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Er:YAG

Er:YAG is an excellent laser crystal which lasers at 2.94µm. It has wide applications in medical laser systems, and others.

Very high slope efficiency

Operates well at room temperature

Operate in a relatively eye-safe wavelength range

 

Basic Properties:

Crystal Structure

Cubic

Lattice Parameters

12.01 Å

Melting Point

1970 °C

Moh Hardness

8.5

Density

4.56±0.04g/cm 3

Specific Heat (0-20)

0.59J/g.cm 3

Modulus of Elasticity

310GPa

Young's Modulus

3.17X10 4 Kg/mm 2

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

The Sellmeier equations (°C in µm for YAG):

n ^2 = 2.08745 + 1.2081 °l ^2 /(°l^ 2 - 0.02119 )+ 17.2049 °l ^2 /(°l ^2 - 1404.45 )

Optical and Spectral Properties

Dopant concentration

Er: ~50 at%

Laser Transition Transition

4 I 11/2 to 4 I 13/2 to 4 I 13/2

Laser Wavelength

2940nm

Photon Energy

6.75×10 -20 J(@2940nm)

Emission Cross Section

3×10 -20 cm 2

Index of Refraction

1.79 @2940nm

Pump Bands

600~800 nm

Er:YAG's Specifications:

Orientation:

<111> or <100]> crystalline within 5°

Wavefront distortion :

l /8 per inch @ 633 nm

Extinction Ratio:

>25dB

Dimension Tolerances

Rods with diameter: ±0.025 mm , Length: ±0.5 mm

Surface quality:

10/5 Scratch / Digper MIL-O-1380A

Parallelism:

< 10 arc seconds

Perpendicularity:

< 5 arc minutes

Flatness:

< l /10 @ 633 nm

chamfer:

<0.1 mm @ 45deg.

Barrel Finish:

50-80 micro-inch (RMS) ,

AR Coating Reflectivity

< 0.25%

Note: The other specification and dimension is available too


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