Undoped YAG (Yttrium Aluminum Garnet)

undoped yag

Applications
undoped YAG chart

undoped YAG datasheet


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Alternative to Sapphire as an optical material​
Advantages
Very low absorption in the 2-3 micron range​     ​
Much easier to polish than Sapphire
Does not exhibit birefringence like Sapphire​
Extremely durable
Ordering Options and Specifications
​      AR Coating Reflectivity: ​<0.25% at specified l
​​Wavefront Distortion: < l/2
Diameter Tolerance:
​+0.000" / -0.002"
Length Tolerance:
+0.040" / -0.000"
Flatness​: < l/10 at 633nm
Surface Quality
(per MIL-O-13830A):
10-5
Damage Threshold​: >15 J/cm2
Material Properties
Formula: ​Y3Al5O12
​​Crystal Structure: Cubic [111]
Moh Hardness:
​8-8.5
Melting Point:
1950°C
Density:
4.55 g/cm3
Thermal Conductivity: 0.14 W/ cm°C
dn/dt:
7.4 x 10-6 o C-1
Thermal Expansion:
6.9 x 10-6 o C-1