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Yb:YAG Laser Crystals

Ytterbium-doped yttrium aluminum garnet or Yb:YAG is a laser media used in DPSS laser of very good overall performance. It is more suitable for diode-pumping than the traditional Nd-doped systems.

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Description

Yb:YAG Laser Crystals
Ytterbium-doped yttrium aluminum garnet or Yb:YAG is a laser media used in DPSS laser of very good overall performance. It is more suitable for diode-pumping than the traditional Nd-doped systems. It can be pumped at 0.94μm laser output. 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-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.

Feature
-Very low frictional heating;
-The very high slope efficiency;
-Broad absorption bands, about 8nm@940nm;
-Conveniently pumped by reliable InGaAs diodes at 940nm(or 970nm);
-High thermal conductivity and large mechanical strength;
-High optical quality;

Specifications:

Yb-dopant Concentration	0.2%---30% at% (Tolerance 10% of concentration)	Diameter	20 mm (+0.0/ -0.025mm)
Length	1~70mm, (+/-0.05mm)	Coating Specification	AR @ 940nm or HR @940nm AR @ 1053nm or AR @1030nm or HR @1053nm
Parallelism	< 10 arc seconds	Perpendicularity	< 5 arc minutes
Chamfer	0.15x45°	Barrel Finish	ground or polished
Wavefront Distortion	<λ/10 per inch at 632.8nm for <7mm	Surface Flatness	<λ/10 at 632.8nm
Surface Quality	better than 20/10	Clear Aperture	Central 95%

Physical and Optical Properties:

Chemical Formula	Yb: Y₃Al₅O₁₂	Crystal Structure	Cubic
Lattice Constants	12.01 Å	Melting Point	1970℃
Density	4.56 g/cm³	Mohs Hardness	8.5
Thermal Expansion Coefficient	7.8x10^-6/K, [111], 0-250℃	Thermal Conductivity	14 W.s /m /K @ 20℃
Loss Coefficient	0.003 cm^-1	Index of Refraction	1.82
Lasing Wavelength	1030nm	Pump Wavelength	940nm
Absorption band about pump wavelength	10nm