KYW crystal as a new material for acousto-optical Q-switches

Yushkov, Konstantin B.; Chizhikov, Alexander I.; Naumenko, Natalya; Molchanov, V. N.; Pavlyuk, A. A.; Makarevskaya, E. V.; Zakharov, N. G.

doi:10.1117/12.2503776

Cited by 9 publications

(6 citation statements)

References 9 publications

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“…16,17 Potassium rare-earth tungstate crystals, KGW (KGd(WO 4 ) 2 ) and KYW (KY(WO 4 ) 2 ), have a relatively high AO figure of merit M 2 quite comparable to that of paratellurite (TeO 2 ) for isotropic diffraction. 18 Besides that, these crystals are known to have a high laser-induced damage threshold of > 20 J/cm 2 for nanosecond pulses. 19,20 Combination of high AO efficiency with good optical properties made them suitable for modulation and Q-switching of high-power middle-infrared lasers.…”

Section: Analysis Of Diffraction Geometrymentioning

confidence: 99%

“…19,20 Combination of high AO efficiency with good optical properties made them suitable for modulation and Q-switching of high-power middle-infrared lasers. 18,[20][21][22] Isotropic diffraction in KYW crystal with high figure of merit M 2 takes place in X 1 X 3 plane with the acoustic beam propagating orthogonally to X 2 axis, Fig. 2 (a).…”

Section: Analysis Of Diffraction Geometrymentioning

confidence: 99%

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Two-dimensional acousto-optic SLM

Chizhikov

Molchanov

Naumenko

et al. 2022

Holography, Diffractive Optics, and Applications XII

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A prototype of two-coordinate spatial light modulator (SLM) based on acousto-optic diffraction in KY(WO4)2 monoclinic crystal is proposed. The SLM design is based on a special configuration of isotropic Bragg diffraction in monoclinic crystals, which used autocollimation of the acoustic beams and operation with unpolarized light. This enables a unique design of a two-coordinate Bragg cell, which can be used as a monolithic X-Y deflector or as an SLM. Experimental results and limitations of the prototype performance are discussed in the report. Overall efficiency over 50% at 4 W of driving RF power has been demonstrated for the laser wavelength of 532 nm. Optical modulation rise/fall time is ~220 ns/mm for each coordinate.

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Section: Analysis Of Diffraction Geometrymentioning

confidence: 99%

Section: Analysis Of Diffraction Geometrymentioning

confidence: 99%

Two-dimensional acousto-optic SLM

Chizhikov

Molchanov

Naumenko

et al. 2022

Holography, Diffractive Optics, and Applications XII

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“…KGW is a laser host and nonlinear optical crystal. The family of potassium rare-earth tungstates has been recently rediscovered as a group of promising acousto-optic materials owing to their high laser damage threshold, good mechanical and thermophysical properties, established growth technology and processability [32,33,37].…”

Section: Potassium Gadolinium Tungstate (Kgw)mentioning

confidence: 99%

“…In this region, we predict almost spreading-free propagation of ultrasonic BAW beams because the diffraction coefficients are small, w 31 = −0.45 and w 32 = −0.62. An autocollimation point of the same kind for the slow quasishear wave in XY plane exists in potassium yttrium tungstate (KY(WO 4 ) 2 ) crystals having similar properties to KGW [37].…”

Section: Autocollimation Directionsmentioning

confidence: 99%

“…A certain exception are some recent works [28,29,30,31]. In last years, attention has been focused on crystals of lower symmetry systems, namely orthorhombic and monoclinic ones [32,33,34,35,36,37]. Acousto-optic interaction at GHz-range frequencies in anisotropic microstructures and resonators is also at the edge of applied research [38,39,40,41].…”

Section: Introductionmentioning

confidence: 99%

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Extreme acoustic anisotropy in crystals visualized by diffraction tensor

Науменко¹,

Yushkov²,

Molchanov³

2019

Preprint

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Acoustic wave propagation in single crystals, metamaterials and composite structures is a basic mechanism in acoustic, acousto-electronic and acousto-optic devices. Acoustic anisotropy of crystals provides a variety of device performances and application fields, but its role in pre-estimation of achievable device characteristics and location of crystal orientations with desired properties is often underestimated. A geometrical image of acoustic anisotropy can be an important tool in design of devices based on wave propagation in single crystals or combinations of anisotropic materials. We propose a fast and robust method for survey and visualization of acoustic anisotropy based on calculation of the eigenvalues of bulk acoustic wave (BAW) diffraction tensor (curvature of the slowness surface). The stereographic projection of these eigenvalues clearly reveals singular directions of BAW propagation (acoustic axes) in anisotropic media and areas of fast or slow variation of wave velocities. The method is illustrated by application to three crystals of different symmetry used in different types of acoustic devices: paratellurite, lithium niobate, and potassium gadolinium tungstate. The specific features of acoustic anisotropy are discussed for each crystal in terms of their potential application in devices. In addition, we demonstrate that visualization of acoustic anisotropy of lithium niobate helps to find orientations supporting propagation of high-velocity surface acoustic waves.

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