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 CASIX.
Main Features:
l
Transmission in 0. 25 - 5.0 mm, no absorption in 2 - 3 mm.Basic Properties:
Crystal Structure |
Cubic |
Density |
4.5 g/cm3 |
Transmission Range |
250 - 5000 nm |
Melting Point |
1970 oC |
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 @ 0.8µm, 1.8197 @ 1.0µm, 1.8121 @ 1.4 mm |
Main Specifications of YAG Windows and Mirrors:
Orientation |
[111] within 5 o |
Diameter |
+/-0.1 mm |
Thickness |
+/-0.2 mm |
Flatness |
better than l/8 @ 633 nm |
Parallelism |
better than 30" |
Perpendicularity |
better than 5' |
Scratch-Dig |
10-5 per MIL-O-13830A |
Wavefront Distortion |
better than l/2 per inch @ 1064 nm |
Other high-precision windows, AR- and HR-coatings are available upon request.
opyright 1998 CASIX, Inc. All rights reserved.
Last Revised: May 19, 1999
Web Page maintained by : Contact@CASIX.com
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