METHOD OF PRODUCING DOUBLE-LAYER SILVER HALIDE INFRARED LIGHT GUIDES Russian patent published in 2024 - IPC G02B6/02 

FIELD: various technological processes.

SUBSTANCE: invention relates to a method of extrusion of a new class of radiation-resistant, non-toxic, non-hygroscopic, ductile and highly transparent in the middle and far infrared ranges of two-layer silver halide infrared light guides based on optimum compositions of monocrystals of the system AgBr_0.7I_0.3 – AgCl. Disclosed method of producing double-layer silver halide infrared light guides involves extrusion of a core and a cladding made from crystals of solid solutions based on silver halides. At that, diameters, chemical compositions and refraction indices of core n₁, cladding n2 and difference between n₁ and n₂ are pre-determined by computer modelling, then making a core with diameter of 300.0 mcm with n₁ equal to 2.195–2.204, from crystals based on a solid solution of the composition AgBr_0.7I_0.3, additionally containing silver chloride at the following ratio of ingredients in mol. %: solid solution AgBr_0.7I_0.3 91.0–95.0; silver chloride 9.0–5.0, and the shell is made with diameter of 400.0 mcm with n₂ equal to 2.181–2.190, from the same crystals with the following ratio of ingredients in mol. %: solid solution AgBr_0.7I_0.3 85.0–9.0; silver chloride 15.0–11.0. Difference between the refraction indices of the core and the cladding n₁-n₂ is 0.014.

EFFECT: development of a method for obtaining photo- and radiation-resistant silver halide infrared light guides which are non-toxic, non-hygroscopic, plastic and highly transparent without absorption windows in a longer-wavelength spectral range with low optical losses.

2 cl, 2 dwg