Cr4+:YAG Chromium-Doped Yttrium Aluminum Garnet
Cr4+:YAG is a laser crystal with excellent saturable absorption properties, widely used primarily as a passive Q-switch material for solid-state lasers such as Nd:YAG.
It combines high thermal stability and exceptional mechanical strength, making it suitable for compact laser systems with high peak power.
It combines high thermal stability and exceptional mechanical strength, making it suitable for compact laser systems with high peak power.
Features
- High chemical stability and reliability
- Long lifespan with excellent thermal conductivity
- High laser damage threshold (>500 MW/cm2)
- Passive Q-switch material suitable for high-power, solid-state, compact lasers
- Easy to handle
Applications
- Passive Q-switch lasers
- High peak power solid-state lasers
- Micromachining lasers
- Medical laser systems
- Military and LIDAR light sources
Physical Specifications
| Property | Specification |
|---|---|
| Crystal Structure | Cubic |
| Lattice Constant | 12.01 Å |
| Melting Point | 1970 ℃ |
| Mohs Hardness | 8.5 |
| Density | 4.56 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 Conductivity | 14 W/m·K @ 20 ℃ 10.5 W/m·K @ 100 ℃ |
| Thermo-optic Coefficient (dn/dT) | 7.3 × 10-16 /K |
| Thermal Shock Resistance | 790 W/m |
| Solubility | Insoluble in water, slightly soluble in common acids |
Optical Specifications
| Item | Specification |
|---|---|
| Element Dimensions | Diameter: 3–12 mm |
| Cross-section: 3×3 – 12×12 mm | |
| Thickness Tolerance | ±0.5 mm |
| Processing Method | 400# Precision Polishing |
| Cylindrical Surface Processing | ≤ 30° |
| End Surface Parallelism | λ/8 @ 632.8 nm |
| Surface Quality | 20-10 (MIL-O-13830B) |
| AR Reflectivity | ≤ 0.25% @ 1064 nm |
| Laser Damage Threshold | ≥ 500 MW/cm2 |