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Yb:YAG

Yb:YAG is one of the most promising laser-active materials and more suitable for diode-pumping than the traditional Nd-doped systems. Compared with the  commonly used Nd:YAG crsytal , Yb:YAG crystal has a much larger absorption bandwidth to reduce thermal management requirements for diode lasers, a longer upper-laser level lifetime, three to four times lower thermal loading per unit pump power. Yb:YAG crystal is expected to replace Nd:YAG crystal for high power diode-pumped lasers and other potential applications.

Very low fractional heating, less than 11%                

Very high slope efficiency

Broad absorption bands, about 8nm@940nm

No excited-state absorption or up-conversion

Conveniently pumped by reliable InGaAs diodes

at 940nm(or 970nm) High thermal conductivity

High optical quality

 

 

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 °C ^2 /(°C^ 2 - 0.02119 )+ 17.2049 °C ^2 /(°C ^2 - 1404.45 )

Optical and Spectral Properties

Dopant concentration

Yb: 0.5 ~ 25 at%

Laser Transition

2 F 5/2 °C 2 F 7/2

Laser Wavelength

1030nm

Photon Energy

1.93×10-19J(@1030nm)

Emission Linewidth

9nm

Emission Cross Section

2.0×10-20cm 2

Fluorescence Lifetime

1.2 ms

Diode Pump Band

940nm or 970nm

Pump Absorption Band Width

8 nm

Index of Refraction

1.82

Thermal Optical Coefficient

9 × 10-6/ °C

Loss Coefficient

0.003 cm -1

Yb: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 / Dig per 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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