Rare Earth Ions Doped Barium Yttrium Fluoride (RE: BaY2F8) Laser Crystals
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Barium Yttrium Fluoride (BaY2F8) crystallizes in the monoclinic Cm space group. It has good light transmittance in the range of 250~15000 nm; low phonon energy (360-380 cm-1), lower refractive index and higher laser damage threshold, larger laser emission cross section, easy to dope with rare earth ions or transition metal ions. It is widely used as laser host when doped with rare earth ions.
Technical Data
| Crystal Structure | monoclinic, a=0.69829 nm, b=1.05190 nm, c=0.42644 nm, α=γ=90°, β=99.676° |
| Density | 4.97 g/cm³ |
| Melting Point | 998 ℃ |
| Thermal Conductivity | 6 W/(mK) |
| Thermal Expansion Coefficient |
1.8×10-5 /ºC |
| Hardness | 4~5 |
| Refractive Index | ~1.5 |
| Size | up to 30 mm |
| Thickness | up to 50 mm |
| Orientation | a-cut, b-cut, c-cut |
| Doping Ion |
Tm3+ |
Ho3+ |
Tm3+, Ho3+ |
Yb3+ |
Pr3+ |
| Absorption Peak Wavelength |
791 nm |
899 nm |
791 nm |
960 nm |
445 nm |
| Absorption Cross Section |
0.94×10-20 cm2 |
1.29×10-21 cm2 |
0.94×10-20 cm2 |
9.8×10-21 cm2 |
5.9×10-20 cm2 |
| Fluorescence Lifetime | 17 ms | 16.5 ms | 10.1 ms | 2.4 ms |
43 μs (3P0) |
| Laser Wavelength | 1932 nm | 2057 nm | 2057 nm | 1017 nm |
495 nm, 524 nm, 553 nm |
| Emission Cross Section | 0.25×10-20 cm2 | 1.2×10-20 cm2 | 1.2×10-20 cm2 | 6.0×10-21 cm2 | 2.6×10-20 cm2 (495 nm) |
Reference