Refractive index database

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Optical constants of In (Indium)
Golovashkin et al. 1967: n,k 0.55–10 µm; 4.2 K

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Conditions & Spec sheet

temperature: 4.2 K


4.2 K (-268.95 °C)


A. I. Golovashkin, I. S. Levchenko, G. P. Motulevich, A .A. Shubin. The optical properties of indium, Sov. Phys. JETP 24, 1093-1100 (1967)


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Indium, In

Indium (In) is a soft, malleable metal that is primarily used in the electronics industry for making semiconductors, transistors, and a variety of other components. In the realm of optics, indium is often employed in the fabrication of photodetectors and infrared sensors due to its unique electronic properties. Indium-tin oxide (ITO) is a transparent conductive oxide that serves as a popular material for making touch screens, LED displays, and solar cells. Indium is also frequently used to create low-melting alloys for a variety of other technological applications. Despite its widespread use, indium is relatively rare and expensive. Precautions should be taken when handling indium compounds due to potential toxicity.

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