Observation of Quantum Beating in Rubidium at 2. 1 THz and 18

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Observation of Quantum Beating in Rubidium at 2. 1 THz and 18 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 EDEN Laboratory for Optical Physics and Engineering, Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA. 2017-06-20

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).

Quantum Beat Spectroscopy

Excitation of Atomic Wave Packets in Rubidium Spectrum of coherent excitation source 5d 7s E:\ToBigSpore\Illinois\Research\QuantumBeating\Physical_Quantities_and_Conversions\Energy_levels\Rb_EnergyLevels_HighVisibility\Rb_2photon_excitations_and_relaxations_andPumpOverlap.png

Schematic Diagram of the Experimental Layout 55 fs Ti:Al2O3 laser 50/50 ΔT dichroic mirror 50/50 Oven Quantum beating intensity Delay stage Beam profiler Laser pump power

Quantum Beating in Time Domain 17-02-28-Strong182_quantumBeats-200C\02-01-TimeD4.png 17-02-28-Strong182_quantumBeats-200C\02-01-03-TimeD-zoomX-coherentTransient2-4.png

Strong Quantum Beats in Time Domain 02-01-04-TimeD-zoomX-individualBeats_around5ps-datapoints-font16.png QuantumBeating\Physical_Quantities_and_Conversions\Energy_levels\Rb_EnergyLevels_HighVisibility\Rb_quantum_beat_stateGroups-mainTwo.png Energy levels of Rb producing strongest quantum beating

Spectral Intensity of 6p Emission to Ground (420 nm) Illinois\Research\QuantumBeating\17-03-02-Strong182_quantumBeats-170C\03-02-12-FrequencyD-60THz-hiPass0d25THz-harmonicsAround_36.45THz-noLabels.png

Spectral Lines Attributed to Wave Packet Interactions Illinois\Research\QuantumBeating\17-03-02-Strong182_quantumBeats-170C\003-02-12-FrequencyD-zoomY-peakAssignments-60THz-wProcesses-primaryLabels.png

Optical Process Generating the 18.225 THz Quantum Beating Illinois\Research\QuantumBeating\17-03-02-Strong182_quantumBeats-170C\03-02-12-FrequencyD-zoomY-peakAssignments-60THz-wProcesses-18d2-2.png

Optical Process Generating the 2.107 THz Quantum Beating Illinois\Research\QuantumBeating\17-03-02-Strong182_quantumBeats-170C\03-02-12-FrequencyD-zoomY-peakAssignments-60THz-wProcesses-2d1-2.png

Optical Process Generating the 10.73 THz Quantum Beating Illinois\Research\QuantumBeating\17-03-02-Strong182_quantumBeats-170C\03-02-12-FrequencyD-zoomY-peakAssignments-60THz-wProcesses-10d73-2.png

Spectral Lines Attributed to Wave Packet Interactions Illinois\Research\QuantumBeating\17-03-02-Strong182_quantumBeats-170C\03-02-12-FrequencyD-60THz-hiPass0d25THz-peakAssignments.png

Perspective View of a Spectrogram

Perspective View of a Spectrogram

Temporal Behavior of Main Quantum Beating Lines 7s-5d 8s-6d “5s-p-d” Plots are not to scale. Illinois\Research\QuantumBeating\17-02-28-Strong182_quantumBeats-200C\02-130-07-02-spectralLinePowerDensityEvolution_18d2_vs_10d7-noLegend.png Illinois\Research\QuantumBeating\Physical_Quantities_and_Conversions\Energy_levels\Rb_EnergyLevels_HighVisibility\Rb_quantum_beat_stateGroups-mainThree.png Energy levels of Rb comprising the wave packets. Time delay between pulses, ps.

Temporal Behavior of Main Quantum Beating Lines Plots are not to scale. 7s-5d Illinois\Research\QuantumBeating\17-02-28-Strong182_quantumBeats-200C\02-130-01-03-spectralLinePowerDensity_18d2_1st_vs_2nd_harmonics-noLegend.png Illinois\Research\QuantumBeating\Physical_Quantities_and_Conversions\Energy_levels\Rb_EnergyLevels_HighVisibility\Rb_quantum_beat_stateGroups-harmonics_of_18d2.png 2x (7s-5d) Energy levels of Rb comprising the wave packets. Time delay between pulses, ps.

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. 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.