M Jelínek, V Kubeček, W Ma, B Zhao, D Jiang, L Su – Laser Physics Letters, 2016
The laser operation in the pulsed as well as continuous-wave regime of a modified-Bridgeman-grown 0.5 at.% Ho:CaF2 crystal at 83 K pumped by a Tm:fiber laser is reported. The maximum output power was 2.37 W at 2060 nm or 1.3 W at 2110 and 2130 nm. Continuous tuning range over 90 nm from 2030 to 2120 nm was achieved using a birefringent filter. The Ho:CaF2 fundamental spectroscopic properties as absorption and fluorescence spectra at 83 and 293 K are also presented.
… 2.2. Fluorescence spectrum and lifetime. The fluorescence spectrum as well as the laser output wavelengths were measured using a spectrometer StellarNet NirX with the wavelength range 1490–2240 nm and resolution ~10 nm. …
