Optical constants of CRYSTRAN - Optical materials
TlBr42I58 - KRS5
Complex refractive index (n+ik)
Derived optical constants
Comments
TlBr42I58
KRS5 deep IR material with a high refractive index, KRS5 is used extensively in spectroscopy for ATR prisms, windows and lenses. In conjunction with Germanium, KRS5 can also be used in athermalised IR imaging systems.
KRS-5 crystalises by the sealed-ampoule Stockbarger technique. Starting materials of the highest purity are selected to ensure that there are no anionic absorption bands between 2μm and 16μm and all crystals are checked for quality by using a pathlength of 120mm.
CAUTION: Thallium salts are considered TOXIC and should be handled with care.
REFERENCES:
(1) Rodney and Malitson J.Opt Soc.Am. V46, p 956, 1953
(2) Combes, Ballard, McCarthy: J.Opt Soc.Am. V41, p 215, 1951
(3) Handbook of Optical Constants, ed Palik, V3, ISBN 0-12-544423-0
References
Crystran Ltd.
The Crystran handbook of infra-red and ultra-violet optical materials (5th edition, 2023)
See also
Crystran KRS5 online data sheet
Data
Additional information
Properties of TlBr42I58 - KRS5
density:
-
value: 7371
thermal_dispersion:
-
type: constant
value: -0.000235
thermal_expansion:
-
value: 5.8E-5
hardness:
-
type: Knoop
value: 394000000
melting_point:
-
value: 688
thermal_conductivity:
-
temperature: 293
value: 0.544
youngs_modulus:
-
value: 15850000000
poissons_ratio:
-
value: 0.369
solubility:
-
temperature: 293
value: 0.5