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Er: YAG erbium-doped yttrium aluminum garnet is an excellent crystal emitting 2.94μm wavelength laser, suitable for room temperature work, and widely used in laser medical and other fields. It has high slope efficiency, and the laser working wavelength is relatively safe for human eyes.
Main Feature
high slope efficiency
work at room temperature
Laser operating wavelength is relatively safe for human eyes
Material Properties
| Crystal structure | Cubic system |
| Lattice constant | 12.01 Å |
| Melting point | 1970°C |
| Moh's hardness | 8.5 |
| Density | 4.56±0.04g/ cm3 |
| Specific heat | 0.59J /g.cm3 |
| Elastic Modulus | 310GPa |
| Young's modulus | 3.17×10 4 Kg/mm 2 |
| Poisson's ratio | 0.3 |
| Tensile strength | 0.13~0.26GPa |
| Coefficient of thermal expansion | [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 | 790W/m |
| Solubility | Insoluble in water, slightly soluble in common acids |
Product Parameters
| Doping concentration | 50at% |
| Orientation | <111>±5° |
| Wavefront distortion | ≤0.125λ per inch@632.8nm |
| Extinction Ratio | ≥25dB |
| Product Size | Ø≤15mm, L≤150mm |
| Dimensional tolerance | Ø:0/-0.05mm,L:0/+0.5mm |
| Cylindrical processing | Grinding, polishing, threading |
| Parallelism of end faces | ≤10" |
| Perpendicularity between end face and rod axis | ≤5′ |
| Flatness of end face | λ/10 @632.8nm |
| Surface Quality | 10/5 (MIL-O-13830A) |
| Chamfer | 0.15±0.05mm |
| Coating | S1/S2: R≤0.25% @2940nm |
| S1: PR＝88%±3% @2940nm; S2: HR≥99.8% @2940nm | |
| Other films can be customized | |
| Coating anti-laser damage threshold | ≥5J/cm2, 10ns, 10Hz |
| Laser wavelength | |
| Refractive index | 1.79 @2940nm |
| Special requirements | Wedge angle, concave/convex, hot layer gold plating, etc. |
