Specific directions of ultrasound propagation in double potassium tungstates for light modulation.
Acousto-optical characteristics of double potassium tungstates are analyzed and specific directions for light modulation are found. First, an important subgroup of elasto-optic coefficients of KYb(WO4)2and KLu(WO4)2crystals are calculated with use of experimental data. It is revealed that with proper choice of ultrasound direction the acousto-optical figure-of-merit approximately 2 times exceeds the maximum value detected in previous experiments. Another unique direction is determined, which permits modulation of randomly polarized light. The elasto-optic characteristics of KYb(WO4)2and KLu(WO4)2crystals are compared to those of previously investigated materials of the same crystal group: KY(WO4)2, KGd(WO4)2.
Institute of Physical Technical and Radioengineering Measurements, 141570, Mendeleyevo, Moscow Region, Russia.
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Institute of Physical Technical and Radioengineering Measurements, 141570, Mendeleyevo, Moscow Region, Russia.
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Mazur
Scientific Technological Center of Unique Instrumentation of Russian Academy of Sciences, ul. Butlerova, 15, 117342 Moscow, Russia; National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe Highway, 31, 115409 Moscow, Russia. Electronic address: v_pozhar@rambler.ru.
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Acousto-optical modulator; Elasto-optic matrix; KGW; KLuW; KYW; KYbW