Er:YAG Laser Crystal
Erbium-doped yttrium aluminum garnet(Er:YAG) combine various output wavelength with the superior thermal and optical properties of YAG. It’s an excellent laser crystal which lasers at 2.94um highly surface cutting laser. It is a well known material for medical applications.
Advantages
1 ) Very high slope efficiency
2 ) Operates well at room temperature
3 ) Operate in a relatively eye-safe wavelength range
Specifications
Material | Er:YAG |
Dopant concentration | Er: ~50 at% |
Orientation | <111> |
Dimensions | Diameter:2mm-50mm, Length:5mm-180mm(Upon customer’s request) |
Diameter tolerance | +0/-0.04mm |
Length tolerance | +0.5/-0mm |
Chamfer | 0.1mm@45° |
Extinction Ratio | >25dB(depends on actual size) |
Flatness | <λ/10@632.8nm |
Barrel Finish | Ground Finish 400#Grit |
Surface Quality | 10-5 @MIL-0-13830A |
Chips | <0.1mm |
Perpendicularity | <5 arc minutes |
Parallelism | <10 arc seconds |
Wavefront Distortion | λ/8 per inch @632.8nm |
Damage Threshold | >500MW/cm2 |
Anti-Reflection coating | R<0.20%@2940nm per surface |
Properties
Chemical Formula | Er3+:Y3Al5O12 |
Laser Transition | 4I11/2 to 4I13/2 |
Photon Energy | 6.75×10-20J@2940nm |
Laser Wavelength | 2940nm |
Emission Cross Section | 3×10-20 cm2 |
Index of Refraction | 1.79@2940nm |
Pump Bands | 600~800nm |
Moh Hardness | 8.25 |
Melting Point | 1965℃ |
Thermal Conductivity | 11.2W/m/K |
Thermal shock Resistance | 790W/m |