Yb:CaF2 Description
Yb:CaF2 is a new type of laser crystal formed by doping Yb into CaF2. The main emission peaks are 1033nm and 1050nm, respectively, and the emission line width is 70nm. Since there are no undesired loss transitions such as upconversion, excited-state absorption and concentration quenching, they have small quantum defects, long fluorescence lifetime, high thermal conductivity, and wide emission line width. Ytterbium-doped CaF2 is a high-power diode pumping system The preferred material, a laser amplifier with high optical-to-optical conversion efficiency is one of the important potential applications of diode-pumped femtosecond (fs) lasers and amplifiers. In addition, from the current point of view, the Yb:CaF2 crystal growth technology has scalability, which enables the production of high-quality optical materials.
Yb:CaF2 Specifications
Material specification
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Concentration tolerance (atm%)
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0.5 mol % - 30 mol %
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Orientation
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[111] or [100] < ±0.5°
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Orientation tolerance
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< 0.5°
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Parallelism
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10〞
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Verticality
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15ˊ
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Surface Quality
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10-5(MIL-O-13830A)
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Wavefront distortion
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<λ/8 @632 nm
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Surface roughness
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<λ/8 @632 nm
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Clear aperture
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>90%
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Chamfer
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<0.1×45°
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Thickness/diameter tolerance
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±0.05 mm
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biggest size
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2*2-15*15 mm×20mm
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Thermal shock resistance parameters
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800 W/m
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Coating
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AR≤ 0.2% @1030nm
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Physical and Chemical Properties
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Crystal structure
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Cubic
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Lattice constant
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5.462 Å
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Density
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3.18 g/cm3
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Melting point
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1418°C
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Thermal conductivity/(W·m-1·K-1 @ 25°C)
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9.71
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Specific heat capacity/(J·g-1·K-1)
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0.8876
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Thermo-optical coefficient (dn/dT)
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−11.3
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Thermal expansion rate/(10-6·K-1 @ 25°C)
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19
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Hardness (Mohs)
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4
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Young’s modulus/ GPa
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146
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Tensile strength/ Gpa
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2
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Optical and spectral properties
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Laser transition
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2F5/2→2F7/2
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Laser wavelength
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1033/1050
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Optical density
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0.1-0.8
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Absorption coefficient
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1.0 cm-1 ~ 7 cm-1
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Pump wavelength
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980 nm
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Absorption cross-section in the emission state
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2.2×10-20 cm2
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Ground-state absorption cross-section
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0.8×10-20 cm2
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Fluorescence lifetime
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2.4 ms
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Emission bandwidth
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70 nm
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Refractive index@1.064μm
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1.2996
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Thermal optical coefficient (10−6·K−1)
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-3.7
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transmission
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10% to 90%
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Damage threshold
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> 500 MW/cm2
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Absorption and emission spectra
Yb:CaF2 Standard Product
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Material
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Diameter, mm
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Coating
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Yb(5%):CaF2
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dia 5
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AR≤ 0.2% @1030+940nm
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3×3
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6×6
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Yb(3%):CaF2
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dia 5
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3×3
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6×6
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Yb:CaF2 Applications
- Kerr lens mode-locked oscillator
- Yb: CaF2 thin disk laser
- Diode-pumped Yb: CaF2 amplifier
Yb:CaF2 Packaging
Our Yb:CaF2 is carefully handled during storage and transportation to preserve the quality of our product in its original condition.
