Er:YAG
Er:YAG crystal is an excellent laser crystal which lasers at 2.94μm. This wavelength is the most readily absorbed into water and hydroxylapatite of all existing wavelengths and is considered a highly surface cutting laser. It is a well known material for medical applications.
Advantages:
1. High slope efficiency
2. Operate well at room temperature
3. Operate in a relatively eye-safe wavelength range
Specifications
| Dopant concentration | Up to 50 at% |
| Orientation | [100] within 5° |
| Wavefront Distortion | ≤0.125λ/inch(@1064nm) |
| Optical Quality | Interference fringes ≤ 0. 125 /inch Extinction ration Ø3~Ø6.35 ≥ 28Db, Ø7~Ø10 ≥ 25dB |
| Size | Rods: Ø (3~10)mm×(30~180)mm (L) Slabs: (3~12)mm×(6~24)mm×(60~180)mm (L) Upon request of customer |
| Dimensional tolerances | Diameter: +0/-0.05mm Length: ±0.5mm , Chamfer : <0.1 mm @ 45º |
| Parallelism | ≤10" |
| Perpendicularity | ≤5′ |
| Flatness | λ/10 @632.8nm |
| Surface Quality | 10-5(MIL-O-13830A) |
| AR Coating Reflectivity | ≤ 0.25% (@2940nm) |
Main Properties of Er:YAG crystal:
| Crystal Structure | Cubic |
| Lattice Parameters | 12.01 Å |
| Melting Point | 1970℃ |
| Moh Hardness | 8.5 |
| Density | 4.56±0.04g/cm3 |
| Specific Heat (0-20) | 0.59J/g.cm3 |
| Thermal Expansion Coefficient | [100]Direction:8.2×10-6/℃(0~250℃) |
| Thermal Conductivity | 14W/m/K(@20℃) |
| 10.5W/m/K(@100℃) | |
| Laser Transition | 4I11/2 to 4I13/2 |
| Laser Wavelength | 2940nm |
| Emission Cross Section | 3×10-20 cm2 |
| Index of Refraction | 1.79 @2940nm |
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