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Er: YAG Crystal

Er:YAG Crystal Er:YAG is an excellent laser crystal which lases at 2.94 μm. This wavelength is the most readily absorbed into water and hydroxylapatite of all existing wavelengths and is considered a highly surface cutting laser. It has wide applications in medical applications, such as dental(hard tissues), orthopedics,etc.


Er:YAG Crystal Features:

- High slope efficiency

- Operate well at room temperature

- Operate in a relatively eye-safe wavelength range


Er:YAG Crystal Physical Properties:


 Crystal Structure

 Cubic

 Lattice Parameters

 12.01 Å

 Melting Point

 1970 °C

 Moh Hardness

 8.5

 Density

 4.56±0.04g/cm3

 Specific Heat (0-20)

 0.59J/g.cm3

 Modulus of Elasticity

 310GPa

 Young's Modulus

 3.17 x 104 Kg/mm2

 Poisson Ratio

 0.3(est.)

 Tensile Strength

 0.13~0.26GPa

 Thermal Expansion Coefficient

 [100]Direction:8.2x10-6 / °C (0~250 °C )

 [110]Direction:7.7x10-6 / °C (0~250 °C )

 [111]Direction:7.8x10-6 / °C (0~250 °C )

 Thermal Conductivity

 14W/m/K(@20 °C )

 10.5W/m/K(@100 °C )

 Thermal Optical Coefficient (dn/dT)

 7.3×10-6 / °C

 Thermal Shock Resistance

 790W/m


Er: YAG Crystal Optical Properties:

 

 Laser Transition

 4I11/2 - 4I13/2

 Laser Wavelength

 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

 Sellemeier equation (λ in um)

 n2=2.08745+1.2081λ2/(λ2-0.02119)+17.2049λ2/(λ2-1404.45)

 

Er:YAG Standard Product Specifications:


 Dopant concentration

 Er: ~50 at%

 Orientation

 <111> or <100> crystalline within 5°

 Wavefront distortion

 λ /8 @ 633 nm

 Extinction Ratio

 >25dB

 Rod Sizes

 Diameter:36mm, Length:50120 mm

 Dimension Tolerances

 Diameter: ±0.025 mm, Length: ±0.5 mm

 Surface quality

 10/5 Scratch / Dig per MIL-O-1380A

 Parallelism

 < 10 arc seconds

 Perpendicularity

 < 5 arc minutes

 Flatness

 < λ /10 @ 633 nm

 Chamfer

 <0.1 mm @ 45deg.

 Barrel Finish

 Ground Finish: 400# Grit

 AR Coating

 < 0.25% @ 2940nm