Er:YAG

  • Update:Jun 13, 2017
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Er:YAG Erbium doped Yttrium Aluminum Garnet (Er:Y3Al5O12or Er:YAG) combine various output wavelength with the superior thermal and optical properties of YAG. It is an excellent laser crystal at 2.94m.

Product Introduction

Erbium doped Yttrium Aluminum Garnet (Er:Y3Al5O12or Er:YAG) combine various output wavelength with the superior thermal and optical properties of YAG. It is an excellent laser crystal which lasers at 2.94μm. This wavelength is the most readily absorbed into water and hydroxylapatite of all existing wavelengths and is considered a highly surface cutting laser. It is a well known material for medical applications.  

Material Properties of Er:YAG crystal

Chemical formula Er3+:Y3Al5O12
Crystal structure cubic
Melting point: 1970 °C
Density, g/cm3 5,35
Mohs hardness 8.5
Thermal expansion coefficient 9,5 x 10-6 K-1 (a axis) 4,3 x 10-6 K-1 (b axis) 10,8 x 10-6 K-1 (c axis)
Thermal conductivity at 25°C 0.12 W x cm-1x °K-1
Loss coefficient at 1064 nm 0.003 cm-1

  Laser Properties

Laser Transition 4I11/2to4I13/2
Laser Wavelength 2940nm
Fluorescence Lifetime 90 m s
Photon Energy 6.75×10-20J(@2940nm)
Emission Cross Section 3×10-20cm2
Index of Refraction 1.79 @2940nm
Pump Bands 600~800 nm

 Standard specifications

Dopant concentration, at.% Up to 50
Orientation: <111>within 5°
Flatness < λ/10 measured at 633 nm
Parallelism ≤ 30"
Perpendicularity ≤ 5 ′
Surface Quality 10-5 per scratch-dig MIL-O-13830A
Optical Quality: Interference fringes ≤ 0.125 λ /inch(@1064nm)
Extinction ration ≥ 25dB
Size: Rods:Ф (3-10)mm ×(30-180)mm
Slabs: (3-12)mm ×(6-24)mm ×(60-180)mm
Dimensional tolerances  Diameter:+0.000"/-0.05", Length: ± 0.05"  Chamfer: 0.07+0.005/-0.00" at 45°
AR Coating Reflectivity ≤ 0.2% (@2940nm)

 

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