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Er:YAG is an excellent laser crystal which lases at 2.94 μm. This wavelength is the most readily absorbed into water and hydroxylapatite 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.
Er:YAG Crystal Features:
- High slope efficiency
- Operate well at room temperature
- Operate in a relatively eye-safe wavelength range
Er:YAG Crystal Physical Properties:
|
Crystal Structure |
Cubic |
|
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 x 104 Kg/mm2 |
|
Poisson Ratio |
0.3(est.) |
|
Tensile Strength |
0.13~0.26GPa |
|
Thermal Expansion Coefficient |
[100]Direction:8.2x10-6 / °C (0~250 °C ) [110]Direction:7.7x10-6 / °C (0~250 °C ) [111]Direction:7.8x10-6 / °C (0~250 °C ) |
|
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 |
Er: YAG Crystal Optical Properties:
|
Laser Transition |
4I11/2 - 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 |
|
Sellemeier equation (λ in um) |
n2=2.08745+1.2081λ2/(λ2-0.02119)+17.2049λ2/(λ2-1404.45) |
Er:YAG Standard Product Specifications:
|
Dopant concentration |
Er: ~50 at% |
|
Orientation |
<111> or <100> crystalline within 5° |
|
Wavefront distortion |
λ /8 @ 633 nm |
|
Extinction Ratio |
>25dB |
|
Rod Sizes |
Diameter:3～6mm, Length:50～120 mm |
|
Dimension Tolerances |
Diameter: ±0.025 mm, Length: ±0.5 mm |
|
Surface quality |
10/5 Scratch / Dig per MIL-O-1380A |
|
Parallelism |
< 10 arc seconds |
|
Perpendicularity |
< 5 arc minutes |
|
Flatness |
< λ /10 @ 633 nm |
|
Chamfer |
<0.1 mm @ 45deg. |
|
Barrel Finish |
Ground Finish: 400# Grit |
|
AR Coating |
< 0.25% @ 2940nm |