2013
DOI: 10.1103/physrevx.3.041001
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Quantum Amplification by Superradiant Emission of Radiation

Abstract: A laser generates light through stimulated emission of radiation and requires population inversion. Quantum interference can yield lasing without inversion. However, such phase-sensitive quantum amplification still requires some atomic population in the excited state. Here, we present a new kind of quantum amplifier based on collective superradiant emission which does not need any population in the excited state. We show that parametric resonance between the driving (e.g., infrared) field and collective superr… Show more

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Cited by 68 publications
(106 citation statements)
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“…1). The pulses were loosely focused to obtain an intensity of ~10 15 W/cm 2 . The HHG source consisted of two independent gas jets: the harmonics generated in the first gas jet in the form of an attosecond pulse train served as the XUV seed, and the second gas jet served as XUV amplifier.…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…1). The pulses were loosely focused to obtain an intensity of ~10 15 W/cm 2 . The HHG source consisted of two independent gas jets: the harmonics generated in the first gas jet in the form of an attosecond pulse train served as the XUV seed, and the second gas jet served as XUV amplifier.…”
Section: Methodsmentioning
confidence: 99%
“…Such nonlinear interactions, as X-ray parametric amplification (XPA), can cause amplification of the XUV pulse in the gas medium. Both nonlinear enhanced ionization and stimulated amplification have been theoretically studied, namely, a XUV seed pulse was shown to produce new harmonic lines [14], and it was shown to be amplified by backward scattering [15] or forward scattering [16][17][18][19][20]. Parametric amplification processes have been recently measured and described also by perturbative highorder parametric interaction [21] and by ab initio simulations in hydrogen molecular ions [22].…”
Section: Introductionmentioning
confidence: 99%
“…However, the dipole-dipole interaction is long range and cooperative behaviour can still exist for spacings much larger than a wavelength. This similarity between cavities and cooperative ensembles has the potential for realising cavity phenomena without the need of a cavity, for example cavity-free lasing [31].…”
Section: Chapter 1 Introductionmentioning
confidence: 99%
“…In a recent proposal by Svidzinsky et al [11], a semiclassical approach was used to show that JaynesCummings interaction could lead to strong amplification of light in a superradiant atomic gas, if such a coupled system is driven with an external difference-frequency pump. This quickly leads to the conceptual difficulty that energy conservation is violated.…”
mentioning
confidence: 99%
“…In addition, we remark that Eq. (2) is the diagonalized representation for all parametrically coupled systems, including the cases discussed in reference [11,[21][22][23]. Given the pump field E p (t) = A 0 cos (νt + φ), the coupled equations can be transformed with the complex notation E = (Ẽ +Ẽ * )/2 and rotating-wave framẽ E(t) =Ẽ(t)e −iωt to FIG.…”
mentioning
confidence: 99%