With a bigger birefringence than calcite, sodium nitrate (NaNO₃) single crystals might have potential applications in opto-isolators, circulators and polarizing prisms. However, it is difficult to grow large-size NaNO₃ crystals for their thermal conductivity anisotropy and phase transition at 275 ^oC. In this paper, crack-free NaNO₃ crystals with size of Φ20×100mm³ were prepared by Bridgman method with lower growth rate and lower interface temperature gradient. The behaviors of time dependent on transmittance were measured and analyzed. The refractive indices of NaNO₃ crystal at wavelengths of 0.4730, 0.5320, 0.6328, 1.064 and 1.338 μm were measured by selfcollimating method. From which, we fitted and obtained the Sellmeier’s equation of NaNO₃ crystal. Moreover, the photoluminescence spectra were detected under the excitation of 240 nm, and NaNO₃ crystal presented its fluorescence around 425 nm.         

1. POSTER: Growth and characterization of birefringent crystal NaNO_{3}, JPEG image data, EXIF standard 2.3, 1.9MB

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