Abstract
Significant improvements have been made in the quality of barium sodium niobate crystals and material with very high optical quality and low optical loss has been produced. Comparisons with previously available material can be made by means of schlieren photography and parallel light interference methods. A technique for determining absorption coefficients by differential temperature measurements has been developed and optical absorption coefficients as low as 0.0003 cm -1 at 1.06 μm have been measured.
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