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....Undoped YAG is a substrate and window crystal that can be used for both UV
....and IR optic. It is particularly useful for high temperature and high energy
....applications. The mechanical stability of YAG is similar to Sapphire, but
....YAG is not birefringent and is available with high optical homogeneity.
....
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
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Material and Specifications
| Orientation |
[111] within 5¡ã |
| Wavefront
Distortion |
¡Ü 0.125¦Ë/inch |
| Rod
Sizes |
Diameter2¡«15 mm, Length 3¡«200 mm
Upon request of customer |
| Dimensional
Tolerances |
Diameter:+0.000"/-0.002",
Thickness: 0.04" /-0.00" |
| Barrel
Finish |
Ground Finish: 400# Grit |
| Parallelism |
¡Ü30" |
| Flatness |
¦Ë/10 |
| Surface
Quality |
10-5(MIL-O-13830A) |
| Chamfer |
0.006"¡À0.002" |
| AR
Coating Reflectivity |
¡Ü0.2% (@specified Wavelength)
partial and high refraction coatings are available upon
request |
| Index
of Refraction |
1.8197@1064nm |
| Transmission
Range |
250~5000nm |
| Damage
Threshold |
¡Ý15Jcm-2 |
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Physical and Chemical Properties
| Crystal Structure |
Cubic |
| Lattice Parameters |
12.01 Å |
| Melting Point |
1970¡æ |
| Moh Hardness |
8.5 |
| Density |
4.56¡À0.04g/cm3 |
| Specific Heat (0-20) |
0.59J/g.cm3 |
| Modulus of Elasticity |
310GPa |
| Young's Modulus |
3.17¡Á104Kg/mm2 |
| Poisson Ratio |
0.3(est.) |
| Tensile Strength |
0.13~0.26GPa |
| Thermal
Expansion Coefficient |
[100]Direction:8.2¡Á10-6/¡æ(0~250¡æ) |
| [110]Direction:7.7¡Á10-6/¡æ(0~250¡æ) |
| [111]Direction:7.8¡Á10-6/¡æ(0~250¡æ) |
| Thermal
Conductivity |
14W/m/K(@20¡æ) |
| 10.5W/m/K(@100¡æ) |
| Thermal Optical Coefficient
(dn/dT) |
7.3¡Á10-6/¡æ |
| Thermal Shock Resistance |
790W/m |
| Solubility |
Water: Insoluble;
Common Acids: Slightly |
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