SINGLE-MODE DOUBLE-LAYER CRYSTALLINE INFRARED OPTICAL WAVEGUIDE Russian patent published in 2011 - IPC G02B6/02 

FIELD: physics.

SUBSTANCE: invention relates to a single-mode double-layer crystalline infrared optical waveguide for the 2-45 mcm spectral range and can be used to make thermal imaging fibre cables, sensors and optical fibre lasers for the middle infrared range and spatial filter elements. The optical waveguide based on solid solutions of silver bromide - thallium (I) iodide has a core with diametre of 10-130 mcm, having components in the following ratio in wt %: silver bromide 97.0-90.0, thallium (I) iodide 3.0-10.0. The cladding is double-layered. The first layer of the cladding with diametre of 100-300 mcm is made from solid solutions of silver bromide - thallium (I) iodide, with the following ratio of components in wt %: silver bromide 99.5-97.0, thallium (I) iodide 0.5-3.0. The second layer of the cladding which has diametre of 0.9-1.15 mm is made from solution solutions of silver bromide - thallium (I) iodide, with the following ratio of components in wt %: silver bromide 94.0-98.0, thallium (I) iodide 6.0-2.0.

EFFECT: broader spectral range of transparency of the optical waveguide, increase in photo-resistance and hardness of the optical waveguide, possibility of inhibiting diffusion between the core and the cladding, a clear circular boundary between the core and cladding.