Interference Between The 5d5/2 – 5p3/2 And 5p3/2 – 5s1/2 Coherences (386.4 And 384.1 Thz) In Rb Observed By Ultrafast Four-wave Mixing Spectroscopy
Reboli, Thomas
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https://hdl.handle.net/2142/116888
Description
Title
Interference Between The 5d5/2 – 5p3/2 And 5p3/2 – 5s1/2 Coherences (386.4 And 384.1 Thz) In Rb Observed By Ultrafast Four-wave Mixing Spectroscopy
Author(s)
Reboli, Thomas
Contributor(s)
Eden, J. Gary
Issue Date
2022-06-23
Keyword(s)
Instrument/Technique Demonstration
Abstract
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Coherences at 386.2 THz and 384.1 THz, corresponding to the 5d$_{5/2}$ – 5p$_{3/2}$ and 5p$_{3/2}$ – 5s$_{1/2}$ difference frequencies, respectively, have been established in the Rb atom during pump-probe experiments involving pairs of identical ~150 fs pulses produced by a Ti:\chem{Al_2O_3} laser and a Michelson interferometer. The interference between the two coherences within the atom is observed through a parametric four-wave mixing process in Rb and detection of the signal wave intensity at 420 nm. Scanning the time delay between the pump and probe pulses over a 600 ps interval produces a sampling rate over 300 THz and allows for a spectral domain resolution of 0.05 cm$^{-1}$ to be achieved. The figure at right shows several spectra recorded near 2.1 THz, the (5d$_{5/2}$ – 5p$_{3/2}$) - (5p$_{3/2}$ – 5s$_{1/2}$) difference frequency, with varying angle between the pump and probe pulses (i.e., the phase matching angle) and varying Rb background density. A Fano interference window is clearly observed, and analysis of these and similar spectra demonstrates that the amplitude and phase of the coherently-coupled, three Rb state system can be controlled precisely.
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