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er:yag laser

Er: YAG Laser(Erbium-doped YAG)

Er: YAG Laser, Erbium-doped Yttrium Aluminum Garnet (Er: Y3Al5O12 or Er: YAG), combine various output wavelengths with Er: YAG’s superior thermal and optical properties. It is an excellent laser crystal that 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.

Er: YAG laser Crystal — Erbium-doped in YAG, which can stimulate 2940nm laser used in medical and dentistry

The emission wavelength of Er: YAG is 2940nm, which is at the position of the water absorption peak and can be strongly absorbed by water molecules. Therefore, it is widely used in plastic surgery and dentistry.

The projects we have participated in include a laser blood collection instrument, which adopts the structure of both sides of Er: YAG rods coated and xenon lamp end pumped. The Er YAG laser wavelength is an excellent choice for improving a variety of skin conditions and features of aging, including dyschromia, actinic photodamage, solar elastosis, acne, traumatic scarring, fine lines and mild to moderate hydatidosis, coarse skin texture, and skin laxity.


Orientation[100] or [100] <± 0.5
Surface Quality10-5
Wavefront Distortion<­λ/8@632 nm
Surface Flatness<λ/10@632.8nm
Clear Aperture>90%
Thickness/Diameter Tolerance±0.05 mm
Maximum DimensionsDiameter:2mm-50mm, Length:5mm-180mm
Coatings< 0.25% @ 2940 nm
Crystal Structurecubic – la3d
Lattice Constants12.01Å
Density4.56-5.11 g/cm3
Melting Point1950°C
Thermal Conductivity/(W·m-1·K-1@25°C)0.14W
Specific Heat/(J·g-1·K-1)0.59
Thermal Shock Resistance790W/m
Thermal Expansion /(10-6·K-1@25°C )7.8
Hardness (Mohs)8.5
Young`s Modulus /GPa317
Shear Modulus /Gpa54.66
Extinction Ratio/dB30
Barrel FinishGround Finish 400#Grit
Poisson Ratio0.25
Laser Transition4I11/24I13/2 (highly doped); 4I13/2 4I15/2 (low doped)
Laser Wavelength2940 nm (highly doped); 1645 nm (low doped)
Photon Energy6.75×10-20J@2940nm
Pump Absorption Band Width600~800 nm (highly doped); 1530 nm (low doped)
Damage Threshold>500MW/cm2
Emission Cross Section3×10-20 cm2
Fluorescence Lifetime0.23 ms (highly doped); 2~5 ms (low doped)
Refractive Index1.7838@2940 nm

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