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(a) Typical pump pulse from the FEL and several emission pulses measured at different pump power. The dB scale corresponds to the attenuation levels of the pump power. Also shown are the time gates chosen for recording of the pump spectra. A sketch of the experimental geometry is shown on the right. (b) Emission from a Si:P:Sb laser as a function of pump photon energy (lower curves). The two curves correspond to signals registered with different time gates as shown in part (a). Upper curves: spectral dependences of the pump radiation transmitted through Si:P and Si:Sb samples with a single-donor concentration close to that of the Si:P:Sb laser. The arrows mark the positions of the photoexcitation transitions for both donor centers.
Dependence of the Si:P:Sb laser emission on the pump photon flux density when pumped resonantly into different excited states of the donors.
Typical emission spectra from the Si:P:Sb laser for different pump photon energies. The labels on the right with an arrow in front correspond to the final pump state. Emission lines from the Sb donors are marked in brown and emission lines from P donors are marked in green. For both donors intracenter emission occurs on the , transitions. The emission lines marked with asterisks indicate Raman lasing and the dashed diagonal lines indicate the corresponding Stokes shift.
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