Er：YAG

combine various output wavelength with the superior thermal and optical properties of YAG

Classification:

Detailed introduction

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.

PRODUCT FEATURE

Very high slope efficiency

Operates well at room temperature

Operate in a relatively eye-safe wavelength range

Specifications
Concentration	~50at%
Orientation	<111> or <100>±5°
Dimension	Diameter:2~6mm, Length:30~150mm(Customized available)
Dimension Tolerance	Φ:+0/-0.04mm,L:+0.5/-0mm
Perpendicularity	≤5′
Parallelism	≤10″
Chamfer	0.15±0.05mm
Surface Quality	10/5(MIL-PRF-13830B)
Barrel	Fine Ground, Polishing, Grooving
Flatness	≤λ/10@632.8nm
Wavefront Distortion	≤λ/8 per inch @1064nm
Extinction Ratio	≥25dB
Damage Threshold	>500MW/cm²
Coating	R≤0.20%@2940nm

Optical Properties
Laser Transition	⁴I_3/2→⁴I_11/2
Wavelength	2940nm
Photon Energy	6.75×10^-20J@2940nm
Emission Cross Section	3×10^-20cm2
Main Pump Wavelength Range	600~800nm

Physical and Chemical Properties
Crystal Structure	Tetragonal
Melting Point	1970°C
Density	4.56±0.04g/cm³
Specific Heat	0.59J/g.cm³
Elastic Modulus	310GPa
Young's Modulus	3.17×10⁴Kg/mm²
Mohs Hardness	8.5
Poisson’s Ratio	0.3
Tensile Strength	0.13~0.26GPa
Thermal Expansion Coefficients	<100>Direction:8.2×10^-6/K@0~250°C
	<110>Direction:7.7×10^-6/K@0~250°C
	<111>Direction:7.8×10^-6/K@0~250°C
Thermal Conductivity	14W/m/K@20°C
Thermal Conductivity	10.5W/m/K@100°C
Thermal Optical Coefficient	dn/dT=7.3×10^-6/k
Refractive Index	1.79@2940nm