Ytterbium Doped Yttrium Aluminum Garnet
Yb:YAG crystal is one of the most promising laser-active materials and more suitable for diode-pumping than the traditional nd-doped systems. It can be pumped at 0.94mm laser output. Compared with the commonly used Nd:YAG crystal, Yb:YAG crystal has a much larger absorption bandwidth to reduces 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.
We has recently developed a suitable technique to produce the Yb:YAG crystal High quality Yb:YAG crystals are available with different specifications.
Main Advantages:
Very low fractional heating, less than < 11%
Very high slope efficiency
Broad absorption bands, about 18nm @ 940nm
No excited-state absorption or up-conversion
Conveniently pumped by reliable InGaAs diodes at 940nm (or 970nm)
High thermal conductivity and strength
Basic properties:
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Chemical Formula
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Yb:Y3Al5O12
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Crystal Structure
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Cubic
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Lattice Constants
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12.01
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Melting Point
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1970 ℃
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Density
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4.56 g/cm2
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Mohs Hardness
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8.5
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Dopant
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5~30% Yb
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Thermal Expansion Coefficient
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7.8´10-6 /K, [111], 0-250℃
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Thermal Conductivity
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14 W×s /m /K @ 20℃
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Loss Coefficient
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0.003 cm-1
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Index of Refraction
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1.82
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dn/dT
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9´10-6/℃
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Lasing Wavelength
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1030nm, 1050nm
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Fluorescence lifetime
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1.2ms
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Emission cross section
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2.2´10-20cm2
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Pump Wavelength
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0.9~1.0mm
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Absorption band about pump wavelength
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18nm
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Main Specification:
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Diameter Tolerance
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+0.0,-0.1mm, ±0.05mm
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Thickness Tolerance
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±0.02mm(standard), ±0.01mm(special)
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Three-dimensional Tolerance
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±0.02x±0.03±0.02mm
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Parallelism
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<30’
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Flatness
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λ/8
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Perpendicularity
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<10”
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Scratch-Dig
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5-10 per MIL-O-13830a
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Wavefront Distortion
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<λ/2 per inch(λ@1064nm)
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中文版
English
Yb:YAG Crystals