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Er: YAG は2.94 μ m で lases 優れたレーザー結晶である。この波長は、すべての既存の波長の水とハイドロキシアパタイトに最も容易に吸収され、非常に表面切断レーザーと見なされます。歯科 (硬組織)、整形外科などの医療用途に幅広く応用されています。
- 高い斜面の効率
- 室温でよく作動しなさい
- 比較的目に安全な波長範囲で動作
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 |