Nonlinear spectroscopy in an intense Markov field

Oseledchik, Yu. S.; Burshteǐn, A. I.

doi:10.1007/bf01033699

Cited by 4 publications

(2 citation statements)

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“…This is similar to observations that the temporal resolution of a nonlinear optical process with chaotic light is determined by the temporal coherence time, rather than the pulse duration, if the temporal, longitudinal, coherence time is smaller than typical relaxation processes or typical time constant in the system [42][43][44]. Increasing the pulse duration of the SASE pulses, the spectral coherence can be further decreased, resulting in a narrowing of the emission lines and an increased spectral resolution.…”

Section: High Resolution By Covariance Analysissupporting

confidence: 59%

Stimulated resonant x-ray Raman scattering with incoherent radiation

Weninger

Rohringer

2013

Phys. Rev. A

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We present a theoretical study on stimulated electronic Raman scattering in neon by resonant excitation with an x-ray free electron laser (XFEL). This study is in support of the recent experimental demonstration [C. Weninger et al., Phys. Rev. Lett. (to be published)] of stimulated x-ray Raman scattering. Focusing the broadband XFEL pulses into a cell of neon gas at atmospheric pressure a strong inelastic x-ray scattering signal in the forward direction was observed, as the x-ray energy was varied across the region of core-excited Rydberg states and the K edge. The broadband and intrinsically incoherent x-ray pulses from the XFEL lead to a rich, structured line shape of the scattered radiation. We present a generalized Maxwell-Liouville-von Neumann approach to self-consistently solve for the amplification of the scattered radiation along with the time evolution of the density matrix of the atomic and residual ionic system. An in-depth analysis of the evolution of the emission spectra as a function of the Raman gain is presented. Furthermore, we propose the use of statistical methods to obtain high-resolution scattering data beyond the lifetime broadening despite pumping with incoherent x-ray pulses.

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Section: High Resolution By Covariance Analysissupporting

confidence: 59%

Stimulated resonant x-ray Raman scattering with incoherent radiation

Weninger

Rohringer

2013

Phys. Rev. A

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“…Similar changes of emission spectra due to stochastic fields have been studied in resonance fluorescence with intensity and phase fluctuating optical laser pulses [28][29][30][31][32], or in the ac Stark effect in resonantly driven three-level systems [33]. A good collection of references on systems resonantly driven by stochastic fields can be found in [34].…”

Section: B Sase Pulses Of Limited Temporal Coherencementioning

confidence: 81%

Strongly driven resonant Auger effect treated by an open-quantum-system approach

Rohringer

Santra

2012

Phys. Rev. A

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We present theoretical studies of a two-step resonant Auger process at high x-ray intensity. Tuning a short x-ray pulse to the initially closed resonant channel of the 1s-2p transition in singly ionized neon, the initially neutral neon target is valence ionized. Subsequently, the strong resonant x-ray field transfers an inner-shell electron to the created outer valence vacancy, thereby creating a core-excited state. The strong resonant coupling, giving rise to Rabi oscillations involving a core transition, results in a modification of the resonant Auger-electron spectral line profile. If the valence photoelectron remains unobserved, the system of the residual ion undergoing the resonant Auger decay can be treated by an open quantum system approach. The resonant Auger-electron spectral line shape is shown to be determined by an analog of the reduced density matrix that depends on two time arguments. The equations of motion of this reduced density matrix are derived and numerical results are presented, in support of the recent experimental verification [E.

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