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 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.
Yb:YAG crystal at 1030nm is a good substitute for a Nd:YAG crystal at 1064nm and its second harmonic at 515nm may replace Ar-ion laser(with a large volume), which emit at 514nm.

Advantages of Yb:YAG Crystals

  • Very low fractional heating, less than11%
  • 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

Material and Specifications

Dopant concentration Yb: 5~15 at%
Wavefront Distortion ≤ 0.125 λ/inch
Extinction Ratio ≥28 dB
Rod Sizes Diameter:2~20 mm, Length:5~150 mm
Upon request of customer
Dimensional Tolerances Diameter:+0.00 "/-0.002 "mm,
 Length: ± 0.02 "
Barrel Finish Ground Finish: 400# Grit
Parallelism ≤ 10 "
Perpendicularity ≤ 5 ′
Flatness λ/10
Surface Quality 10/5 (MIL-PRF-13830B)
Chamfer 0.006 " ±0.002 " at 45 °± 5 °
AR Coating Reflectivity ≤ 0.25 % (@1030 nm)
Single pass loss <3 × 103 cm-1

Optical and Spectral Properties of Yb:YAG Crystal

Laser Transition 2F5/22F7/2
Laser Wavelength 1030 nm
Photon Energy 1.93×10-19J (@1030 nm)
Emission Linewidth 9 nm
Emission Cross Section 2.0 × 10-20 cm2
Fluorescence Lifetime 1.2 ms
Diode Pump Band 940 nm or 970 nm
Pump Absorption Band Width 8 nm
Index of Refraction 1.82
Thermal Optical Coefficient 9×10-6 /℃
Loss Coefficient 0.003 cm-1




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