Refractive index database

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Optical constants of LiBr (Lithium bromide)
Li 1976: n 0.21–20 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]



297 K (24 °C).


H. H. Li. Refractive index of alkali halides and its wavelength and temperature derivatives. J. Phys. Chem. Ref. Data 5, 329-528 (1976) and references therein.
* Sellmeier formula derivation is based on a single data point and knowledge of the dielectric constants and the characteristic absorption peaks.


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Lithium bromide, LiBr

Lithium bromide (LiBr) is a salt that is most commonly used as a desiccant in air-conditioning systems. It is highly hygroscopic, easily absorbing water from the air. In the realm of optics, it is used less frequently but can serve as a transparent material in the infrared range. LiBr is soluble in water, alcohol, and other polar solvents, and it is generally not suitable for high-power optical applications due to its hygroscopic nature, which can lead to degradation over time when exposed to moisture.