Unlike other optical glasses with the tendency of absorption owing to strong water molecule bonds, undoped YAG carries no absorption lines in the range of 2-3 μm and can be applied in wide spectral range from 250 to 4000 μm.

High values of durability, thermal conductivity, damage threshold and the absence of birefringence allow undoped YAG to be successfully employed in applications pertaining to aggressive external impact and sensitive to optical distortion, including high temperature utilization and high-power laser usage.
Linear defects deficiency and high material homogeneity of Monocrystal undoped YAG crystals enable to produce polished windows, optical waveguides, prisms and other optical items with clear aperture up to 8".

Benefits :
Thermal conductivity significantly higher than that of most glasses
Exceptionally solid and robust material for the manufacturing of polished items
High refraction index which allows to produce low aberration lenses
High damage threshold
Zero-birefringence

Parameter Value
Orientation [100] or [111]
Formula Y3Al5O12
Melting point 1950 °C
Mohs scale hardness 8-8,5
Density 4,55 g/cm3
Thermal conductivity 0,14 W/ cm°C
dn/dt 7,4 х 10 -6 ° С -1
Thermal expansion 6,9 х 10 -6 ° С -1
Index of refraction
на 0,8 mm 1,8245
на 0,9 mm 1,8222
на 1,0 mm 1,8197
на 1,2 mm 1,8152
на 1,4 mm 1,8121

Damage threshold > 15 J/cm2
Wavefront distortion < l / 2
Diameter tolerance +/- 0,05 mm
Flatness < l/10 at 633 nm
Scratch-dig (per MIL-O-13830A) 10-5