https://doi.org/10.1140/epjd/s10053-022-00431-5
Regular Article - Atomic Physics
Effect of detuning on velocity-induced population oscillation
Department of Physics, Indian Institute of Technology Guwahati, 781039, Guwahati, Assam, India
Received:
28
April
2022
Accepted:
6
June
2022
Published online:
19
July
2022
We report an experimental study on the effect of detuning on velocity-induced population oscillation (VIPO) for a Doppler mismatched double resonance. The double resonance experiment is conducted on 
transition (at 780 nm) and 
transition (at 421 nm) in 
at room temperature. The method measures the shift of the VIPO dip from the line center of the transparency or enhanced absorption (EA) peaks caused by the lock offset point of the resonantly driving laser, i.e., the IR laser in our case. The shift in the VIPO dip with IR laser detuning is nonlinear but symmetrical and the width of the line profile for the VIPO dip height with IR laser detuning is sub-natural. We subsequently utilized the effect to precisely determine the locking point of the IR laser on the 
transition in the double resonance configurations with an uncertainty of around 100 kHz. The experimental result is well supported by numerical simulation using the density matrix calculations.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2022
