26 September 1997 Time-delayed second-harmonic generation in atomic Cs vapor
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Proceedings Volume 3239, Photon Echo and Coherent Spectroscopy; (1997) https://doi.org/10.1117/12.287665
Event: PECS '97: Photon Echo and Coherent Spectroscopy, 1997, Yoshkar-Ola, Russian Federation
Time-delayed second harmonic generation has recently been reported in an atomic vapor of Cs at a temperature near 180 degrees Celsius and situated in a magnetic field of the order of a killogauss. Short 10 ps excitation laser pulses at 885 nm were used to excite a macroscopic electric quadrupole density which was then observed to radiate at 442 nm after a delay of a few hundred picoseconds. The experiment is complicated by the presence of several superfluorescence transitions some of which radiate close to the 442 nm wavelength. These emissions are also delayed and our strategy is to set the experimental conditions so that they only become appreciable after the second harmonic emission is complete. In this paper we show how the second harmonic develops by considering the evolution of the radiation pattern of an isolated atomic radiator (not forbidden to radiate at the second harmonic even in the absence of a magnetic field). We estimate the intensity of the superradiant second harmonic emission and obtain agreement with experiment. Excellent agreement is also obtained between measured and calculated delay.
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A. I. Lvovsky, A. I. Lvovsky, Sven R. Hartmann, Sven R. Hartmann, } "Time-delayed second-harmonic generation in atomic Cs vapor", Proc. SPIE 3239, Photon Echo and Coherent Spectroscopy, (26 September 1997); doi: 10.1117/12.287665; https://doi.org/10.1117/12.287665

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