Chemical generation of optical gain at 471 nm

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Abstract
Stimulated emission on the P(43) and R(70) transitions of the BiF (A-X, v′=1 to v″=4) band was demonstrated, using the reaction of premixed FN3 and Bi(CH3)3. The transient chemistry was thermally initiated by a pulsed CO2 laser, using SF6 as a sensitizer, while amplification was detected using an étalon-tuned pulsed dye laser probe and a sensitive cavity ringdown technique. The magnitude of the peak gain, estimated at 3.6×10−4/cm, was consistent with a negligible concentration of the terminal BiF(X, v″=4) state, based on the calculated optical cross section and the peak concentration of the BiF (A, v′=1) state, as measured by absolute photometry.