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Yb:YAG Laser Crystal
Ytterbium-doped YAG (Yb:YAG) is an active laser crystal lasing at 1030 nm, with a broad, 18 nm wide absorption band at 940 nm. It is one of the most useful crystal for high-power, diode-pumped solid state lasers. The dopant levels range between 0.2-30% of replaced yttrium atoms. Yb:YAG has very low fractional heating, very high slope efficiency, and no excited-state absorption or up-conversion, high mechanical strength and high thermal conductivity. Yb:YAG can be pumped by reliable InGaAs laser diodes at 940 or 970 nm.
YAG physical & chemical properties
Chemical Formula: Y3Al5O12
Crystal Structure: Cubic
Lattice Constants: 12.01Å
Melting Point: 1970°C
Density: 4.55 g/cm³
Mohs Hardness: 8.5
Thermal Expansion Coefficient: 7.8 x 10E-6/K [111], 0-250°C
Thermal Conductivity: 14 W/m /K @20°C, 10.5 W /m /K @100°C
Yb:YAG Optical Properties
Refractive Index: 1.82 @1064 nm
Lasing Wavelength: 1030 nm
Emission Linewidth: 9 nm
Stimulated Emission Cross Section: 2.2 x 10E-20 cm²
Absorption Bands: 940 nm, 970 nm
Absorption bandwidth: 8 nm
Intrinsic Flouresence Lifetime (< 15% Yb doping): 967 μs
Loss Coefficient: 0.003 /cm @ 1064 nm
Thermal Optical Coeff. (dn/dT): 90E-6/°C
Capability of Yb:YAG Laser Crystal
1) Yb dopant concentration: 0.2 ~ 30% atm%
Dopant tolerance: within 10% of concentration.
2) Diameter: 2 ~ 20 mm
3) Length: 1 ~ 70 mm
4) Anti-reflection Coating: R<0.1% @ 1030 nm
High transmission Coating: T>95% @ 940 nm
High reflection Coating: R>99.8% @ 1030 nm
Yb:YAG Laser Crystal General Specification
1) Orientation: <111> crystalline direction (+/-0.5°)
2) Wavefront Distortion: λ/10 per inch
3) Surface quality: better than 20/10 Scratch/Dig
4) Parallelism: 10 arc seconds
5) Perpendicularity: 5 arc minutes
6) Surface flatness: λ/10 at 633 nm
7) Clear aperture: Central 95%
8) Chamfer: 0.15mm @45°
9) Damage threshold: over 15J/cm² (without coating), over 700 MW/cm² (coating)