| 摘要 |
FIELD: physics. ^ SUBSTANCE: method of determining quality of Iceland spar crystals for making polarisers involves measurement of the optical density spectrum of the crystal in the wavelength range from 220 to 400 nm in plane-polarised light. The electric vector of the plane-polarised light is parallel to the optical axis of the crystal. At least two opposite faces of the crystal, parallel to its optical axis, are polished, and the optical axis of the crystal is perpendicular to the incident light. The positions of maximums of the absorption band are determined, as well as the corresponding optical density values, and the quality class of the crystalline material is determined as follows: 1st class - not above 0.31 cm-1, 2nd class - not above 0.35 cm-1, 3rd category - not above 0.45 cm-1. ^ EFFECT: more accurate control of light absorption of crystalline material for making polarisers. ^ 5 dwg, 1 tbl, 1 ex |
