Table 7.
∼ 2.1 μm laser properties of Ho3+ in GPGN glass. σabs is the peak absorption cross section of 5I7 absorption band of Ho3+; τr is the measured fluorescence lifetime of 5I7 energy state; σems is the peak emission cross-section, λp is the pump wavelength; λs is the signal wavelength, Pth is the laser threshold power; FWHM is full width half maximum laser spectral width; ηs is the laser slope efficiency.
| Glass material | Ho3+ concentration | σabs (cm2) | τr (ms) | σems (cm2) | λp (nm) | λs (nm) | FWHM (nm) | Pth (mW) | ηs (%) |
|---|---|---|---|---|---|---|---|---|---|
| Ho3+: GPGN (GeO2-PbO-Ga2O3–Na2O) | 2.6 wt% | 4.4 × 10−21 | 8.11 | 5.5 × 10−21 | 1945 | 2095 | 8 | 100 | 20 |