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Cr4+:YAG
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The Cr4+:YAG crystal is an excellent saturable absorption material. It exhibits strong absorption within the wavelength range of 0.8 - 1.2μm. Moreover, it has advantages such as a high melting point, damage resistance, and good thermal conductivity, and is frequently used as a passive Q-switch for 0.8 - 1.2μm wavelength lasers.
Characteristics of the Cr4+:YAG Crystal
● Long lifespan
● High damage threshold
● High stability
● High reliability
Basic Parameters Values
| Item | Parameter |
| Orientation | <100> ±5° |
| Flatness | <λ/10 |
| Parallelism | ≤30″ |
| Perpendicularity | ≤5′ |
| Surface Finish | 20/10 (MIL - O - 13830A) |
| Laser Wavelength | 950nm - 1100nm |
| Dimensions | Diameter: 3 - 20mm; Length × Width: 3×3 - 20×20mm (customizable according to customer requirements) |
| Dimensional Tolerance | Diameter: +0.000 / -0.05mm; Length: ±0.5mm |
| Chamfer | ≤0.15mm @ 45° |
| Anti - reflection Film | R ≤ 0.2% @ 1064nm |
| Physical and Chemical Properties | Physical and Chemical Properties |
| Crystal Structure | Cubic Crystal System |
| Lattice Constant | 12.01 |
| Melting Point | 1970℃ |
| Mohs Hardness | 8.5 |
| Density | 4.56 ± 0.04 g/cm³ |
| Specific Heat | 0.59 J/g·cm³ @ 0 - 20℃ |
| Elastic Modulus | 310 GPa |
| Young's Modulus | 3.17×10⁴ Kg/mm² |
| Poisson's Ratio | 0.3 |
| Tensile Strength | 0.13 - 0.26 GPa |
| Thermal Expansion Coefficient | [100] direction: 8.2×10⁻⁶ /K @ 0 - 250℃ |
| [110] direction: 7.7×10⁻⁶ /K @ 0 - 250℃ | |
| [111] direction: 7.8×10⁻⁶ /K @ 0 - 250℃ | |
| Thermal Conductivity | 14W/m/K@20℃ |
| 10.5W/m/K@100℃ | |
| Thermo - optic Coefficient | dn/dT = 7.3×10⁻⁶ /K |
| Thermal Shock Resistance | 790 W/m |
| Solubility | Insoluble in water and slightly soluble in common acids. |
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