Yb:CaF₂ Yb(3%):CaF₂
Yb:CaF₂ is a new laser crystal made by doping Yb into CaF₂. Its main emission peaks are at 1033nm and 1050nm, with an emission linewidth of 70nm. The absence of undesirable loss transitions such as upconversion, excited-state absorption and concentration quenching gives it a small quantum defect, long fluorescence lifetime, high thermal conductivity and broad emission linewidth. These properties make Yb:CaF₂ a preferred material for high-power diode-pumped systems. Laser amplifiers with high optical-to-optical conversion efficiency are an important potential application in diode-pumped femtosecond (fs) lasers and amplifiers. The crystal-growth technology for Yb:CaF₂ is also considered scalable, enabling production of high-quality optical material.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Diameter [Coating ：AR≤ 0.2% @1030+940nm] | dia 5 |
| Coating [Diameter ，mm：dia 5 / @1030+940nm] | AR≤ 0.2% @1030+940nm |
| Diameter [Coating ：AR≤ 0.2% @1030+940nm] | 3 mm × 3 mm |
| Coating [Diameter ，mm：3×3 / @1030+940nm] | AR≤ 0.2% @1030+940nm |
| Diameter [Coating ：AR≤ 0.2% @1030+940nm] | 6 mm × 6 mm |
| Coating [Diameter ，mm：6×6 / @1030+940nm] | AR≤ 0.2% @1030+940nm |
| Concentration tolerance | 0.5 mol % ~ 30 mol % |
| Orientation | [111] or [100] < ±0.5° |
| Orientation tolerance | < 0.5° |
| Parallelism | 10〞 |
| Perpendicularity | 15ˊ |
| Surface Quality | 10-5(MIL-O-13830A) |
| Wavefront distortion [@632 nm] | <λ/8 @632 nm |
| Surface Flatness [@632 nm] | <λ/8 @632 nm |
| Clear Aperture Dimension | >90% |
| Chamfer | <0.1×45° |
| Thickness / Diameter Tolerance | ±0.05 mm |
| Maximum dimensions | 2*2-15*15 mm×20mm |
| Thermal shock resistance parameter | 800 W/m |
| Coating [@1030nm] | AR≤ 0.2% @1030nm |
| Crystal Structure | Cubic |
| Lattice constant | 5.462 Å |
| Density | 3.18 g/cm³ |
| Melting point | 1418°C |
| Thermal conductivity [@ 25°C] | 9.71 W·m⁻¹·K⁻¹ |
| Specific heat capacity | 0.8876 J·g⁻¹·K⁻¹ |
| Thermo-optic coefficient dn / dT | −11.3 |
| Thermal expansion rate [@ 25°C] | 19 10⁻⁶·K⁻¹ |
| Hardness | 4 Mohs |
| Young's modulus | 146 GPa |
| Tensile strength | 2 Gpa |
| Laser transition | ²F₅/₂→²F₇/₂ |
| Laser Wavelength | 1033/1050 |
| Optical density | 0.1-0.8 |
| Absorption coefficient | 1.0 cm⁻¹ ~ 7 cm⁻¹ |
| Pump Wavelength | 980 nm |
| Fluorescence lifetime | 2.4 ms |
| Emission bandwidth | 70 nm |
| Refractive Index [@1.064μm] | 1.2996 |
| Thermo-optic coefficient | -3.7 10−6 K−1 |
| Transmission | 10% to 90% |
| Damage threshold | > 500 MW/cm² |
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