| Dopant Concentration | Er: ~50 at% | Wavefront Distortion | ≤0.125λ/inch(@1064nm) |
| Extinction Ratio | ≥25 dB | Rod Sizes | Diameter:3~6mm, Length:50~120 mm Upon request of the customer |
| Dimensional Tolerances | Diameter:+0.000"/-0.002"Length: ± 0.02" | Barrel Finish | Fine Ground |
| Parallelism | ≤10" | Perpendicularity | ≤5′ |
| Flatness | λ/10 | Surface Quality | 10/5(MIL-PRF-13830B) |
| AR Coating Reflectivity | ≤ 0.25% (@2940nm) | ||
Physical and Optical Properties:
| Laser Transition | 4I11/2to4I13/2 | Laser Wavelength | 2940nm |
| Photon Energy | 6.75×10-20J(@2940nm) | Emission Cross Section | 3×10-20cm2 |
| Index of Refraction | 1.79 @2940nm | Pump Bands | 600~800 nm |
| Pump Wavelength | 600-800nm | Intrinsic Loss | <0.003cm-1@1064nm |
| Thermal Conductivity | 0.12W/m/K(@20°C) | Thermal Expansion Coefficients | 9.5（10-6/°C@20°C ） |
Erbium-doped yttrium aluminum garnet or Er:YAG crystals is an excellent laser crystal that emits laser light of 2.94 μm, this wavelength holds the distinction of being the most absorbable by water among all existing wavelengths and is considered an efficient surface-cutting laser. The 2.94μm wavelength is an eye-safe wavelength, which renders Er:YAG crystals suitable for medical applications such as dental, orthopedics, etc.
Laser Crystal Comparison Chart:
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