Er:YAG


Wavelength                       2940nm            

Melting point                     1965°C

Orientation                        [111] within 5°

Density                              4.56 g cm-3

Parallelism                  ≤ 10"

Perpendicularity          ≤ 5′

Flatness                            λ/10 @632.8nm

Surface quality                  10-5

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 Å

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
Upon request of customer

Dimensional Tolerances

Diameter:+0.00/-0.05mm, 
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 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

Laser Transition

4I11/2 to 4I13/2

Customized

You can customise this product to your needs. If you do not find suitable specifications for your application please contact us for custom solution.