Articles written in Pramana – Journal of Physics
Volume 78 Issue 4 April 2012 pp 585-594 Research Articles
The magnetically modulated saturation absorption proﬁle is studied for a wide range of external DC magnetic ﬁeld. The salient features of Doppler-free signal generated by laser frequency modulation and atomic energy level modulation are compared. The DC offset of the signal proﬁle is found to be unstable as the external DC magnetic ﬁeld is changed. The technical difﬁculty of tuning laser frequency under locked condition over a large frequency span is discussed along with possible solutions.
Volume 82 Issue 2 February 2014 pp 301-306 Contributed Papers
We have investigated coherent population trapping (CPT) in laser-cooled as well as room-temperature (with and without buffer gas) rubidium atoms. The characteristic broad signal profile emerging from the two-photon Raman resonance for room-temperature atomic vapour is consistent with the theoretical calculation incorporating associated thermal averaging. The spectral width of the dark resonance obtained with cold atoms is found to be broadened, compared to roomtemperature vapour cell, due to the feeble role played by thermal averaging, although the cold atomic sample significantly overcomes the limitation of the transit time broadening. An alternative way to improve transit time is to use a buffer gas, with which we demonstrate that the coherent population trapping signal width is reduced to < 540 Hz.
Volume 93 | Issue 6
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