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Anisotropy of acoustooptic figure of merit in KH2PO4 crystals

Mys O., Krupych O. and Vlokh R.

Vlokh Institute of Physical Optics, 23 Dragomanov Street, 79005 Lviv, Ukraine

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Abstract. We have analyzed the anisotropy of acoustooptic figure of merit M2 for KH2PO4 crystals. Basing on our results, the highest M2 coefficient, 7.1×10–15 s3/kg, is achieved for the case of isotropic acoustooptic interaction. Then the optical wave, which is polarized in the XY plane and propagates along the direction [-110], interacts with the longitudinal acoustic wave propagating in the same plane along [110]. For the case of anisotropic interactions, the maximum M2 value is smaller, 5.3×10–15 s3/kg. Then the slow transverse acoustic wave propagating in the XZ or YZ planes close to the X axis interacts with the optical wave propagating close to the optic axis.

Keywords: anisotropy, acoustooptic figure of merit, acoustic wave velocity, elastooptic coefficients, KH2PO4 crystals, acoustooptic tunable filters

PACS: 78.20.hb, 78.20.Ci, 42.70.-a, 85.60.-q
UDC: 535.42+ 535.012.21+ 535.551
Ukr. J. Phys. Opt. 18 83-94
doi: 10.3116/16091833/18/2/83/2017
Received: 15.03.2016

Анотація. У роботі проаналізовано анізотропію коефіцієнта акустооптичної якості кристалів KH2PO4. Показано, що найвище значення цього коефіцієнта (7.1×10–15 с3/кг) досягається при ізотропній акустооптичній взаємодії поляризованої в площині XY оптичної хвилі, яка поширюється вздовж напрямку [-110], із поздовжньою акустичною хвилею, яка поширюється в цій же площині в напрямку [110]. У разі анізотропної дифракції максимальне значення коефіцієнта M2 менше (5.3×10–15 с3/кг) і відповідає взаємодії повільної поперечної акустичної хвилі, яка поширюється в площинах XZ або YZ у напрямку близькому до осі X, з оптичною хвилею, яка поширюється майже вздовж оптичної осі кристала. 
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