RESUMO
We theoretically investigate the dynamic regime of coherent population trapping (CPT) in the presence of frequency modulation (FM). We have formulated the criteria for quasi-stationary (adiabatic) and dynamic (non-adiabatic) responses of atomic system driven by this FM. Using the density matrix formalism for Λ system, the error signal is exactly calculated and optimized. It is shown that the optimal FM parameters correspond to the dynamic regime of atomic-field interaction, which significantly differs from conventional description of CPT resonances in the frame of quasi-stationary approach (under small modulation frequency). Obtained theoretical results are in good qualitative agreement with different experiments. Also we have found CPT-analogue of Pound-Driver-Hall regime of frequency stabilization.
RESUMO
Renal cell carcinoma can present as a variety of paraneoplastic, nonmetastatic conditions, including vasculitis. We describe a patient who presented with the polymyalgia rheumatica syndrome but did not respond to a trial of prednisone. An asymptomatic, nonmetastatic renal cell carcinoma was found during this patient's evaluation. Nephrectomy led to resolution of the systemic complaints. Malignancy, in this case, renal cell carcinoma, can present as polymyalgia rheumatica and resolve after surgical removal of the underlying tumor.
