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Title:
Superfluorescence from optically trapped calcium atoms
Authors:
Kumarakrishnan, A.; Han, X. L.
Affiliation:
AA(Department of Physics, New York University, New York, New York 10003) AB(Department of Physics, Butler University, Indianapolis, Indiana 46208)
Publication:
Physical Review A, vol. 58, Issue 5, pp. 4153-4162 (PhRvA Homepage)
Publication Date:
11/1998
Origin:
APS
PACS Keywords:
Cooperative phenomena in quantum optical systems, Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption, Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency, Optical solitons; nonlinear guided waves
Abstract Copyright:
(c) 1998: The American Physical Society
DOI:
10.1103/PhysRevA.58.4153
Bibliographic Code:
1998PhRvA..58.4153K

Abstract

We have studied superfluorescence (SF) under highly unfavorable conditions of rapid collisional and radiative distribution in a Doppler-broadened medium. Nanosecond SF pulses at 5.5 μm were generated on the Ca 4s4p 1P1-3d4s 1D2 transition from a column of calcium vapor buffered with Ar by optically pumping the 4s2 1S0-4s4p 1P1 transition. The Rabi frequency associated with the intense pump pulse prevents the occurrence of SF while the pump laser is on. As a result, the predicted scaling laws that describe the properties of SF in a transversely excited system, such as peak heights, pulse widths, and delay times, are shown to apply in our situation in which the conditions resemble swept excitation. The delay times were found to be in agreement with a fully quantum mechanical calculation which describes the initiation of SF. Measurements of the densities of the three levels, the absolute SF photon yield, and the spatial distribution of the excited states indicate that the system has a quantum yield of unity. The SF intensity increases with an increase in Ar pressure due to collisional redistribution until the collisional dephasing rate inhibits SF. The conditions describing the transition of SF to amplified spontaneous emission allow us to measure the collisional broadening rate for the SF transition.
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