Yb:YLF crystal, also known as Ytterbium-doped yttrium lithium fluoride is used in production of short and ultrashort pulse lasers. Due to the similar size, yttrium ions can be replaced with ytterbium rare earth ions without strongly affecting the lattice structure.
Yb:YLF crystals available from stock
Description
Yb-doped yttrium lithium fluoride (Yb:YLF) crystal is used in production of short and ultrashort pulse lasers. Due to the similar size, yttrium ions can be replaced with ytterbium rare earth ions without strongly affecting the lattice structure. Negative thermo-optic coefficients of the Yb:YLF crystal leads to defocusing thermal lens which could be partly compensated by the focusing effect caused by the thermal expansion. Wide absorption bandwidth centered at 960 nm makes it well suited to be pumped with laser diodes. Combining it with thermo-optical properties of the Yb:YLF crystal it allows to produce lasers with a better beam quality than from the other Yb-doped laser crystals.
Specifications
Physical and Thermal Properties
| Chemical formula | Yb:YLiF4 (Yb-doped yttrium lithium fluoride) |
| Possible dopant concentrations | 5 – 20 at. % |
| Crystal structure | tetragonal |
| Lattice constants | a = 5.16 Å, c = 10.74 Å |
| Density | 3.95 g/cm3 |
| Mohs hardness | 5 |
| Melting point | 825 °C |
| Refractive index (at 1064 nm) | n = 1.44 |
| Thermal conductivity | K = 6 W/(mxK) |
| Termal expansion coefficients | α[a] = 13 x 10-6 °C-1, α[c] = 8 x 10-6 °C-1 |
| Thermo-optic coefficients | dna/dT = -6.6 × 10-6 °C-1, dnc/dT = -4.6 × 10-6 °C-1 |
Spectroscopic Properties
| Absorption peak wavelength | 960 nm |
| Absorption cross-section at peak wavelength | 10.5 × 10-21 cm2 |
| Absorption bandwidth (FWHM) | 10 nm |
| Emission wavelength | 1007 – 1027 nm |
| Emission cross-section at 1017 nm | 4.1 × 10-21 cm2 |
| Fluorescence lifetime | 2.1 ms |
Standard Manufacturing Specifications
| Cut orientation error: | +/- 30 arcmin |
| Dimensions tolerance: | +/- 0.1 mm |
| Clear aperture: | > 85% of aperture dimensions |
| Surface quality: | 20-10 S-D |
| Surface flatness: | < λ/10 @ 633 nm |
| Parallelism error: | < 20 arcsec |
| Perpendicularity error: | +/- 5 arcmin |
Standard Products
Product | Doping | Orientation | Dimensions | Length | Wedge | Coatings | Price | Delivery | Quantity | |
|---|---|---|---|---|---|---|---|---|---|---|
| Yb-YLF-10-3x3x1 | 10 at.% | a-cut | 3 x 3 mm | 1 mm | < 20 arcsec | Uncoated | 460.00€ | 2 weeks | | |
| Yb-YLF-10-3x3x4 | 10 at.% | a-cut | 3 x 3 mm | 4 mm | < 20 arcsec | Uncoated | 0.00€ | request | | |
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