Pure YAG
Yttrium aluminum garnet (YAG) crystals belong to the cubic crystal system, are isotropic, and have excellent optical and thermodynamic properties. Their mechanical properties and chemical stability are close to those of sapphire, without sapphire's birefringence. Pure YAG crystals have high transmittance in the 0.25~5um region and no absorption at 2-3um, whereas glass has a strong H₂O absorption band in this region. Undoped pure YAG is therefore a new substrate and window material for ultraviolet and infrared optical equipment. Its excellent physical, chemical, and optical properties also make YAG an important optical crystal material for high-temperature and high-energy physics environments.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Crystal Orientation | [111] or [100], deviation within 5℃ |
| Dimensions | Provided to Customer Requirements |
| Wavefront Distortion | ≤0.125λ/25mm |
| Dimensional Tolerance | Diameter ：&pλusmn;0.05mm； Thickness ：&pλusmn;0.1mm |
| Cylindrical Processing | Fine ground or polished |
| End-Face Parallelism | ≤20² |
| End-Face Flatness | λ/10 |
| Surface Quality | 10-5(MIL-O-13830A) |
| Antireflection Coating Reflectance | ≤0.2%@specified wavelength |
| Optical Characteristics - Refractive Index | 1.8197@1064mm |
| Transmission Wavelength Range | 250-5000nm |
| Optical Damage Threshold | ≥15Jcm⁻²@1064nm |
| Crystal Structure | Cubic crystal system |
| Lattice Constant | 12.01Å |
| Melting Point | 1970℃ |
| Mohs Hardness | 8.5 |
| Specific Heat | 0.59J/g•cm⁻³@0-20℃ |
| Elastic Modulus | 310GPa |
| Young's Modulus | 3.17x10⁴kg/mm² |
| Poisson's Ratio | 0.3 |
| Tensile Strength | 0.13-0.26GPa |
| Thermal Expansion Coefficient | [111] Direction :7.8x10⁻⁶/℃@0-250℃; [110] Direction :7.7x10⁻⁶/℃@0-250℃; [100] Direction :8.2x10⁻⁶/℃@0-250℃ |
| Thermal Conductivity | 14W/m/K@20℃; 10.5W/m/K@100℃ |
| Thermo-Optic Coefficient | dn/dt = 7.3x10⁻⁶/℃ |
| Thermal Shock Resistance | 800W/m |
| Solubility | Insoluble in water, slightly soluble in acids |
Datasheet
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