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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 Dream Lasers.
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Main Features:
l Transmission in 0. 25 - 5.0mm, no absorption in 2 - 3mm.
l Extremely hard and durable
l High thermal conductivity
l High bulk damage threshold
l High index of refraction and Non-birefringence
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Basic Properties:
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| Crystal Structure |
Cubic |
| Density |
4.5 g/cm3 |
| Transmission Range |
250 - 5000 nm |
| Melting Point |
1970 oC |
| Specific Heat |
0.59 W · s · g-1 · K-1 |
| Thermal Conductivity |
14 W·m-1·K-1 |
| Thermal Shock Resistance |
790 W /m |
| Thermal Expansion |
6.9x10-6 /K |
| dn/dT, @ 633nm |
7.4x10-6 /K-1 |
| Mohs Hardness |
8 ~ 8.5 |
| Refractive Index |
1.8245 @ 0.8mm, 1.8197 @ 1.0mm, 1.8121 @ 1.4mm |
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Main Specifications of YAG Windows and Mirrors:
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| Orientation |
[111] within 5o |
| Diameter |
+/-0.1 mm |
| Thickness |
+/-0.2 mm |
| Flatness |
better than λ/8 @ 633 nm |
| Parallelism |
better than 30" |
| Perpendicularity |
better than 5' |
| Scratch-Dig |
10-5 per MIL-O-13830A |
| Wavefront Distortion |
better than λ/2 per inch @ 1064 nm |
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Other high-precision windows, AR- and HR-coatings are available upon request.
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