Yb:CaF2 Crystals

Yb:CaF2 Crystals
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Yb:CaF2 is a new laser crystal formed by doping Yb into CaF2. The main emission peak is reported at 1033 nm and 1050 nm, with the emission linewidth of 70 nm.

Because of the absence of undesired loss transitions such as up-conversion, excited state-absorption, and concentration quenching, it has the following characteristics:

  • Low quantum defect
  • A comparably long fluorescence lifetime
  • High thermal conductivity
  • Wide emission linewidth

Ytterbium-doped CaF2 is preferably utilized for high-power diode-pumped systems and laser amplifiers with high optical-to-optical conversion efficiencies. Diode-pumped femtosecond (fs) lasers and amplifiers are one of the important potential applications.

Furthermore, from the current point of view, the crystal growth technologies of Yb: CaF2 promise to be scalable, allowing for producing excellent optical quality material.

  • Kerr-lens mode-locked oscillator
  • Yb: CaF2 thin-disk laser
  • Diode-pumped Yb: CaF2 amplifier

Material Specifications

Orientation（atm％）0.5 mol % ~ 30 mol %
Orientation[111] or [100] < ±0.5°
Orientation Tolerance< 0.5°
parallelism10〞
Verticality15ˊ
Surface Finish10-5(MIL-O-13830A)
Wavefront Distortion<λ/8 @632 nm
Surface Roughness<λ/8 @632 nm
Clear Aperture>90%
Chamfer<0.1×45°
Thickness/Diameter Tolerance±0.05 mm
Biggest Size2*2-15*15 mm×20mm
Thermal Shock Parameters800 W/m
CoatingAR≤ 0.2% @1030nm

Physical and Chemical Properties

Crystal StructureCube
Lattice Constant5.462 Å
Density3.18 g/cm3
Melting Point1418°C
Thermal Conductivity/（W·m-1·K-1 @ 25°C）9.71
Specific Heat Capacity/（J·g-1·K-1）0.8876
Thermo-optic Coefficient（dn / dT）−11.3
Thermal Expansivity /（10-6·K-1 @ 25°C）19
Mohs Hardness4
Young's Modulus/ GPa146
Tensile Strength/ Gpa2

Optical and Spectral Properties

Laser Transition2F5/2→2F7/2
Laser Wavelength1033/1050
Optical Density0.1-0.8
Absorption Coefficient 1.0 cm-1 ~ 7 cm-1
Pump Wavelength980 nm
Emission State Absorption Cross Section2.2×10-20 cm2
Ground State Absorption Cross Section0.8×10-20 cm2
Fluorescence Lifetime2.4 ms
Transmit Bandwidth70 nm
Refractive Index@1.064μm1.2996
Thermo-optic Coefficient（10−6 K−1）-3.7
Transmission10% to 90%
Damage Threshold> 500 MW/cm2

Standard Product

MaterialDiameter，mmCoating
Yb(5%):CaF2dia 5AR≤ 0.2% @1030+940nm
3×3
6×6
Yb(3%):CaF2dia 5
3×3
6×6

Absorption and Emission Spectra

Yb CaF2 laser crystals emission spectrum CRYLINKYb CaF2 laser crystal absorption spectrum CRYLINK

References

[1]  Soulard R ,  Doualan J L ,  Braud A , et al. 1.87μm laser operation by 980nm pumping in Yb,Tm:CaF 2[J]. Optical Materials, 2017, 72:578-582.
[2] Joly, S, Lemesre, et al. A quantitative thermal and thermomechanical analysis for design optimization and robustness assessment of microassembled high power Yb:CaF2 thin-disk Laser[J]. Optics & Laser Technology, 2018.
[3]  Lyberis A ,  Stevenson A J ,  Suganuma A , et al. Effect of Yb3+ concentration on optical properties of Yb:CaF2 transparent ceramics[J]. Optical Materials, 2012, 34(6):965-968.
[4]  Kahle M ,  Krner J ,  Hein J , et al. Performance of a quantum defect minimized disk laser based on cryogenically cooled Yb:CaF2[J]. Optics & Laser Technology, 2017, 92:19-23.
[5]  Yakovlev A I ,  Snetkov I L ,  Palashov O V . The dependence of optical anisotropy parameter on dopant concentration in Yb:CaF 2 and Tb:CaF 2 crystals[J]. Optical Materials, 2018, 77:127-131.
[6]  Pe?A A ,  Camy P ,  Benayad A , et al. Yb:CaF2 grown by liquid phase epitaxy[J]. Optical Materials, 2011, 33(11):1616-1620.

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