17 January 2011 Dark Hanle resonance narrowing by blocking the central part of the Gaussian laser beam
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Proceedings Volume 7747, 16th International School on Quantum Electronics: Laser Physics and Applications; 77470E (2011) https://doi.org/10.1117/12.882831
Event: XVI International School on Quantum Electronics: Laser Physics and Applications, 2010, Nessebar, Bulgaria
Abstract
We present Hanle electromagnetically induced transparency (EIT) resonances obtained from the outer parts of the Gaussian laser beam. The signal from the outer parts only was obtained by placing circular opaque masks of different diameters in the center of the laser beam just in front of the detector. The Hanle EIT resonances obtained in that way are narrower and for high laser intensities even more contrasted. Suggested explanation for the line narrowing is based on lower power broadening in the wings of the Gaussian laser beam as well as on the traversing of the coherently prepared atoms through the beam. The resonance contrast to linewidth ratio, when the central part of the beam is blocked, is higher or equal to the ratio obtained when the whole laser beam is detected, for all laser intensities used in the experiment. Due to high ratio of contrast and linewidth, resonances obtained in proposed way could be useful in frequency metrology and magnetometry.
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A. J Krmpot, A. J Krmpot, S. N. Nikoilić, S. N. Nikoilić, S. M. Ćuk, S. M. Ćuk, M. Radonjić, M. Radonjić, B. M. Jelenković, B. M. Jelenković, } "Dark Hanle resonance narrowing by blocking the central part of the Gaussian laser beam", Proc. SPIE 7747, 16th International School on Quantum Electronics: Laser Physics and Applications, 77470E (17 January 2011); doi: 10.1117/12.882831; https://doi.org/10.1117/12.882831
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