Undoped YAG Crystal
Undoped YAG Crystal is an excellent material for UV-IR
optical windows, particularly for high temperature and high energy
density applications, The mechanical and chemical stability is comparable
to sapphire crystal, but YAG is unique with non-birefringence and
available with higher optical homogeneity and surface quality. Up
to 3'' YAG boule grown by CZ method, as-cut blocks, windows and mirrors
are available from Dayoptics.
Main Features:
1) Transmission in 0.25-5.0 m m, no absorption in 2-3 m m.
2) Extremely hard and durable.
3) High thermal conductivity.
4) High bulk damage threshold.
5) High index of refraction and Non-birefringence.
| Basic Properties |
| Crystal structure |
Cubic |
| Density |
4.5g/cm 3 |
| Transmission Range |
250-5000nm |
| Melting Point |
1970°C |
| Specific Heat |
0.59 W.s/g/K |
| Thermal Conductivity |
14 W/m/K |
| Thermal Shock Resistance |
790 W/m |
| Thermal Expansion |
6.9x10 -6 /K |
| dn/dt, @633nm |
7.3x10 -6 /K -1 |
| Mohs Hardness |
8.5 |
| Refractive Index |
1.8245 @0.8 m m, 1.8197 @1.0 m m, 1.8121 @1.4
m m |
Main Specifications of YAG
Windows and Mirrors:
|
| Orientation |
[111] within 5° |
| Diameter |
+/-0.1mm |
| Thickness |
+/-0.2mm |
| Flatness |
better than l /8@633nm |
| Parallelism |
better than 30'' |
| Perpendicularity |
better than 5' |
| Scratch-Dig |
10-5 per MIL-O-1383A |
| Wavefront Distortion |
better than l /2 per inch@1064nm |
Other high-precision windows, AR- and HR-coatings
are available upon request.
