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http://hdl.handle.net/2289/3980
Title: | Threshold nonlinear absorption in Zeeman transitions |
Authors: | Narayanan, Andal Hazra, Abheera Sandhya, S.N. |
Issue Date: | 12-Oct-2010 |
Publisher: | IOP Publishing Ltd. |
Citation: | Journal of Physics B, 2010, Vol.43, p215502 |
Abstract: | We experimentally study the absorption spectroscopy from a collection of gaseous 87Rb atoms at room temperature irradiated with three fields. Two of these fields are in a pump–probe saturation absorption configuration. The third field co-propagates with the pump field. The three fields address Zeeman degenerate transitions between hyperfine levels 5S1/2, F = 1 and 5P3/2, F = 0, F = 1 around the D2 line. We find a sub-natural absorption resonance in the counter-propagating probe field for equal detunings of all three fields. This absorption arises in conjunction with the appearance of increased transmission due to electro-magnetically induced transparency in the co-propagating fields. The novel feature of this absorption is its onset only for the blue of 5P3/2, F = 0, as the laser frequency is scanned through the excited states 5P3/2, F = 0, F = 1 and F = 2. The absorption rapidly rises to near maximum values within a narrow band of frequency near 5P3/2, F = 0. Our experimental results are compared with a dressed atom model. We find the threshold absorption to be a result of coherent interaction between the dressed states of our system. |
Description: | Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations) |
URI: | http://hdl.handle.net/2289/3980 |
ISSN: | 0953-4075 1361-6455 (Online) |
Alternative Location: | http://arxiv.org/abs/0906.5231 http://dx.doi.org/10.1088/0953-4075/43/21/215502 |
Copyright: | 2010 IOP Publishing Ltd. |
Appears in Collections: | Research Papers (LAMP) |
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