Refractive index database

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Optical constants of N2 (Nitrogen)
Peck and Khanna 1966: n 0.47–2.06 µm; 15 °C

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula


Conditions & Spec sheet

n_is_absolute: true
wavelength_is_vacuum: true
temperature: 15 °C
pressure: 101325 Pa


15 °C, 760 torr (101.325 kPa)


E. R. Peck and B. N. Khanna. Dispersion of nitrogen, J. Opt. Soc. Am. 56, 1059-1063 (1966)


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


Nitrogen, N2

Nitrogen (N2) is a diatomic gas that makes up approximately 78% of the Earth's atmosphere by volume. It is a colorless, odorless, and tasteless gas that is largely inert under standard conditions, resulting in its use as an unreactive blanket in many industrial applications. In the context of optics, nitrogen is commonly used as a purge gas to displace air and prevent condensation or contamination in high-power laser systems, optical instruments, and other sensitive equipment. Liquid nitrogen, which is nitrogen in its cryogenic liquid state, is employed as a coolant for infrared detectors and other electronic components. Its transparency in the visible and infrared regions makes it an ideal medium for certain optical experiments and applications.

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