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. 

Yb:YAG shows great promise as a high power laser material. Several applications are being developed in the field of industrial lasers, such as metal cutting and welding. With high quality Yb:YAG now available, additional fields and applications are being explored.

Advantages of Yb:YAG Crystal 

  • 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 and large mechanical strength

  • High optical quality 

Applications

  • With a wide pump band and excellent emission cross-section Yb:YAG is an ideal crystal for diode pumping.
  • High Output Power 1.029 1mm
  • Laser Material for Diode Pumping
  • Materials Processing, Welding and Cutting

Basic Properties: 

Chemical Formula

Y3Al5O12:Yb (0.1% to 15% Yb)

Crystal Structure

Cubic

Output Wavelength

1.029 um

Laser Action

3 Level Laser

Emission Lifetime

951 us

Refractive Index

1.8 @ 632 nm

Absorption Bands

930 nm to 945 nm

Pump Wavelength

940 nm

Absorption band about pump wavelength

10 nm

Melting Point

1970°C

Density

4.56 g/cm3

Mohs Hardness

8.5

Lattice Constants

12.01Ä

Thermal Expansion Coefficient

7.8x10-6 /K , [111], 0-250°C

Thermal Conductivity

14 W.s /m /K @ 20°C

Technical Parameters:

  • Orientation:within 5°

  • Diameter: 3 mm to 10mm

  • Diameter Tolerance: +0.0 mm/- 0.05 mm

  • Length: 30 mm to 150 mm

  • Length Tolerance: ± 0.75 mm

  • Perpendicularity: 5 arc-minutes

  • Parallelism: 10 arc-seconds

  • Flatness:0.1 wave maximum

  • Surface Finish:20-10

  • Barrel Finish: 400 grit

  • End Face Bevel: 0.075 mm to 0.12 mm at 45° angle

  • Chips: No chips allowed on end face of rod; chip having maximum length of 0.3 mm permitted to lie in the area of bevel and barrel surfaces.

  • Clear aperture: Central 95%

  • Coatings: Standard coating is AR at 1.029 um with R<0.25% each face. Other coatings available.