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The refractive indices of new Nd 3+ : GdVO 4 , Tm 3+ :GdVO 4 , and Er 3+ :GdVO 4 laser crystals were determined with an error of ±5 x 10~5 in the range 400-1100 nm. The birefringence of these crystals was on the average 0.24, and the dispersion was described by the formula I/An 2 = a + b/k 2 . The thermal conductivity of the Nd:GdVO 4 crystal (atomic neodymium concentration 1.3%) was determined in the temperature range 77-300 K. At 300 K the conductivity along the (110) direction was 11.7 W nT 1 K" 1 , which was higher than the conductivity of Nd: YAG crystals.

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