PHOTONIC CRYSTAL LIGHT GUIDE WITH LARGE MODE FIELD DIAMETER Russian patent published in 2025 - IPC G02B6/02 C03C13/04 

FIELD: physics.

SUBSTANCE: invention relates to radiation-resistant photonic-crystal light guides for operation at wavelengths of 12.0-14.0 mcm, in which single-mode operation is maintained. Disclosed infrared light guide with a large mode field diameter includes a core and a cladding consisting of rods of the same diameter. Core has diameter of 290-300 mcm, and the shell has diameter of 1.1-1.2 mm, in which there are rods with diameter of 18-20 mcm, located in a hexagonal order at distance of 145-155 mcm between their centres. Rods are made from crystals based on solid solutions of thallium bromide-iodide of the composition TlBr_0.46I_0.54, containing silver chloride-bromide of composition AgCl_0.25Br_0.75, and the core and the cladding are made of crystals based on solid solutions.

EFFECT: high detection capacity of space onboard equipment when monitoring outer space at wavelengths of 12-14 mcm.

1 cl, 1 dwg