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Observation of Higher-Order Dephasing-Induced Coherences in a Flame in a Magnetic Field

Rick P. Trebino, Larry A. Rahn

Published Jul 18, 1988• 1 citation
OpenAlex

Abstract

Dephasieg-induced phenomena are a novel class of effects that are ordinarily forbidden because the two or more relevant quantum-mechanical amplitudes add coherently and cancel out.1 When dephasing is present, however, these amplitudes no longer cancel, and previously unseen effects can be observed. Indeed, a number of novel dephasing-induced phenomena have been seen.2-5 Of particular interest, both for fundamental reasons and for diagnostic purposes, are (third-order) dephasing-induced resonances between equally populated levels of a ground electronic state,6,7 specifically, Zeeman and hyperfine coherences. Working with a sodium-seeded flame, we8 have observed these latter effects and, at higher intensities, subharmonics of them.

Related papers

Dephasing-induced coherences: higher-order selection rules and experiments in a magnetic field

Larry A. Rahn, Rick P. Trebino

We observe dephasing‐induced third‐and higher‐order wave‐mixing spectra of Zeeman and hyperfine coherences in a sodium‐seeded flame in a magnetic field. As the perturbation parameter approaches unity, we compare our experimental spectra with theoretical higher‐order selection rules.

AIP conference proceedings•Jan 1, 1988•0 citations

Observation of long-lived collision-induced coherences and ground-state-spin gratings in a flame

Rick P. Trebino, Larry A. Rahn

We observe collision‐induced four‐wave‐mixing resonances—Zeeman and hyperfine coherences and ground‐state‐spin gratings—in a sodium‐seeded hydrogen‐air flame. We see several new characteristics of collision‐induced phenomena at high intensity.

AIP conference proceedings•Jan 1, 1987•1 citation

Higher-order collision enhanced wave mixing; theory and experiment

Rick P. Trebino, Larry A. Rahn

Collision enhanced resonances represent an interesting class of nonlinear-optical processes. They occur because collisional dephasing can rephase quantum mechanical amplitudes that ordinarily cancel out exactly, thereby allowing otherwise unobservable wave-mixing resonances to be seen. This is an especially interesting phenomenon because these resonances are coherent effects that are induced by an incoherent process (collisional dephasing). First predicted1 in the late 1970s and eventually observed2 in 1981, these novel effects have now been seen in a wide variety of four-wave-mixing experiments, ranging from self-focusing to coherent anti-Stokes Raman spectroscopy.

Quantum Electronics and Laser Science Conference•Apr 24, 1989•0 citations

Collision-induced six-wave-mixing and subharmonic resonances: experiments in a sodium-seeded flame

Rick P. Trebino, Larry A. Rahn

•Apr 26, 1987•1 citation

Subharmonic resonances in higher-order collision-enhanced wave mixing in a sodium-seeded flame

Rick P. Trebino, Larry A. Rahn

Using four-, six-, and eight-wave-mixing geometries, we observe subharmonic resonances in collision-enhanced spectra in a sodium-seeded hydrogen-air flame. Appearing at high intensity, these resonances occur at +/-1/2, +/-1/3, +/-1/4, and +/-1/5 times the frequency of the ground-state hyperfine splitting omega(hfs). We argue that these resonances result from higher-order processes, specifically chi((n)), where n >/= 5. In particular, to describe the resonances at +/-omega(hfs)/5, at least chi((13)) is required. These high-order collision-enhanced effects are true perturbative nonlinearities and not sequential four-wave mixing processes.

Optics Letters•Nov 1, 1987•46 citations

Observation of collision-induced coherence and ground-state spin gratings in a flame (A)

Larry A. Rahn, Rick P. Trebino

Journal of the Optical Society of America B•Jan 1, 1987•0 citations
Dephasieg-induced phenomena are a novel class of effects that are ordinarily forbidden because the two or more relevant quantum-mechanical amplitudes add coherently and cancel out.1 When dephasing is present, however, these amplitudes no longer cancel, and previously unseen effects can be observed. Indeed, a number of novel dephasing-induced phenomena have been seen.2-5 Of particular interest, both for fundamental reasons and for diagnostic purposes, are (third-order) dephasing-induced resonances between equally populated levels of a ground electronic state,6,7 specifically, Zeeman and hyperfine coherences. Working with a sodium-seeded flame, we8 have observed these latter effects and, at higher intensities, subharmonics of them.
Collision enhanced resonances represent an interesting class of nonlinear-optical processes. They occur because collisional dephasing can rephase quantum mechanical amplitudes that ordinarily cancel out exactly, thereby allowing otherwise unobservable wave-mixing resonances to be seen. This is an especially interesting phenomenon because these resonances are coherent effects that are induced by an incoherent process (collisional dephasing). First predicted1 in the late 1970s and eventually observed2 in 1981, these novel effects have now been seen in a wide variety of four-wave-mixing experiments, ranging from self-focusing to coherent anti-Stokes Raman spectroscopy.
Using four-, six-, and eight-wave-mixing geometries, we observe subharmonic resonances in collision-enhanced spectra in a sodium-seeded hydrogen-air flame. Appearing at high intensity, these resonances occur at +/-1/2, +/-1/3, +/-1/4, and +/-1/5 times the frequency of the ground-state hyperfine splitting omega(hfs). We argue that these resonances result from higher-order processes, specifically chi((n)), where n >/= 5. In particular, to describe the resonances at +/-omega(hfs)/5, at least chi((13)) is required. These high-order collision-enhanced effects are true perturbative nonlinearities and not sequential four-wave mixing processes.