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PSDs, bandwidths and coherence times, for fields with exponential and Gaussian correlations

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posted on 13.08.2013, 00:00 by G M Nikolopoulos, P Lambropoulos

Table 1. PSDs, bandwidths and coherence times, for fields with exponential and Gaussian correlations.

Abstract

Motivated by recent experiments pertaining to the interaction of weak SASE-free-electron-laser (FEL) pulses with atoms and molecules, we investigate the conditions under which such interactions can be described in the framework of a simple phase-diffusion model with decorrelated atom–field dynamics. The nature of the fluctuations that are inevitably present in SASE-FEL pulses is shown to play a pivotal role in the success of the decorrelation. Our analysis is performed in connection with specific recent experimental results from FLASH in the soft x-ray regime.

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