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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 Crystal
  • 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: 515 at%

Wavefront Distortion

0.125/inch

Extinction Ratio

28 dB

Rod Sizes

Diameter:220mm,Length:5150mm 
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

/10

Surface Quality

10/5(MIL-PRF-13830B)

Chamfer

0.006"0.002" at 45 5

AR Coating Reflectivity

0.25% (@1030nm)

Single pass loss

<3103cm-1

Optical and Spectral Properties of Yb:YAG Crystal

Laser Transition

2F5/22F7/2

Laser Wavelength

1030nm

Photon Energy

1.9310-19J(@1030nm)

Emission Linewidth

9nm

Emission Cross Section

2.010-20cm2

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

910-6/

Loss Coefficient

0.003 cm-1

 
 
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