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Yb: YAG Crystal

Yb:YAG CrystalYb: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 Nd:YAG crystal at 1064nm and its second harmonic at 515nm may replace Ar-ion laser(with a large volume), which emits at 514nm.


Yb:YAG Crystal Features:

- 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


Yb:YAG Crystal Physical Properties:


 Crystal Structure

 Cubic

 Lattice Parameters

 12.01 Å

 Melting Point

 1970 °C

 Moh Hardness

 8.5

 Density

 4.56±0.04 g/cm3

 Specific Heat (0-20)

 0.59 J/g.cm3

 Modulus of Elasticity

 310 GPa

 Young's Modulus

 3.17 x 104 Kg/mm2

 Poisson Ratio

 0.3(est.)

 Tensile Strength

 0.13~0.26 GPa

 Thermal Expansion Coefficient

 [100]Direction:8.2x10-6 / °C (0~250 °C )

 [110]Direction:7.7x10-6 / °C (0~250 °C )

 [111]Direction:7.8x10-6 / °C (0~250 °C )

 Thermal Conductivity

 14W/m/K(@20 °C )

 10.5W/m/K(@100 °C )

 Thermal Shock Resistance

 790W/m


Yb:YAG Crystal Optical Properties:


 Dopant concentration

 Yb: 0.5 ~ 25 at%

 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/ °C

 Loss Coefficient

 0.003 cm-1


Yb:YAG Standard Product Specifications:


 Orientation

 <111> or <100> crystalline within 5°

 Wavefront distortion

 λ /8 @ 633 nm

 Extinction Ratio 

 >25dB

 Dimension Tolerances

 Diameter: ±0.025 mm, Length: ±0.5 mm

 Surface quality

 10/5 Scratch / Dig per MIL-O-1380A

 Parallelism

 < 10 arc seconds

 Perpendicularity

 < 5 arc minutes

 Flatness

 < λ /10 @ 633 nm

 Chamfer

 <0.1 mm @ 45deg.

 Barrel Finish

 Ground Finish: 400# Grit

 AR Coating Reflectivity

 0.25% @ 1030nm