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An Yb : YVO 4 single crysal with good optical quality and large size has been grown by the Czochralski method. We have discussed the growth shape of Yb : YVO 4 single crystal which is composed of f100g and f101g simple forms. The data of thermal expansion and specific heat of the crystal have been measured. The thermal expansion coefficients along a-and c-axis directions are a 1 1X5 Â 10 À6 /K and a 3 8X2 Â 10 À6 /K, respectively. The specific heat is 30.4 cal/mol K at 320 K. The absorption and fluorescence spectra have been measured.

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