Abstract

This paper discusses the process of additive coloration of cadmium fluoride crystals doped with ions of the third column of Mendeleev's periodic system. In this crystal, unlike all other ionic crystals, the electrons introduced by this procedure are localized in the conduction band or on hydrogenlike orbitals centered at impurities. For two of the impurities of the indicated group, gallium and indium, the electrons may also be localized on an inner atomlike shell; these bistable impurities are of special interest in connection with the fact that CdF₂:Ga and CdF₂:In crystals are photochromic. Possible methods are discussed for the additive coloration of cadmium fluoride crystals (in hydrogen, in metal vapor, and in vapor mixtures, in an ampule and in a thermal tube) and for bleaching colored crystals. Comparison of the character of the color distribution over the volume of colored and partially bleached crystals indicated that the defect whose diffusion forms the basis of the process of additive coloration of cadmium fluoride crystals is mobile; this is an anion vacancy.

Optical study of calcium precipitates in additively colored CaF₂ crystals

Aleksandr E. Angervaks, Andrei V. Veniaminov, Maksim V. Stolyarchuk, Vyacheslav E. Vasilev, Irina Kudryavtseva, Pavel P. Fedorov, and Aleksandr I. Ryskin
J. Opt. Soc. Am. B 35(6) 1288-1294 (2018)

The Transmittance of Crystalline Cadmium Fluoride*

H. M. Haendler, C. M. Wheeler, and W. J. Bernard
J. Opt. Soc. Am. 43(3) 215_1-216 (1953)

The Optical Transmission of Additively Colored Alkali Halide Crystals in the Visible and Near Infra-Red

H. Friedman and C. P. Glover
J. Opt. Soc. Am. 39(9) 795-796 (1949)

Birefringence of Cadmium Sulfide Single Crystals

Thomas E. Walsh
J. Opt. Soc. Am. 62(1) 81-83 (1972)

Laser action with (F₂⁺)A centers in additively colored lithium-doped KI

David R. Foster and Irwin Schneider
Opt. Lett. 13(3) 207-208 (1988)