Pump and probe setup used in this experiment.
Energy level diagram of ions in the BNN crystal. Dashed lines show the transitions which are produced by using Nd:YAG pulsed laser and tunable cw Ti:sapphire laser at 850 nm . Solid line shows the optical gain transitions in the four (850 nm) level schemes.
RT absorption spectrum of BNN:Er in the 400–700 nm region.
(a) Emission cross section of the transition. (b) Emission spectrum for the doped BNN sample at 850 nm probe wavelengths. The solid line corresponds to and the dashed line shows . The arrow indicated the probe wavelength.
Optical gain as a function of the pump energy density from 35 to with a power probe density of .
Experimental measure (dot line) and theory simulation (solid line) of the optical gain as a function of time. The inset of the figure shows the optical gain as a function of time at different pump energy densities from 35 to with a power probe density of . The arrow shows the increasing direction of pump energy density.
Simulation of the population evolution of and levels according to the rate equations.
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