Yb:YAG for 1030nm Laser

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 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: 5～15 at%
Wavefront Distortion	≤ 0.125λ/inch
Extinction Ratio	≥28 dB
Rod Sizes	Diameter:2～20mm,Length:5～150mm 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	λ/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	<3×103cm-1

Optical and Spectral Properties of Yb:YAG Crystal

Laser Transition	2F5/2→2F7/2
Laser Wavelength	1030nm
Photon Energy	1.93×10-19J(@1030nm)
Emission Linewidth	9nm
Emission Cross Section	2.0×10-20cm2
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	9×10-6/℃
Loss Coefficient	0.003 cm-1