Anisotropic light diffraction in crystals with a large acoustic-energy walk-off

Balakshy, V. I.; Voloshin, Andrey S.; Molchanov, V. N.

doi:10.1134/s0030400x14110046

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…The second one is a diffracted wave with the wave vector

and the diffraction angle

. The interaction of these waves is described by the following system of equations [ 15 ]:

where, for the convenience of numerical calculations, dimensionless values are introduced: the normalized amplitudes of the incident

and diffracted

waves, the coordinate

, the Raman–Nath parameter

and dimensionless phase mismatch

…”

Section: Acousto-optic Effect In the Field Of Phased-array Transdumentioning

confidence: 99%

Acousto-Optic Cells with Phased-Array Transducers and Their Application in Systems of Optical Information Processing

et al. 2021

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This paper presents the results of theoretical and experimental studies of anisotropic acousto-optic interaction in a spatially periodical acoustic field created by a phased-array transducer with antiphase excitation of adjacent sections. In this case, contrary to the nonsectioned transducer, light diffraction is absent when the optical beam falls on the phased-array cell at the Bragg angle. However, the diffraction takes place at some other angles (called “optimal” here), which are situated on the opposite sides to the Bragg angle. Our calculations show that the diffraction efficiency can reach 100% at these optimal angles in spite of a noticeable acousto-optic phase mismatch. This kind of acousto-optic interaction possesses a number of interesting regularities which can be useful for designing acousto-optic devices of a new type. Our experiments were performed with a paratellurite (TeO2) cell in which a shear acoustic mode was excited at a 9∘ angle to the crystal plane (001). The piezoelectric transducer had to nine antiphase sections. The efficiency of electric to acoustic power conversion was 99% at the maximum frequency response, and the ultrasound excitation band extended from 70 to 160 MHz. The experiments have confirmed basic results of the theoretical analysis.

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“…The second one is a diffracted wave with the wave vector

and the diffraction angle

. The interaction of these waves is described by the following system of equations [ 15 ]:

where, for the convenience of numerical calculations, dimensionless values are introduced: the normalized amplitudes of the incident

and diffracted

waves, the coordinate

, the Raman–Nath parameter

and dimensionless phase mismatch

…”

Section: Acousto-optic Effect In the Field Of Phased-array Transdumentioning

confidence: 99%

Acousto-Optic Cells with Phased-Array Transducers and Their Application in Systems of Optical Information Processing

et al. 2021

View full text Add to dashboard Cite

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“…Можно показать, что в случае пересечения столба под произвольным углом результат АО дифракции почти эквивалентен случаю пересечения другого акустического столба (это подтверждается анализом работ [19,20]). Этот эквивалентный столб должен иметь те же параметры звука, за исключением ширины столба и ориентации параллельных границ.…”

Section: о стационарной функции пропускания при акустооптической фильunclassified

Особенности Формирования Многополосной Функции Пропускания На Базе Многочастотной Акустооптической Дифракции

Проклов¹,

Резвов²

2018

Журнал Технической Физики

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“…Precise theoretical consideration and modeling give a chance to predict and protect the characteristic degradation at the design stage, but the real structure of an acoustic field may only be revealed experimentally. It is barely possible to reveal and quantify crystal inhomogeneity and inner defects, heat generation by the piezoelectric transducer, multiple reflections of ultrasound from AO cell facets, and many other factors without experiments [ 6 , 7 , 8 ]. Therefore, it is essential to carefully examine each assembled AO cell and certify it in terms of the real acoustic field structure.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Acoustic Waves in Acousto-Optical Devices by Ultrasonic Imaging

2022

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The structure of the acoustic field defines the key parameters of acousto-optical (AO) devices. To confirm their compliance with the expected values in the presence of multiple real factors, AO crystalline cells require accurate experimental investigation of the acoustic field after being totally assembled. For this purpose, we propose to detect and quantify all the acoustic waves propagating in AO cells using an impulse acoustic microscopy technique. To validate this approach, we have analyzed both theoretically and experimentally the modes, amplitudes, propagation trajectories, and other features of the ultrasonic waves generated inside an AO modulator made of fused quartz. Good correspondence between theoretical and experimental data confirms the effectiveness of the proposed technique.

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Anisotropic light diffraction in crystals with a large acoustic-energy walk-off

Cited by 9 publications

References 14 publications

Acousto-Optic Cells with Phased-Array Transducers and Their Application in Systems of Optical Information Processing

Acousto-Optic Cells with Phased-Array Transducers and Their Application in Systems of Optical Information Processing

Особенности Формирования Многополосной Функции Пропускания На Базе Многочастотной Акустооптической Дифракции

Evaluation of Acoustic Waves in Acousto-Optical Devices by Ultrasonic Imaging

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