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YAG Crystals
Undoped YAG (Y3Al5O12) is a new substrate and window material for both UV and IR optics. It
is particularly useful for high temperature and high-energy applications. YAG shows no trace
absorption in 2-3micron region where glasses tend to be highly absorbent due to the strong
H2O2 band. The mechanical stability of YAG is similar to Sapphire, but .YAG is not
birefringent and is available with high optical homogeneity. Up to 3' YAG boule grown by CZ
method, as-cut blocks, windows and mirrors are available.
Advantages of Undoped YAG Crystals
Non-birefringent
High bulk damage threshold
High index of refraction, facilitating low aberration lens design
High thermal conductivity
Stable mechanical and chemical properties
Low stress and high optical quality
Transmission in 0.25-5.0mm, no absorption in 2-3mm
Material and Specifications
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Orientation |
[111] within 5° |
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Wavefront Distortion |
≤ 0.125λ/inch |
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Rod Sizes |
Diameter2～15 mm, Length 3～200 mm
Upon request of customer |
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Dimensional Tolerances |
Diameter:+0.000"/-0.002", Thickness: 0.04" /-0.00" |
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Barrel Finish |
Ground Finish: 400# Grit |
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Parallelism |
≤30" |
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Flatness |
λ/10 |
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Surface Quality |
10-5(MIL-O-13830A) |
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Chamfer |
0.006"±0.002" |
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AR Coating Reflectivity |
≤0.2% (@specified Wavelength)
partial and high refraction coatings are available upon request |
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Index of Refraction |
1.8197@1064nm |
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Transmission Range |
250~5000nm |
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Damage Threshold |
≥15Jcm-2 | |
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