We present a highly efficient ring-cavity all-solid-state ${\mathrm{BaWO}}_4$ Raman laser generating at both the long-shift (${\nu }_1=925{\mathrm{cm}}^{-1}$) and short-shift (${\nu }_2=332{\mathrm{cm}}^{-1}$) Raman lines under external picosecond synchronous pumping at the wavelength of 1063 nm. Very high slope efficiencies and output pulse energies of 68.8% and 103 nJ at the ${\nu }_1$-shifted Stokes wavelength of 1179 nm, and 38.6% and 53 nJ at the (${\nu }_1+{\nu }_2$)-shifted Stokes wavelength of 1227 nm have been achieved. Self-mode locking of the (${\nu }_1+{\nu }_2$)-shifted Stokes field under intracavity pumping by the ${\nu }_1$-shifted Stokes field allowed to realize 12-fold shortening of the 1227 nm radiation pulse down to 3 ps close to the shorter dephasing time of the ${\nu }_2$ Raman line at the output pulse peak power 1.5 times higher than the pump peak power.

This Letter determines the ${\mathrm{Cr}}^{2+}\text{-}{\mathrm{Fe}}^{2+}$ ions energy transfer process parameters in the ${\mathrm{Zn}}_{1-x}{\mathrm{Mn}}_x\mathrm{Se}\text{:}{\mathrm{Cr}}^{2+},{\mathrm{Fe}}^{2+}$ ($x=0.3$) crystal and demonstrates a dipole-dipole type of the ${\mathrm{Cr}}^{2+}\text{-}{\mathrm{Fe}}^{2+}$ ions nonradiative energy transfer. The intracavity ${\mathrm{Cr}}^{2+}\text{-}{\mathrm{Fe}}^{2+}$ pumping as well as pumping through ${\mathrm{Cr}}^{2+}\text{-}{\mathrm{Fe}}^{2+}$ energy transfer in the ${\mathrm{Zn}}_{1-x}{\mathrm{Mn}}_x\mathrm{Se}\text{:}{\mathrm{Cr}}^{2+}$, ${\mathrm{Fe}}^{2+}$ ($x=0.3$) crystal under 1735 nm excitation by an YLF:Er laser was realized in a temperature range of 78 up to 150 K for the first time, to the best of our knowledge. Output pulse energy up to 20 μJ at $\sim 4400\mathrm{nm}$ under 5.5 mJ of 1735 nm absorbed pump energy was obtained for the ${\mathrm{Cr}}^{2+}\text{-}{\mathrm{Fe}}^{2+}$ ions energy transfer mode.

Six-μm laser generation at room temperature was achieved from ${\mathrm{Fe}}^{2+}$-doped ${\mathrm{Cd}}_{1-x}{\mathrm{Mn}}_x\mathrm{Te}$ solid-solution active media for the first time, to the best of our knowledge. Laser properties of ${\mathrm{Fe}}^{2+}\text{:}{\mathrm{Cd}}_{1-x}{\mathrm{Mn}}_x\mathrm{Te}$ crystals with various concentrations of manganese Mn ($x=0.1$, 0.52, 0.56, 0.68, and 0.76) were investigated. The increase of Mn content in these crystals was shown to result in an almost similar long-wavelength shift of absorption, fluorescence, and laser output spectra of about $\sim 60\mathrm{nm}$ per each 10% of Mn. Laser generation was achieved in all crystals with maximum output energies up to 30 μJ (for $x=0.52$). The laser central oscillation wavelength is significantly influenced by Mn concentration and varies in the range from 5400 nm up to 6000 nm.