Undoped Yttrium Aluminum Garnet (Y3Al5O12, YAG) Single Crystal Substrates
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.
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Main Parameters of undoped YAG single crystal substrates |
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Material |
Undoped-Yttrium Aluminum Garnet, Y3Al5O12 |
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Crystal structure |
Cubic, Ia-3d (m3m) |
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Unit cell constant |
a = 10.503 A |
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Melt point (ºC) |
1940 |
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Density (g/cm3) |
4.56 |
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Hardness |
8.5 Mohs |
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Thermal expansion (x 10-6 K-1 ) |
8.2 (100), 7.7 (110), 7.8 (111) |
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Thermal Conductivity (W m-1 K-1) |
14 |
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Refractive Index @1.064 µm |
1.8152 |
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Dielectric Constant |
11.7 |
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Sizes |
5x5, 10x5, 10x10, 25.4x25.4, 50.8x50.8 mm |
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1 inch diameter, 2 inch diameter, other sizes are available upon request |
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Thickness |
0.5 mm or 1.0 mm or customized |
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Surface polishing |
Single or double side polished (epi-ready CMP) |
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Crystal orientation |
(100), (110), (111), +/- 0.5 degree |
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Surface roughness, Ra: |
< 0.5 nm (5 um x 5 um area) |
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Package |
sealed in class 100 clean bags packed in class 1000 clean room |
References:
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); https://doi.org/10.1063/1.3671646
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. https://doi.org/10.1016/j.optcom.2012.06.008
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