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 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 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
Material
Optical and Spectral Properties of Yb:YAG Crystal:
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Angle tolerance:
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Δθ< ± 0.5°; Δφ< ±0.5°
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Dimensional Tolerance:
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(W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm)
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Flatness:
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<λ/8 at 633nm
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Surface Quality:
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10/5 S/D
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Parallelism:
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< 20 arc seconds
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Perpendicularity:
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< 5 arc minutes
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Wavefront Distortion:
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<λ/8 at 632.8nm
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Clear Aperture:
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Central 95%
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Chamfer:
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0.15x45°
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Coating:
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Customized
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