Yb:YAG Laser Crystal

Ytterbium-doped yttrium aluminum garnet(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 Nd:YAG crystal, 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.

Advantages

1 ) Very low fractional heating, less than 11%

2 ) Very high slope deficiency

3 ) Broad absorption bands, about 8nm@940nm

4 ) No excited-state absorption or up-conversion

5 ) Conveniently pumped by reliable in GaAs diodes

6 ) High thermal conductivity@ 940nm (or 970nm)

7 ) High optical quality

Specifications

Material

Yb:YAG

Yb-Dopant Concentration

0.5%–25at%

Orientation

<111> or <100>

Dimensions

Diameter:2mm-50mm, Length:5-180mm(Upon customer’s request)

Clear Aperture

Central 95%

Extinction Ratio

>30dB (depends on actual size)

Diameter Tolerance

+0/-0.04mm

Length Tolerance

+0.5/-0mm

Flatness

<λ/[email protected]

Damage Threshold

>700MW/cm2 @10ns 10HZ

Barrel Finish

Ground Finish 400#Grit

Scratch/Dig

10-5@MIL-0-13830A

Parallelism

 <10 arc seconds

Perpendicularity

 <5 arc minutes

Wavefront Distortion

λ/8  per inch @632.8nm

Anti-Reflection Coating

R<0.2%@1030nm per surface

Properties

Laser Transition

2F5/2 →2F7/2

Laser Wavelength

1030nm

Photon Energy

1.93*10ˉ19 J@1030nm

Emission  Linewidth

9nm 

Fluorescence Lifetime

1.2ms

Diode Pump  Band 

940nm or 970nm

Pump Absorption Band Width

8nm

Index of Refraction

1.82@1030nm

Loss Coefficient

0.003 cm-1