Yttrium Aluminium Garnet YAG
DownloadYAG (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 sa
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 (2 surfaces)
Absorption Coefficient
n/a
Reststrahlen Peak
n/a
dn/dT
+9.1 x 10-6 K-1 @ 1.06μm (2)
dn/dμ = 0
n/a
Density
4.56 g/cc
Melting Point
1940°C
Thermal Conductivity
12.9 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
0.28
Solubility
Insoluble in water
Molecular Weight
593.52
Class/Structure
Cubic Garnet, m3m
| 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 |
| µm | No |
|---|---|
| 1.030 | 1.8173 |
| 1.064 | 1.8169 |
| 1.333 | 1.8146 |
| 1.444 | 1.8140 |
| 1.500 | 1.8137 |
| 1.640 | 1.8132 |
| µm | No |
|---|---|
| 2.014 | 1.8123 |
| 2.097 | 1.8121 |
| 2.123 | 1.8113 |
| 2.940 | 1.8113 |
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