Applications
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 |
Index of Refraction
at 0.8 mm
at 0.9 mm
at 1.0 mm
at 1.2 mm
at 1.4 mm |
1.8245
1.8222
1.8197
1.8152
1.8121 |
|
SYNOPTICS
