Anisotropy of piezo-optic and elasto-optic effects in langasite family crystals

Demyanyshyn, N. M.; Suhak, Yuriy; Mytsyk, B. G.; Buryy, Oleh; Maksishko, Yu. Ya.; Sugak, D.; Fritze, Holger

doi:10.1016/j.optmat.2021.111284

Cited by 6 publications

(2 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…21 Ultimately, higher acousto-optical efficiency CGG may be reached via optimization of the geometry of acousto-optical coupling. Relevant approaches 22,23,32,42,45 consider indicative M 2 -surfaces which characterize the spatial anisotropy of the acousto-optic efficiency. It is noteworthy that actual work provides a full set of photoelastic tensor constants p im necessary for calculating the indicative surfaces.…”

Section: Piezooptic Interferometric Measurements and Their Analysismentioning

confidence: 99%

“…14 All this makes the crystals of the langasite group unique and suitable for wide range of applications in acousto-and optoelectronic devices. [14][15][16][17][18] Optical characterization of LGS type crystals has been concentrated basically on luminescent, refractive, spectroscopic, 9,19,20 photoelastic, and acousto-optic [21][22][23] properties in recent years. Derived in these studies, photoelastic and acousto-optic characteristics evidently indicate that LGS and CTGS crystals represent efficient acousto-optic materials suitable for light modulation in the ultraviolet spectral region.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of photoelastic materials by Mach–Zehnder interferometry: Application to trigonal calcium galogermanate (CGG) crystals

Mytsyk,

Demyanyshyn,

Andrushchak

et al. 2024

Journal of Applied Physics

View full text Add to dashboard Cite

We explore piezooptic and photoelastic properties of Ca3Ga2Ge4O14 (CGG) crystals. A Mach–Zehnder interferometry technique is utilized to determine a complete set of the piezooptic tensor constants πim, with particular attention to the measurement accuracy, reliability, and uncertainty resolution in the piezooptic measurements. For these reasons, independent piezooptic constants or their combinations were determined by performing interferometric measurements for different geometries of piezooptic coupling using samples of both principal (direct) and non-principal (X/45°) crystallographic cuts. Basing on the results of piezooptic measurements, a complete set of photoelastic tensor constants pim and the acousto-optic performance (figure of merit M2) of CGG crystals were evaluated. The obtained piezooptic, photoelastic, and acousto-optic characteristics of CGG crystals are compared with those of other crystals of the langasite group, langasite and CTGS (Ca3TaGa3Si2O14). A comparative analysis reveals a correlation between the values of the piezooptic or photoelastic constants and the lattice parameters for this group of crystals. High optical quality and optical transparency in the UV region of the spectrum up to 260 nm together with extremely high mechanical resistance to uniaxial compression (≤2000 kg/cm2) opens up the possibility for specific application of CGG crystal as an optical material for piezooptic sensors of high uniaxial compression. The presented piezooptic interference technique along with methodological and metrological approaches paves the way for accurate and unambiguous characterization of photoelastic crystal materials of trigonal symmetry.

show abstract

Section: Piezooptic Interferometric Measurements and Their Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of photoelastic materials by Mach–Zehnder interferometry: Application to trigonal calcium galogermanate (CGG) crystals

Mytsyk,

Demyanyshyn,

Andrushchak

et al. 2024

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

Photoelastic Properties of Stoichiometric Lithium Niobate from First‐Principles Calculations

Pionteck,

Sanna

2024

Physica Status Solidi (a)

View full text Add to dashboard Cite

The linear optical response of lithium niobate under compressive as well as tensile stress is calculated from first principles. For this purpose, the elastic constants are computed with different exchange‐correlation functionals and compared with available experimental values. A good agreement with the measured quantities is obtained. A full set of the piezo‐optic and photoelastic coefficients is determined from the dependence of the dielectric permeability in the linear regime on the considered stress. The calculated coefficients agree with the experimental values as well. In contrast to the numerous experimental investigations, the coefficients are not only given for a single excitation wavelength but also within the technically relevant optical range. From the dispersion of the piezo‐optic and photoelastic coefficients, conclusions can be drawn about the refractive indices and the birefringence under strain for different excitation energies. It can be concluded that the birefringence in the long wavelength range increases under stress in the z direction. For uniaxial stress in x and y directions, the lattice symmetry is broken and the crystal becomes biaxial in the x and y directions as well.

show abstract