Yttrium Aluminium Garnet (YAG)

YAG (Yttrium aluminium oxide Y3Al5O12) is an active laser crystal when dopants such as Nd, Tm, Er, and Cr are used. Being cubic there is no double refraction and it is sometimes used for a window material substituting for sapphire.
 
Product Data -----------------------------------------------------
 
Transmission Range : 0.21 to 5.5 μm
Refractive Index : 1.81523 at 1.06 μm (1)
Reflection Loss : 16.7% at 1.06 μm
Absorption Coefficient : n/a
Reststrahlen Peak : n/a
dn/dT : +9.1 x 10-6 K-1 at 1064nm (2)
dn/dμ = 0 : n/a
Density : 4.56 g/cc
Melting Point : 1940 °C
Thermal Conductivity : 14 W m-1 K-1
Thermal Expansion : 7.8 (111), 7.7 (110), 8.2 x 10-6 K-1 (100)
Hardness : Knoop 1215
Specific Heat Capacity : 590 J Kg-1 K-1
Dielectric Constant : 11.7
Youngs Modulus (E) : 300 GPa
Shear Modulus (G) : n/a
Bulk Modulus (K) : n/a
Elastic Coefficients : C11=333; C12=111; C44=115
Apparent Elastic Limit : 280 MPa
Poisson Ratio : n/a
Solubility : Insoluble in water
Molecular Weight : 593.62
Class/Structure : Cubic, m3m
 
Refractive Index and Optical Transmittance curve----
Refractive Index(No=Ordinary Ray):
µm    No µm    No µm    No
0.266    1.9278 0.354    1.8725 0.532    1.8368
0.800    1.8245 0.808    1.8217 0.946    1.8186
1.030    1.8173 1.064    1.8169 1.333    1.8146
1.444    1.8140 1.500    1.8137 1.640    1.8132
2.014    1.8123 2.097    1.8121 2.123    1.8121
2.940    1.8113
Optical Transmittance Curve of YAG (Reference Data):
yttrium-aluminium-garnet-yag Transmittance
 
Special properties of YAG-----------------------------------

Typeical application:Thermal imaging, FLIR.

Products manufactured:Lenses, Aspheric Lenses, Rods, Windows, Optical Beamsplitters, Optical Filters, Wedges.

Surface finish:Typical specifications for surface quality in the infrared are a 10-50 scratch dig in the 1.2 to 3μm spectral region and 60-40 scratch-dig for the 3-7μm area. Diamond Turned surface finishes of 120Angstroms rms or better are typical.

Surface figure:In the infrared, typical required surface figure ranges from 1/2 wave to 2 waves @0.6328μm and are usually specified depending on the system performance requirements.

AR coating options:In the infrared, typical required surface figure ranges from 1/2 wave to 2 waves @0.6328μm and are usually specified depending on the system performance requirements.

Product Notes:------------ --------------------------------------

YAG crystal is produced by the Czochralski growth process up to approximately 100mm diameter.

REFERENCES:
(1) Handbook of Optical Constants, ed Palik, V3, ISBN 0-12-544423-0
(2) Wilson, Thermo-Optic Coefficients. PhD dissertation. U Southern Calif. Jan 1980

Data provided is extracted from our technical handbook of materials. While every attempt has been made to verify the source of the information, ultiQuest Technology accept no responsibility for accuracy of data

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