefficients \pi44, \pi55, \pi66, the absolute and relative errors are slightly larger than the corresponding errors of the main coefficients \piim.
This is due to the fact that the expressions for calculating such coefficients include complex sums of \piim and Skm coefficients, the errors of which get added up.
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