| Sodium nitrate crystals: | NaNO3 |
| Crystals belong to trigonal system | |
| Space group | R3c, uniaxial, negative |
| Unit cell dimensions | a = 5,07A; c = 16,81A |
| Density: | 2,27 g/cm3 |
| Moos' hardness: | 1,5 - 2,0 |
| Transmission range : | 320 - 1800 nm |
| Index of refraction: | no = 1.5874 (D) ne = 1.3361 (D) no-ne = 0.2513 |
| Raman active mode | 1068 cm-1. |
| Crystals has perfect cleavage along face of rhombohedron {1011}. | |
| Crystals are colourless; has no centers of light diffusion; unstressed. This fact make them very perspective when used in polarizing optics. Average change of refractive index ( ? n/cm ) in cut parallel to optic axis is to be 1.5x10-5 for o-beam and 0.8x10-5 for e-beam; in cut perpendicular to optic axis is to be 4.5x10-4. Sodium nitrate crystals can be used as SRS- converters of SHG for neodymium laser. In this case effectivity of radiation conversion to wavelengths 560, 600, 640 nm achieves 60%. Dimensions of pieces for producing element of polarizing optics: 43x43x43 mm3 | |
