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Three-Stage Bragg Diffraction of Bessel Light Beams by Ultrasound in Uniaxial Crystals
Abstract
The non-collinear three-fold acoustooptic diffraction of Bessel light beams by ultrasound in uniaxial crystals is investigated. An expression for the complex vector amplitude of a wave diffracted under conditions of exact Bragg synchronism is obtained in the vector-matrix form. It is established that when a Bessel light beam propagates at a small angle to the optical axis of the crystal, the diffracted light beams display three-fold Bragg diffraction with different efficiency. If the conditions of Bragg synchronism are exactly fulfilled, a diffraction case is possible when the diffracted light beams have the same intensity; in the absence of Bragg synchronism, this diffraction feature is not observed. With large frequency detuning of the Bragg synchronism, the light intensity in the third diffraction order is significantly reduced (up to zero).
About the Authors
G. V. Kulak
I.P. Shamyakin Mozyr State Pedagogical University
Belarus
Belarus
Mozyr, 247760.
S. V. Kulakov
Saint Petersburg State University of Aerospace Instrumentation
Russian Federation
Russian Federation
Saint Petersburg.
P. I. Ropot
B.I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus
Belarus
Belarus
Minsk.
O. V. Shakin
Saint Petersburg State University of Aerospace Instrumentation
Russian Federation
Russian Federation
Saint Petersburg.
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Review
For citations:
Kulak G.V., Kulakov S.V., Ropot P.I., Shakin O.V. Three-Stage Bragg Diffraction of Bessel Light Beams by Ultrasound in Uniaxial Crystals. Zhurnal Prikladnoii Spektroskopii. 2021;88(3):493-498. (In Russ.)
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