Mykola V. Kaidan,
Anna V. Zadorozhna,
Anatolij S. Andrushchak,
and Andriy V. Kityk
M. V. Kaidan, A. V. Zadorozhwa, and A. S. Andrushchak are with the Institute of Physical Optics, Dragomanov Str. 23, 79005, L’viv, Ukraine.
A. V. Kityk (kityk@ap.univie.ac.at) is with the Institute for Computer Science, Department of Electrical Engineering, Technical University of Czestochowa, Al. Armii Krajowej 17, PL-42200, Czestochowa, Poland.
Mykola V. Kaidan, Anna V. Zadorozhna, Anatolij S. Andrushchak, and Andriy V. Kityk, "Photoelastic and acousto-optical properties of Cs2HgCl4 crystals," Appl. Opt. 41, 5341-5345 (2002)
We use a Mach–Zehdner interferometric technique to study the piezo-optical properties of Cs2HgCl4 crystals at room temperature. All piezo-optical (πmn) and photoelastic (pin) tensor constants are obtained. A substantial photoelastic effect and low ultrasonic velocities in these crystals determine a relatively high figure of merit M2 for isotropic diffraction (for a certain geometry of acousto-optical interactions, M2 ∼ 110 × 10-15 s3/kg). The new material may be considered, therefore, a candidate for applications in acousto-optical devices. The dependence of the acoustic walk-off angle on the direction of sound propagation is calculated for the principal crystallographic planes.
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The mechanical compression is parallel to the principal crystallographic direction.
Driving effective half-wave mechanical stress: σkm° = σmλ/2tk, where σmλ/2 is half-wave mechanical stress, tk is the thickness of the sample along the direction of light propagation, k is the direction of light propagation, m is the direction of sample compression, and i is the direction of light polarization.
Table 2
Piezo-Optical Effect in Cs2HgCl4 Crystals Measured on X/45°-, Y/45°-, and Z/45°-Cut Samplesa
Sample Geometry
Measured Effectve Piezo-optical Constant
Values Calculated from Interferometric Measurements
All values are in units of Br (=10-12 m2/N). The mechanical compression is parallel to the [110], [101], or [011] direction.
Effective values calculated from the data presented in Table
1.
Table 3
Calculated Photoelastic Constants pef and Figure of Merit M2 for Cs2HgCl4 Crystalsa
The figure of merit is calculated only for the principal crystallographic directions.
L, T, the longitudinal and the transverse acoustic waves, respectively.
The mechanical compression is parallel to the principal crystallographic direction.
Driving effective half-wave mechanical stress: σkm° = σmλ/2tk, where σmλ/2 is half-wave mechanical stress, tk is the thickness of the sample along the direction of light propagation, k is the direction of light propagation, m is the direction of sample compression, and i is the direction of light polarization.
Table 2
Piezo-Optical Effect in Cs2HgCl4 Crystals Measured on X/45°-, Y/45°-, and Z/45°-Cut Samplesa
Sample Geometry
Measured Effectve Piezo-optical Constant
Values Calculated from Interferometric Measurements
All values are in units of Br (=10-12 m2/N). The mechanical compression is parallel to the [110], [101], or [011] direction.
Effective values calculated from the data presented in Table
1.
Table 3
Calculated Photoelastic Constants pef and Figure of Merit M2 for Cs2HgCl4 Crystalsa
The figure of merit is calculated only for the principal crystallographic directions.
L, T, the longitudinal and the transverse acoustic waves, respectively.