Yb:CaF2 crystals
Main features
- Isotropic crystal (cubic symmetry)
- Low quantum defect
- Long lifetime of the 2F5/2 ytterbium energy level
- Wide optical transmission
- Low dispersion behavior
- Limited nonlinear effects under intense laser irradiation
- Custom crystals available upon request
Application examples
- Diode-pumped femtosecond solid-state lasers aiming at the generation of high-energy pulses
- Ultrashort pulses with high average power
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- Description
- Properties
- Absorption and emission curves
- Standard specifications
Yb3+:CaF2 are among most studied and promising crystals for the development of short-pulse, high-energy, high-power diode-pumped solid-state lasers. There are several reasons that explain this trend. Firstly, calcium fluoride is a simple cubic crystal whose crystallographic properties are fairly well known.
Moreover, this crystal can be grown of large dimension and optical quality. The simple structure of this crystal contributes to its good thermal properties. Finally, Yb-doped calcium fluorides feature very broad and smooth emission bands, which is exceptional for cubic crystals.
| Spectroscopic and thermo-mechanical properties | |
|---|---|
| Absorption peak wavelength | 976 nm |
| Absorption cross-section at peak | 0,54 × 10-20 cm2 |
| Laser wavelength | 1020-1060 nm |
| Lifetime of 2F5/2 energy level | 2,4 ms |
| Emission cross-section @1053 nm | 0,16 × 10-20 cm2 |
| Refractive index @1040nm | 1,43 |
| Crystal structure | Cubic |
| Density | 3,18 g/cm3 |
| Mohs hardness | 4 |
| Thermal conductivity | 5,4 Wm-1K-1 |
| dn/dT | -11,3 × 10-6 K-, |
| Thermal expansion coefficient | 18,9 × 10-6 K-1 |
| Typical doping level | 1-5 at.% |
| Yb:CaF2 crystals | |
|---|---|
| Orientation | [111] |
| Clear aperture | >90% |
| Face dimensions tolerance | +0,0/-0,1 mm |
| Length tolerance | ±0,1 mm |
| Parallelism error | <10 arcsec |
| Perpendicularity error | <10 arcmin |
| Protective chamfers | <0,15 mm at 45˚ |
| Surface quality | 10-5 S-D |
| Surface flatness | <λ/10@632,8 nm |
| Coatings | AR(R<0,5%)@980 nm + AR(R< 0,35%)@1040-1070 nm |
| Laser-induced damage threshold | >10 J/cm2@1040 nm, 10 ns |
| Mount | Unmounted |
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Face dimensions
Length
End faces
Doping
Coatings
SKU
PRICE
QUANTITY
⌀3 mm
3 mm
Right-angle cut
5%
AR/AR@976 + 1040-1070 nm
7027
590 €
⌀3 mm
5 mm
Right-angle cut
3%
AR/AR@976 + 1040-1070 nm
7028
590 €
⌀3 mm
10 mm
Right-angle cut
0,7%
AR/AR@976 + 1040-1070 nm
7029
590 €
⌀3 mm
3 mm
Brewster-angle cut
5%
uncoated
7030
540 €
⌀3 mm
5 mm
Brewster-angle cut
3%
uncoated
7031
540 €
⌀3 mm
10 mm
Brewster cut
0,7%
uncoated
7032
540 €
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