Gallium Lanthanum Sulphide GLS

Gallium Lanthanum Sulphide (GLS) SDS
Gallium Lanthanum Sulphide (GLS) Data Sheet

Gallium Lanthanum Sulphide is a radically new chalcogenide glass and a much awaited alternative to toxic Arsenic-based glasses, with an optical transparency from the visible to infrared wavelengths, and thermal stability up to 550oC. In addition, GLS can be melted in a large scale without the need for sealed ampoule processing making GLS production and processing safer and more economical. Equally important, impurity levels, in particular, OH- and SH- absorption bands at around 3 and 4 ìm have been substantially reduced thus increasing performance.

GLS has found use in a wide range of optoelectronic applications and is available as polished optical components, thin and thick films and in optical fibre form.

Transmission Range
0.5 to 10 μm
Refractive Index
2.398 at 1.014 μm
Reflection Loss
29% at 1.014 μm (2 surfaces)
Absorption Coefficient
<0.005 cm-1
Reststrahlen Peak
+75 x 10-6/°C
dn/dμ = 0
4 μm
4.04 g/cc
Melting Point
Thermal Conductivity
0.43 W m-1 K-1 @ 273 K
Thermal Expansion
10 x 10-6/°C @ 273 K
Knoop 206 with 200g indenter
Specific Heat Capacity
540 J Kg-1 K-1
Dielectric Constant
8.1 at 1 MHz
Youngs Modulus (E)
59 GPa
Shear Modulus (G)
23 GPa
Bulk Modulus (K)
24.5 GPa
Elastic Coefficients
Apparent Elastic Limit
Poisson Ratio
Negligible in water
Molecular Weight
Amorphous Glass


µm No
0.5461 2.522
0.5790 2.500
0.6439 2.467
µm No
0.6678 2.458
0.7065 2.466
1.0140 2.398
µm No
1.3673 2.379
1.7101 2.371

Gallium Lanthanum Sulphide (GLS) glass is produced by proprietary processes under conditions of the highest purity. Particular effort is made in removing transition metal impurities to a level of better than 1 ppm total metallic impurities with SH- and OH- less than 1 ppm. GLS is routinely processed from ingots of 500 grams. Other glass compositions are available including rare earth doped (Ce, Pr, Nd, Tb, Dy, Ho, Er, Tm, Yb), halide (F, Cl), and Ag doped samples.

Damage Threshold >200MW/cm2 at 1550nm

Acousto-optic Figure of Merit: M2 = 6 x 10-15

Verdet Constant = 0.205 min/Oe/cm

Petrovich, Hewak et al Journal of Non-Crystalline Solids 326&327 (2003) 93–97

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