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Collision-induced phase in macroscopic optical coherence

P. J. Laverty, A. M. Bacon, J. E. Thomas

Recently, we have developed new techniques to study collision induced phase in macroscopic optical coherence for the first time1,2. These techniques have been used to study the imaginary part of the collision‐induced velocity change distribution for 174Yb two level optical radiators in vapors. The results provide complimentary information to the real part of the velocity change distribution measured via the intensity of optical transients3. As a result of these studies, a number of new and quite unexpected features have emerged. These include the observations that the imaginary part of velocity change distribution appears to lack a diffractive component in contrast to the real part which is predominantly diffractive. Further, the imaginary part exhibits relatively large angle scattering, about ten times the diffractive width. In this scattering angle region, the optical coherence scatters through angles which are large compared to diffraction angles yet too small for the stationary phase approximation to the scattering amplitude (i.e., classical scattering) to be valid. Hence, the experiments probe the interesting region where the transition from quantum to classical scattering occurs.Recently, we have developed new techniques to study collision induced phase in macroscopic optical coherence for the first time1,2. These techniques have been used to study the imaginary part of the collision‐induced velocity change distribution for 174Yb two level optical radiators in vapors. The results provide complimentary information to the real part of the velocity change distribution measured via the intensity of optical transients3. As a result of these studies, a number of new and quite unexpected features have emerged. These include the observations that the imaginary part of velocity change distribution appears to lack a diffractive component in contrast to the real part which is predominantly diffractive. Further, the imaginary part exhibits relatively large angle scattering, about ten times the diffractive width. In this scattering angle region, the optical coherence scatters through angles which are large compared to diffraction angles yet too small for the stationary phase approximation to the scattering amplitude (i.e., classical scattering) to be valid. Hence, the experiments probe the interesting region where the transition from quantum to classical scattering occurs.

AIP conference proceedingsJan 1, 19900 citations

Time Dependent Optical Phase and Imaginary Collision Kernels

J. E. Thomas, P. J. Laverty, K. D. Stokes

Laser SpectroscopyJan 1, 19891 citation

Time-dependent optical phase and imaginary collision kernels

John E. Thomas, P. J. Laverty, K. D. Stokes

Recently demonstrated techniques for measuring collision-induced phase in macroscopic optical coherence are described and analyzed in detail. The time-dependent phase measured by this method is used to study imaginary collision kernels for optical radiators that are related to the phase by Fourier transformation. The results indicate that classical velocity changes may make an important contribution to the imaginary kernel, in contrast to the real kernel, which is dominated by diffractive velocity changes.Recently demonstrated techniques for measuring collision-induced phase in macroscopic optical coherence are described and analyzed in detail. The time-dependent phase measured by this method is used to study imaginary collision kernels for optical radiators that are related to the phase by Fourier transformation. The results indicate that classical velocity changes may make an important contribution to the imaginary kernel, in contrast to the real kernel, which is dominated by diffractive velocity changes.

Physical Review AAug 1, 19890 citations

Collision-Induced Optical Coherence Transfer Studied by Velocity Space Interferometry.

P. J. Laverty, A. M. Bacon, J. E. Thomas

Quantum Electronics and Laser Science ConferenceMay 12, 19910 citations

Collision-induced coherence transfer studied by tunable energy compensation

John E. Thomas, J. M. Liang, Ramachandra Rao Dasari

Collision-induced coherence transfer between infrared molecular transitions is studied using a technique that permits the complete distribution of accompanying velocity changes to be determined in a simple way. The experiments are carried out by measuring the intensity of two pulse photon echoes as a function of applied Stark field at fixed large echo time delay. The velocity change distribution for coherence-transfer collisions is obtained directly as the shape of the echo intensity versus Stark field curve. Previously unpublished data for dipole-quadrupole and van der Waals interactions are presented, and a theory of coherence-transfer velocity-changing kernels is developed that is in good agreement with the data.Collision-induced coherence transfer between infrared molecular transitions is studied using a technique that permits the complete distribution of accompanying velocity changes to be determined in a simple way. The experiments are carried out by measuring the intensity of two pulse photon echoes as a function of applied Stark field at fixed large echo time delay. The velocity change distribution for coherence-transfer collisions is obtained directly as the shape of the echo intensity versus Stark field curve. Previously unpublished data for dipole-quadrupole and van der Waals interactions are presented, and a theory of coherence-transfer velocity-changing kernels is developed that is in good agreement with the data.

Physical Review AAug 1, 19905 citations

Collision-Induced Coherences in Optical Physics

G. S. Agarwal

Advances in atomic, molecular, and optical physicsJan 1, 199110 citations

Collision-induced optical phase

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Collision-induced optical phase

Abstract

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