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Applied Physics B

Superradiant transitions between high-lying levels of Sr in an external electric field

T. Becker, R.-H. Rinkleff, A. Steudel

Published Sep 1, 1989• 7 citations
Publisher
DOI
10.1007/bf00714644

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The occurrence of superfluorescence in the near-infrared regime has been investigated between high-lying levels of Sr, Ba, and Na under the influence of a static homogeneous external electric field. The time inequalities for single-pulse superfluorescence were fulfilled. The measurements show for all the investigated superfluorescent transitions that the square root of the peak intensity of the superfluorescent pulse decreases with the square of the electric-field strength. If one takes into account the dependence of the number of excited atoms, the wavelengths, and the line strengths of the superfluorescent pulses on the electric-field strengths, the experimental findings cannot be explained by well-known theories of superfluorescence.
Collective emission in a resonant cavity was observed between high-lying levels in Sr and Ba. These transitions react very sensitively to a static external electric field. The square root of the maximum of the intensity of the superfluorescent pulse decreases linearly with the second power of the electric field strength. The behavior of the maximum of the intensity, of the characteristic superfluorescent time, and of the delay time of the superfluorescent pulse was described in the framework of modified Maxwell-Bloch equations and explained by a change of the characteristic time constant of the superfluorescent pulse.