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Er:YAG is an excellent laser crystal
which lasers at 2.94mm. It has
wide applications in medical laser systems and others.
Advantages of Er:YAG Crystals:
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Main Specifications
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| Dopant concentration |
Er: ~50 at% |
| Orientation |
[111] within 5° |
| Wavefront Distortion |
≤0.125λ/inch(@1064nm) |
| Extinction Ratio |
≥25 dB |
| Rod Sizes |
Diameter: 3～6mm, Length:50～120
mm
Upon request of customer |
| Dimensional Tolerances |
Diameter:+0.000"/-0.002",
Length: ± 0.02" |
| Barrel Finish |
Ground Finish: 400# Grit |
| Parallelism |
≤10" |
| Perpendicularity |
≤5′ |
| Flatness |
λ/10 |
| Surface Quality |
10-5(MIL-O-13830A) |
| Chamfer |
0.006"±0.002" at 45°± 5° |
| AR Coating Reflectivity |
≤ 0.25% (@2940nm) |
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Optical and Spectral
Properties
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| Laser Transition |
4I11/2
to 4I13/2 |
| Laser Wavelength |
2940nm |
| Photon Energy |
6.75×10-20J(@2940nm) |
| Emission Cross
Section |
3×10-20 cm2 |
| Index of Refraction |
1.79 @2940nm |
| Pump Bands |
600~800 nm |
| Physical and
Optical properties |
| Lattice Parameters |
12.01 Å |
| Melting Point |
1970°C |
| Moh Hardness |
8.5 |
| Density |
4.56 ± 0.04g/cm3 |
| Specific Heat (0-20) |
0.59J/g.cm3 |
| Modulus of Elasticity |
310GPa |
| Young's Modulus |
3.17×104Kg/mm2 |
| Poisson Ratio |
0.3(est.) |
| Tensile Strength |
0.13~0.26GPa |
| Thermal
Expansion Coefficient |
[100] Direction:8.2×10-6/ |
| [110] Direction:7.7×10-6/ |
| [111] Direction:7.8×10-6/ |
| Thermal
Conductivity |
14W/m/K(@20°C) |
| 10.5W/m/K(@100°C) |
| Thermal Optical Coefficient
(dn/dT) |
7.3×10-6/°C |
| Thermal Shock Resistance |
790W/m |
| Solubility |
Water: Insoluble;
Common Acids: Slightly |
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