Refractive index database

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Optical constants of LiGaS2 (Lithium gallium sulfide, LGS)
Kato et al. 2017: n(β) 1.025–10.591 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]



nβ; room temperature.


K. Kato, K. Miyata, L. Isaenko, S. Lobanov, V. Vedenyapin, V. Petrov. Phase-matching properties of LiGaS2 in the 1.025–10.5910 μm spectral range, Opt. Lett., 42, 4363–4366 (2017)


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


Lithium gallium sulfide, LiGaS2 (LGS)

Lithium gallium sulfide (LiGaS2, abbreviated as LGS) is a nonlinear optical crystal material often employed in frequency conversion applications, including second harmonic generation and optical parametric oscillation. Its broad transparency range in the infrared spectrum and high nonlinearity make it suitable for laser systems and other photonics applications. Like other nonlinear optical materials, LGS needs to be phase-matched for effective frequency conversion, and its optical properties can vary with temperature and orientation. Special care must be taken in handling and storing the crystal to prevent degradation of its optical qualities.