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  • Yb:YAG Crystals
  • Yb:YAG Crystals

Yb:YAG Crystals

Features:

  • 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
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Specifications:

Yb-dopant Concentration 0.2%---30% at% (Tolerance 10% of concentration) Diameter 20 mm (+0.0/ -0.025mm)
Length 1~70mm, (+/-0.05mm) Coating Specification AR @ 940nm or HR @940nm 

AR @ 1053nm or AR @1030nm or HR @1053nm

Parallelism < 10 arc seconds Perpendicularity < 5 arc minutes
Chamfer 0.15x45° Barrel Finish ground or polished
Wavefront Distortion <λ/10 per inch at 632.8nm for <7mm Surface Flatness <λ/10 at 632.8nm
Surface Quality better than 20/10 Clear Aperture Central 95%

 

Physical and Optical Properties:

Chemical Formula Yb:Y3Al5O12 Crystal Structure Cubic
Lattice Constants 12.01 Å Melting Point 1970℃
Density 4.56 g/cm3 Mohs Hardness 8.5
Thermal Expansion Coefficient 7.8x10-6/K, [111], 0-250℃ Thermal Conductivity 14 W.s /m /K @ 20℃
Loss Coefficient 0.003 cm-1 Index of Refraction 1.82
Lasing Wavelength 1030nm Pump Wavelength 940nm
Absorption band about pump wavelength 10nm

Ytterbium-doped yttrium aluminum garnet or Yb:YAG is a laser media used in DPSS laser of very good overall performance. It is more suitable for diode-pumping than the traditional Nd-doped systems. It can be pumped at 0.94μm laser output. Compared with the commonly used Nd:YAG crystal, Yb:YAG crystal has a much larger absorption bandwidth to reduce thermal management requirements for diode lasers, a longer upper-state 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.