| Characteristic | Value |
|---|---|
| Initial transmission | 5-95 % |
| Thickness | 0.5–5 mm |
| Diameter | 3–20 mm |
| Absorption cross section from the ground state at a wavelength of 1.32 microns | 7.3 × 10-18 cm2 |
| Absorption cross section from the ground state at a wavelength of 1.06 microns | 3.0 × 10-18 cm2 |
| Relaxation time (3T2→3A2 ) | 20 ns |