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Er: YAG is a kind of excellent 2.94 um laser crystal, widely used in laser medical system and other fields. Er: YAG crystal laser is the most important material of 3nm laser, and the slope with high efficiency, can work at room temperature laser, laser wavelength is within the scope of the human eye safety band, etc. 2.94 mm Er: YAG laser has been widely used in medical field surgery, skin beauty, dental treatment.

Advantages of Er:YAG Crystals

● High slope efficiency

● Operate well at room temperature

● Operate in a relatively eye-safe wavelength range

Basic Properties
Coefficient of Thermal Expansion	6.14 x 10-6 K-1
Crystal Structure	Cubic
Thermal Diffusivity	0.041 cm2 s-2
Thermal Conductivity	11.2 W m-1 K-1
Specific Heat (Cp)	0.59 J g-1 K-1
Thermal Shock Resistant	800 W m-1
Refractive Index @ 632.8 nm	1.83
dn/dT (Thermal Coefficient of Refractive Index) @ 1064nm	7.8 10-6 K-1
Molecular Weight	593.7 g mol-1
Melting Point	1965°C
Density	4.56 g cm-3
MOHS Hardness	8.25
Young’s Modulus	335 Gpa
Tensile Strength	2 Gpa
Lattice Constant	a=12.013 ?
Technical Parameters
Dopant concentration	Er: ~50 at%
Orientation	[111] within 5°
Wavefront Distortion	≤0.125λ/inch(@1064nm)
Extinction Ratio	≥25 dB
Rod Sizes	Diameter:3～6mm, Length:50～120 mm
Rod Sizes	Upon request of customer
Dimensional Tolerances	Diameter:+0.00/-0.05mm,
Dimensional Tolerances	Length: ± 0.5mm
Barrel Finish	Ground Finish with 400# Grit or polished
Parallelism	≤10"
Perpendicularity	≤5′
Flatness	λ/10 @632.8nm
Surface Quality	10-5(MIL-O-13830A)
Chamfer	0.15±0.05mm
AR Coating Reflectivity	≤ 0.25% (@2940nm)
Optical and spectral Properties
Laser Transition	4I11/2 to 4I13/2
Laser Wavelengtha	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
Laser Transition	4I11/2 to 4I13/2

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