Er:YAG is an excellent laser crystal which lases at 2.94μm, This wavelength is the most readily absorbed into water and hydroxyapatite of all existing wavelengths and is considered a highly surface cutting laser.
It has wide applications in medical applications, such as dental (hard tissues), orthopedics, etc.
Advantages
High slope efficiency
Operate well at room temperature
Operate in a relatively eye-safe wavelength range
Properties
|
Crystal Structure |
Cubic |
|
Lattice Parameters |
12.01Å |
|
Orientation |
<100> within 5° |
|
Melting Point |
1970℃ |
|
Moh Hardness |
8.5 |
|
Density |
4.56g/cm3 |
|
Specific Heat (0-20) |
0.59J/g.cm3 |
|
Thermal Expansion Coefficient |
[100]Direction:8.2×10-6/℃(0~250℃) |
|
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 |
Specifications
|
Dopant concentration |
Er: ~50 at% |
|
Diameter Tolerance |
+0/-0.05mm |
|
Length Tolerance |
+0.5/-0mm |
|
Surface Flatness |
|
|
Wavefront Distortion |
|
|
Surface Quality |
10/5 Scratch/Dig |
|
Clear Aperture |
>95% |
|
Parallelism |
<10 arc seconds |
|
Perpendicularity |
<5 arc minutes |
|
Chamfer |
0.1mm@45° |
|
Extinction Ratio |
>25dB |
|
AR Coating |
R≤ 0.25% (@2940nm) |
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