Beating in Rubidium at 21 THz and 182 THz LongRange Rb Rb Interactions WILLIAM GOLDSHLAG BRIAN J RICCONI J GARY EDEN Laboratory for Optical Physics and Engineering Department of Electrical and Computer Engineering ID: 626745
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Observation of Quantum Beating in Rubidium at 2.1 THz and 18.2 THz:Long-Range Rb*-Rb Interactions.
WILLIAM GOLDSHLAG, BRIAN J. RICCONI, J. GARY EDENLaboratory for Optical Physics and Engineering,Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA.2017-06-20Slide2
Overview
Quantum beating has been observed at frequencies up to 55 THz. Interaction between 7s-5d
and 8s-6d wave packets is observed.A new tool for probing Rb*-Rb* interactions at long range (100-1000Å).2Slide3
Quantum Beat Spectroscopy
3Slide4
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Excitation of
Atomic Wave Packets in Rubidium
Spectrum of
coherent excitation source
5d
7sSlide5
Oven
Schematic Diagram of the Experimental Layout
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55 fs Ti:Al
2
O
3
laser
Beam
profiler
Laser
pump
p
ower
Quantum
beating
intensity
50/50
50/50
Delay
stage
dichroic
mirror
ΔTSlide6
Quantum Beating in Time Domain
6Slide7
7
Strong Quantum Beats in Time Domain
Energy levels of Rb producing strongestquantum beatingSlide8
Spectral Intensity of
6p Emission to Ground (420 nm)8Slide9
Spectral
Lines Attributed to Wave Packet Interactions9Slide10
Optical Process Generating the 18.225 THz Quantum Beating
10Slide11
Optical Process Generating the
2.107 THz Quantum Beating11Slide12
Optical Process Generating the
10.73 THz Quantum Beating12Slide13
Spectral Lines Attributed to Wave Packet Interactions
13Slide14
Perspective View of a Spectrogram
14Slide15
Perspective View of a Spectrogram
15Slide16
7s-5d
8s-6d
“5s-p-d”Temporal Behavior of Main Quantum Beating Lines16
Energy levels of Rb comprising the wave packets.
Time delay between pulses, ps.
Plots are not to scale.Slide17
Temporal
Behavior of Main Quantum Beating Lines17
7s-5d2x (7s-5d)Time delay between pulses, ps.Plots are not to scale.
Energy levels of Rb comprising
the wave packets.Slide18
Summary
Observed quantum beating in rubidium at frequencies up to 55 THz using
parametric four-wave mixing.Multiple wave packets were simultaneously observed, and they appear to be trading energy.
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The wave packets allow us to look into long-range interactions of rubidium atoms, making quantum beat spectroscopy a new tool for studying molecular interactions.