Refractive index database

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Optical constants of Tm (Thulium)
Vidal-Dasilva et al. 2009: n,k 0.000775–0.480 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Conditions & Spec sheet

n_is_absolute: true
wavelength_is_vacuum: true


Density: 9.33 g/cm3. Film deposited at room temperature.


M. Vidal-Dasilva, M. Fernández-Perea, J. A. Aznárez, J. I. Larruquert, J. A. Méndez, L. Poletto, A. M. Malvezzi, A. Giglia, and S. Nannarone. Transmittance and optical constants of Tm films in the 2.75-1600 eV spectral range, J. Appl. Phys. 105, 103110 (2009) (Numerical data kindly provided by Juan Larruquert)


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Thulium, Tm

Thulium (Tm) is a rare-earth metal, belonging to the lanthanide series of the periodic table. It is silvery-white and soft, displaying properties common to most of the rare-earth elements. Thulium can be isolated from other rare earths through ion-exchange reactions. While thulium is not as abundant or widely used as other rare earths, it has several niche applications. One of its artificially-produced isotopes, Tm-170, is employed as a radiation source in portable X-ray devices. Additionally, thulium lasers, specifically Tm:YAG lasers, have applications in medical procedures, industrial drilling, and research.

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