COLD-LIGHT MIRROR Russian patent published in 1997 - IPC

FIELD: fabrication of dielectric and metallodielectric mirrors mainly for the infra-red spectrum, for technological laser systems inclusive. SUBSTANCE: cold-light mirror has a backing and a coating applied onto it consisting of alternating layers of metal fluorides with a low index of refraction and germanium with a high index of refraction; use is made of additional interlayers with an optical thickness of (0.1-0.5)14 of materials, having an intermediate value of the index of refraction and compression stresses; the coating has appearance P(Pr-fluoride-Pr-Ge) or PGe(Pr-fluoride-Pr-Ge, where P-backing, Pr - interlayer, n>1 - number of periods with thickness /2, and the thickness of the germanium layer adjoining the substrate makes up /4. Either zinc sulfide, or zinc selenide, or arsenic sulfide, or arsenic selenide, or antimony sulfide can be used as material with an intermediate value of the index of refraction and compression stresses. EFFECT: improved design. 2 cl, 4 dwg