Undoped Yttrium Aluminum Garnet (Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>, 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. Main Parameters of undoped YAG single crystal substrates Material Undoped-Yttrium Aluminum Garnet, Y3Al5O12 Crystal structure Cubic, Ia-3d (m3m) Unit cell constant a = 10.503 A Melt point (ºC) 1940 Density (g/cm3) 4.56 Hardness 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) 14 Refractive Index @1.064 µm 1.8152 Dielectric Constant 11.7 Sizes 5x5, 10x5, 10x10, 25.4x25.4, 50.8x50.8 mm 1 inch diameter, 2 inch diameter, other sizes are available upon request Thickness 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) 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 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

Undoped Yttrium Aluminum Garnet (Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>, 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. 

Main Parameters of undoped YAG single crystal substrates

Material

Undoped-Yttrium Aluminum Garnet, Y3Al5O12

Crystal structure

Cubic, Ia-3d (m3m)

Unit cell constant

a = 10.503 A

Melt point (ºC)

1940

Density (g/cm3)

4.56

Hardness

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)

14

Refractive Index @1.064 µm

1.8152

Dielectric Constant

11.7

Sizes

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

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

Thickness

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)

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

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

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