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Refractive index database

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Optical constants of NaI (Sodium iodide)
Jellison et al. 2012: n 0.436–0.633 µm

Wavelength: µm
 (0.436–0.633)  
 

Complex refractive index (n+ik)[ i ]


n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]

$$n^2-1=\frac{1.994λ^2}{λ^2-0.176^2}$$

Comments

Room temperature

References

G. E. Jellison Jr., L. A. Boatner, J. O. Ramey, J. A. Kolopus, L. A. Ramey and D. J. Singh. Refractive index of sodium iodide. J. Appl. Phys. 111, 043521 (2012)

Data

[Expressions for n]   [CSV - comma separated]   [TXT - tab separated]   [Full database record]

INFO

Sodium iodide, NaI

Sodium iodide (NaI) is a white, crystalline solid that can be prepared as transparent crystals suitable for optical applications. Notably, when doped with thallium (NaI:Tl), it becomes a scintillator material, capable of converting incident gamma rays into visible light. This property makes NaI:Tl crystals particularly valuable in radiation detection, gamma spectroscopy, and other nuclear medicine applications. However, NaI, being an alkali halide, is hygroscopic, meaning it readily absorbs moisture from the environment. Therefore, it requires careful handling and storage to prevent degradation, especially if it is to be used in optical systems.

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