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Annual Report

Theoretical studies relating to the interaction of radiation with matter

P. R. Berman

Published Jun 1, 1993• 0 citations
OpenAlex

Abstract

During the past year, progress has been made in the areas of: (1) Coherent transients using counterpropagating fields; (2) New resonances in cold- atom spectroscopy; (3) Laser cooling in one dimension using linearly polarized fields; and, (4) Theory of four-wave mixing.... Laser spectroscopy, 4-wave mixing, Recoil-induced resonances, Laser cooling, Coherent transients, Grating echoes

Related papers

Interaction of Radiation with Matter: Atomic Collision Processes Occurring in the Presence of Radiation Fields

P. R. Berman

Abstract : Work is summarized in areas of: Laser Assisted Collisions; Velocity Changing collisions in Atomic Vapors; Coherent Transients; Collision Induced Extra Resonances; Breakdown of the Optical Bloch Equations; Saturation Spectroscopy; Dynamics of Two-and Three-level Atoms Interacting with Radiation Fields; Pulse Propagation. Keywords: Laser spectroscopy, Optical collisions, Radiative collisions, Two-level atom, Atomic coherence, Degenerate four-wave mixing, Saturation spectroscopy, Laser propagation,, Dressed atom, Photon echo, Bloch equations, Collision kernal, Collisions, Optical noise.

Annual Report•Sep 15, 1988•0 citations

Theoretical Studies Relating to the Interaction of Radiation with Matter: Atomic Collision Processes Occurring in the Presence of Radiation Fields

P. R. Berman

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Annual Report•Sep 1, 1981•0 citations

Recoil-induced resonances in nonlinear spectroscopy

Jingzhong Guo, P. R. Berman, B. Dubetsky +1 more

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Anantharaman Kumarakrishnan, S. B. Cahn, Unyob Shim +1 more

We have used two sets of orthogonally polarized traveling-wave pulses separated in time to establish and, subsequently, rephase a spatially periodic coherence grating between the magnetic sublevels of the $F=3$ ground state in a cloud of laser-cooled ${}^{85}\mathrm{Rb}$ atoms. The rephasing results in a magnetic grating echo (MGE). We have used the shape of the signals to determine both transverse and longitudinal velocity distributions and to study the effects of magnetic fields. The amplitude of the MGE with counterpropagating pulses is modulated at the atomic recoil frequency, a consequence of matter wave interference.

Physical Review A•Nov 1, 1998•20 citations

Properties and Interactions of Coherent Radiation.

L. Mandeļ

The research includes work on spatial coherence properties of lasers far below threshold, spectral broadening of the electromagnetic field near focus seen by a moving atom, plane wave representations and validity of semiclassical electromagnetic theories for treating the emission and absorption of light.

Final Report•Dec 1, 1974•0 citations

Forward four-wave mixing via recoil-induced resonances in cold cesium atoms

Álvaro Mitchell Galvão de Melo

Recoil-induced resonances (RIR) can be detected in experiments involving light-atom interaction where atomic external degrees of freedom play an important role. In pump-probe experiments the recoil of atoms due to absorption and emission of radiation is responsible for the amplification and attenuation of the probe beam under certain circumstances, resulting in a disperse and narrow (of the order of 10 kHz) feature in the spectrum of the probe beam. Backward four-wave mixing (BFWM) signals, via recoil-induced resonances, using cold atoms as nonlinear medium were also extensively studied during the past years. In this work it will be presented a systematic study of forward four-wave mixing (FFWM) via RIR. It will be also presented a simple theoretical model that allowed us to predict the lineshapes of the observed signals and to better understand the phenomenon studied. The model is also compared with results that are already known in order to verify its validity and predict the possibility of measure the velocity distribution of the atomic cloud in a future experiment.

•Dec 17, 2019•0 citations
During the past year, progress has been made in the areas of: (1) Coherent transients using counterpropagating fields; (2) New resonances in cold- atom spectroscopy; (3) Laser cooling in one dimension using linearly polarized fields; and, (4) Theory of four-wave mixing.... Laser spectroscopy, 4-wave mixing, Recoil-induced resonances, Laser cooling, Coherent transients, Grating echoes
Abstract : Work is summarized in areas of: Laser Assisted Collisions; Velocity Changing collisions in Atomic Vapors; Coherent Transients; Collision Induced Extra Resonances; Breakdown of the Optical Bloch Equations; Saturation Spectroscopy; Dynamics of Two-and Three-level Atoms Interacting with Radiation Fields; Pulse Propagation. Keywords: Laser spectroscopy, Optical collisions, Radiative collisions, Two-level atom, Atomic coherence, Degenerate four-wave mixing, Saturation spectroscopy, Laser propagation,, Dressed atom, Photon echo, Bloch equations, Collision kernal, Collisions, Optical noise.
It is shown that, as a result of the atomic recoil associated with the absorption and emission of radiation, resonances can appear in nonlinear spectroscopy. The theory is illustrated by calculating the line shapes associated with nearly degenerate four-wave mixing and pump-probe spectroscopy when laser fields interact with an ensemble of two-level atoms. The recoil-induced resonances should be observable for atoms cooled below the Doppler limit of laser cooling, and the line shapes may provide a means for measuring the velocity distribution of these cooled atoms.
We have used two sets of orthogonally polarized traveling-wave pulses separated in time to establish and, subsequently, rephase a spatially periodic coherence grating between the magnetic sublevels of the F=3F=3F=3 ground state in a cloud of laser-cooled 85Rb{}^{85}\mathrm{Rb}85Rb atoms. The rephasing results in a magnetic grating echo (MGE). We have used the shape of the signals to determine both transverse and longitudinal velocity distributions and to study the effects of magnetic fields. The amplitude of the MGE with counterpropagating pulses is modulated at the atomic recoil frequency, a consequence of matter wave interference.
Recoil-induced resonances (RIR) can be detected in experiments involving light-atom interaction where atomic external degrees of freedom play an important role. In pump-probe experiments the recoil of atoms due to absorption and emission of radiation is responsible for the amplification and attenuation of the probe beam under certain circumstances, resulting in a disperse and narrow (of the order of 10 kHz) feature in the spectrum of the probe beam. Backward four-wave mixing (BFWM) signals, via recoil-induced resonances, using cold atoms as nonlinear medium were also extensively studied during the past years. In this work it will be presented a systematic study of forward four-wave mixing (FFWM) via RIR. It will be also presented a simple theoretical model that allowed us to predict the lineshapes of the observed signals and to better understand the phenomenon studied. The model is also compared with results that are already known in order to verify its validity and predict the possibility of measure the velocity distribution of the atomic cloud in a future experiment.