Undoped Yttrium Aluminum Garnet (Y3Al5O12, YAG) Single Crystal Substrates

  • $ 13900

Undoped YAG is a substrate and window material for both IR and UV optics.  Undoped YAG is highly transmissive in the IR region where glasses tend to absorb.  YAG is much easier to polish to optical specifications but retains the chemical robustness near that of Sapphire.  YAG is a non-birefringent material. 

Main Parameters of undoped YAG single crystal substrates


Undoped-Yttrium Aluminum Garnet, Y3Al5O12

Crystal structure

Cubic, Ia-3d (m3m)

Unit cell constant

a = 10.503 A

Melt point (ºC)


Density (g/cm3)



8.5 Mohs

Thermal expansion (x 10-6 K-1 )

8.2 (100), 7.7 (110), 7.8 (111)

Thermal Conductivity (W m-1 K-1)


Refractive Index @1.064 µm


Dielectric Constant



5x5, 10x5, 10x10, 25.4x25.4, 50.8x50.8 mm

1 inch diameter, 2 inch diameter, other sizes are available upon request


0.5 mm or 1.0 mm or customized

Surface polishing

Single or double side polished (epi-ready CMP)

Crystal orientation

(100), (110), (111), +/- 0.5 degree

Surface roughness, Ra:

< 0.5 nm (5 um x 5 um area)


sealed in class 100 clean bags packed in class 1000 clean room



C.R. Varney, S.M. Reda, D.T. Mackay, M.C. Rowe, and F.A. Selim. Strong visible and near infrared luminescence in undoped YAG single crystals AIP Advances 1, 042170 (2011)

R.W. Stites and K.M. Ohara The Verdet constant of undoped Y3AL5O12 in the near infrared. Optics Comm. Vol 285(20), 2012, Pg. 3997-4000.

C.R. Varney, S.M. Reda, D.T. Mackay, M.C. Rowe, and F.A. Selim. On the Optical Properties of Undoped and Rare-Earth-Doped Yttrium Aluminum Garnet Single Crystals Journal of Physics D Applied Physics 45(1), 2012