Abstract
Oxygen atoms in a hydrogen/oxygen flame were excited from the ground 2p 3P state by two photons at 226 nm using 10 ps laser pulses. The subsequent deexcitation to the 3s 3S state results in fluorescence at 845 nm. The inverted population created between the two excited levels also generated stimulated emission which occurred as an enhanced emission along the laser beam and was studied, temporally resolved, using a streak camera, with a resolution of a few ps. The much weaker fluorescence could only be registered on a photomultiplier with a temporal resolution of 1 ns. The upper and lower limits of the quenched fluorescence lifetime were determined to be 1 ns and 160 ps, respectively. The signal strength of the fluorescence and the stimulated emission was captured pulse by pulse in order to study the correlation. The power dependence of the laser-induced fluorescence indicated substantial depletion of the excited level by other processes, the most important of which is probably the stimulated emission. Using a nanosecond pulsed laser, stimulated emission was induced and studied, temporally resolved, using a streak camera simultaneously with the exciting laser pulse intensity.
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