Cooperative cascade emission

Okada, Jutaro; Ikeda, Kensuke S.; Matsuoka, Makoto

doi:10.1016/0030-4018(78)90050-0

Cited by 42 publications

(11 citation statements)

References 7 publications

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“…In the linear approximation [22], nonlinear terms bc ρ ab and ab ρ bc are neglected; thus, ρ ac (t) ρ ac (0). Similarly, as found in [15,17,22], the Rabi frequencies are given by 4), we infer the characteristic exponential growth [22] of the emissions on both the upper (ab) and lower (bc) transitions (i.e., both the 5 µm and 420 nm pulses are SF emissions [17]). The growth rate does depend solely on the main parameter ξ leading to yoked SF [17].…”

Section: A Yoked Superfluorescencesupporting

confidence: 73%

“…SF involving cascade three-level atoms is called cooperative cascade emission. Both the theory and related experiment were first reported by Okada et al [15]. The time development of cooperative cascade emission was also studied by using a streak camera with about 10 ps resolution [16].…”

Section: Introductionmentioning

confidence: 91%

“…Assuming that the backward 5 µm SF is uncoupled from the forward 5 µm and forward 420 nm SF, the Maxwell equations for two copropagating modes in the retarded time frame t → t − z/c, are given by [15,17,22] …”

Section: A Yoked Superfluorescencementioning

confidence: 99%

“…In this case, the initial populations of the upper and lower states are the control parameters rather than input pump power. This model of copropagating modes for cascade three-level atoms has been studied in [15,22] where the backward propagating mode is assumed to be generated independently. The reduced equation of motion for three-level atoms can be obtained from the five-level case by eliminating levels |b 1 and |b 2 .…”

Section: A Yoked Superfluorescencementioning

confidence: 99%

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Observation of picosecond superfluorescent pulses in rubidium atomic vapor pumped by 100-fs laser pulses

et al. 2010

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We study the superfluorescence (SF) from a gas of rubidium atoms. The atoms of a dense vapor are excited to the 5D state from the 5S state by a two-photon process driven by 100-fs laser pulses. The atoms decay to the 6P state and then to the 5S state. The SF emission at 420 nm on the 6P -5S transition is recorded by a streak camera with picosecond time resolution. The time duration of the generated SF is tens of picoseconds, which is much shorter than the time scale of the usual relaxation processes, including spontaneous emission and atomic coherence dephasing. The dependence of the time delay between the reference input pulse and SF is measured as a function of laser power. The experimental data are described quantitatively by a simulation based on the semiclassical atom-field interaction theory. The observed change in scaling laws for the peak intensity and delay time can be elucidated by an SF theory in which the sample length is larger than the cooperation length.

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Section: A Yoked Superfluorescencesupporting

confidence: 73%

Section: Introductionmentioning

confidence: 91%

Section: A Yoked Superfluorescencementioning

confidence: 99%

Section: A Yoked Superfluorescencementioning

confidence: 99%

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Observation of picosecond superfluorescent pulses in rubidium atomic vapor pumped by 100-fs laser pulses

et al. 2010

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“…is different, the equations coupling the normalized fields E1 and the density matrix elements p(= )(JI) can be written as: = [1] aEba 2SIPba [2] [7] aaPa = -(E Pba Pab E) [8] Here Fj is the reduced homogeneous dephasing rate. The superradiant lifetime associated with the upper optical transition at complete inversion is tR = T(2 kj, I itN L) where Tis the spontaneous lifetime associated with the cb transition, N is the atomic density and L is the sample length.…”

Section: Max Well-bloch Equationsmentioning

confidence: 99%

<title>Scale symmetry breaking in a coherently excited cascade amplifier</title>

Manassah

Gross

1994

SPIE Proceedings

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We analyse the temporal development of a seed signal propagating in an ensemble of three-level atoms initially pumped by a two-photon excitation pulse. In an incoherently prepared system, the medium acts as a two-level system. Such a system is scale-invariant and therefore its dynamics is uniquely determined by the value of aL. On the other hand, a coherently prepared system is not scale invariant leading to more complicated dynamics. We show that, at low optical gain, the amplification is reduced when the pumping is coherent. We further show that at high inversion there is an exponential increase in the radiation emitted from the lower transition in an initially prepared coherent system.

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Superfluorescence/Superradiance in Helium Following Free-Electron Laser Excitation

Harries

Kuma

Iwayama³

et al. 2018

Springer Proceedings in Physics

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Cooperative cascade emission

Cited by 42 publications

References 7 publications

Observation of picosecond superfluorescent pulses in rubidium atomic vapor pumped by 100-fs laser pulses

Observation of picosecond superfluorescent pulses in rubidium atomic vapor pumped by 100-fs laser pulses

<title>Scale symmetry breaking in a coherently excited cascade amplifier</title>

Superfluorescence/Superradiance in Helium Following Free-Electron Laser Excitation

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