1.
Phys Rev Lett
; 123(10): 103601, 2019 Sep 06.
Artigo
em Inglês
| MEDLINE
| ID: mdl-31573286
RESUMO
Cold samples of calcium atoms are prepared in the metastable ^{3}P_{1} state inside an optical cavity resonant with the narrow band (375 Hz) ^{1}S_{0}â^{3}P_{1} intercombination line at 657 nm. We observe a superradiant emission of hyperbolic secant shaped pulses into the cavity with an intensity proportional to the square of the atom number, a duration much shorter than the natural lifetime of the ^{3}P_{1} state, and a delay time fluctuating from shot to shot in excellent agreement with theoretical predictions. Our incoherent pumping scheme to produce inversion on the ^{1}S_{0}â^{3}P_{1} transition should be extendable to allow for continuous wave laser operation.