Abstract
Electrooptic single crystals having a room temperature tetragonal tungsten bronze-type structure were grown from the pseudosystem KNbO 3LiNbO 3BaNb 2O 6 using covered platinum crucibles cooled at 2°C/hr. The largest and best quality crystals were grown from molten solutions with compositions approximately between K 3Li 2Nb 5O 15 and KBa 2Nb 5O 15. The K 3Li 2Nb 5O 15 functions as a flux and the compositions of the grown crystals lie close to KBa 2Nb 5O 15. These tungsten bronze-type crystals, which can be represented as KBa 2Nb 5O 15 solid solutions with LiNbO 3 and K 3Li 2Nb 5O 15, are not microtwinned and a large range of the bronze compositions phase match the Nd:YAG laser (1.06 μ) for second harmonic (0.53 μ) generation without double refraction above room temperature.
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