The correlation spectroscopy has been successfully employed in the measurement of the intrinsic linewidth of electromagnetically induced transparency (EIT) in time and frequency domain. We study the role of the sidebands of the intense fields in the measured spectra, analyzing the information that can be recovered working with different analysis frequencies. In this case, the non-zero one-photon detuning appears as a necessary condition for spectrally resolving the sideband resonances in the correlation coefficient. Our experimental findings are supported by the perturbative model defined in the frequency domain. arXiv:1508.04858v1 [quant-ph]
Enhanced sensitivity in electromagnetically induced transparency (EIT) can be obtained by the use of noise correlation spectroscopy between the fields involved in the process. Here, we investigate EIT in a cold (< 1 mK) rubidium vapor and demonstrate sensitivity to detect weak light-induced forces on the atoms. A theoretical model is developed and shows good agreement with our measurements, enabling the attribution of the observed effects to the coupling of the atomic states to their motion. The effects remain unnoticed on the measurement of the mean fields but are clearly manifest in their correlations.
A significant comparison based on full nonlinear simulations and experimental results of two DPAs implementing respectively a TL and a Class F configurations, has been presented. The expected 15% (roughly) improvement in output power and drain efficiency when using a Class F configuration with respect its TL counterparts has been experimentally demonstrated. REFERENCES 1. W.H. Doherty, A new high efficiency power amplifier for modulated waves,
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