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Investigation of anomalous acoustooptic interaction in lithium niobate crystal

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Abstract

Expressions are derived for the calculation of the central frequencies f 1,2 0 , and the frequency band δf of wide-band anomalous acoustooptic interaction in crystals of arbitrary symmetry class. The effect of the difference between the ray and phase velocities of the diffracted light on the magnitude of f 1,2 0 and δf is pointed out. Results are presented of the computed acoustooptic quality factor M2, the frequencies f 1,2 0 , δf and the electromechanical coupling constant for the tangential field kD for cuts of LiNbO3 crystals ensuring maximum diffraction efficiency. It is shown that the maximum M2=22.10−18 cgs units in this crystal is attained in the case of anomalous light diffraction by the slow shear wave propagating in the Y-120‡ direction. To the same cut there corresponds the maximum KD=0.685. The design of anomalous acoustooptic deflectors developed is described. Experimental results are presented.

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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 42–47, July, 1981.

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Demidov, A.Y., Zadorin, A.S. Investigation of anomalous acoustooptic interaction in lithium niobate crystal. Soviet Physics Journal 24, 614–619 (1981). https://doi.org/10.1007/BF00893892

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Keywords

  • Shear Wave
  • LiNbO3
  • Lithium Niobate
  • Diffraction Efficiency
  • Electromechanical Coupling