Due to its hardness and flexible and inexpensive manufacturing process, CaF 2 has been used in many substrate materials for laser crystals. As a rising ion, Yb 3+ also allows a three-level laser scheme that leads to a low-level error and a longer fluorescence life.
Product Details
Explanation
Due to its hardness and flexible and inexpensive manufacturing process, CaF 2 has been used in many substrate materials for laser crystals. As a rising ion, Yb 3+ also allows a three-level laser scheme that leads to a low-level error and a longer fluorescence life. Yb 3+: CaF 2 can also provide high optical efficiency and high output power due to low thermal load. Recently, ytterbium doped alkaline-earth fluoride has been used mostly in diode-pumped femto-second lasers and amplifiers. Standard Czochralski or
Alkaline-soil fluorides, which can be easily grown using Bridgman technique, show great potential in wide transmission range, high damage threshold and low dispersion behavior.
Yb 3+ Absorption Spectrum: CaF 2 crystal
Specifications
• Low quantum defect
• High damage threshold, good thermal conductivity
• Long fluorescent life
• Low dispersion behavior
• Wide suction bandwidth
• Limited nonlinear effects under intense laser irradiation
Applications
• High-power ultra-thin thin disk oscillators
• Passive mode locking oscillators
• Solid state adjustable laser
Chemical and physical properties
| feature | value |
| Chemical formula | Yb 3+ : CaF 2 |
| Crystal structure | cubic |
| Cage parameters, Å | 5,462 |
| Orientation | [111] veya [100] <± 0.5 ° |
| Bulk density | 3,18 g / cm 3 |
| Mohs hardness | 4 |
| Young’s module | 146 GPa |
| Tensile strength | 2 GPa |
| Melting point | 1418 ° C |
| Thermal conductivity | 9.71 |
| Specific Heat/ (J · g -1 · K -1 ) | 0,8876 |
| Thermal Expansion / （10 -6 / ° C @ 25 ° C） | (16.5 … 19.4) |
| Thermal shock resistance parameter | 800 W / m |
| Refractive Index @ 1064 nm | 1,2996 |
Optical properties
| feature | value |
| Optical density | 0,1 ila 0,8 |
| Fluorescence life | 2.4ms |
| concentrations | % 0.5 mol% ~ 30 mol% |
| Emission wavelength | 1015 nm ~ 1060 nm |
| Coefficient of absorption | 1,0 cm -1 ~ 7 cm -1 |
| Suction section of soil condition | 0.8×10 -20 cm 2 |
| Emission state absorption cross section: | 2.2×10 -20 cm 2 |
| transmission | % 10 ila% 90 |
| coatings | AR≤% 0,2 @ 1030nm |
| Damage Threshold: | > 500 MW / cm 2 |
Polishing properties
| feature | value |
| Orientation Tolerance | <0,5 ° |
| Thickness / Diameter Tolerance | ± 0,05 mm |
| Surface Flatness | <λ / 832 nm |
| Ripple Distortion | <λ / 832 nm |
| Surface quality | 05/10 |
| Parallel | 10 “ |
| Vwertical | 15′ |
| Open aperture | >% 90 |
| groove | <0.1 x 45 ° |
| Maximum dimensions | 2 * 2-15 * 15 mm × 20 mm |
Standard products
| Material | Dimensions, mm | coatings |
| Yb (% 5): CaF 2 | dia 5 | AR ve le; % 0.2 @ 1030 + 940nm |
| 3×3 | ||
| 6×6 | ||
| Yb (% 3): CaF 2 | dia 5 | |
| 3×3 | ||
| 6×6 |