$A$ relativistic two-level model of a massive atom in the presence of an external plane-wave laser beam is solved. Using the resulting wave functions, the cross sections for the scattering of a photon of the laser frequency or one of its harmonics is calculated. Many interesting nonlinear effects are found, the most striking being the rapid change of the resonance frequency in the cross section for harmonic production as the intensity of the laser is increased. Both approximate and exact numerical results are presented.$A$ relativistic two-level model of a massive atom in the presence of an external plane-wave laser beam is solved. Using the resulting wave functions, the cross sections for the scattering of a photon of the laser frequency or one of its harmonics is calculated. Many interesting nonlinear effects are found, the most striking being the rapid change of the resonance frequency in the cross section for harmonic production as the intensity of the laser is increased. Both approximate and exact numerical results are presented.

Physical Review AApr 1, 19715 citations

Coherent Rayleigh-Brillouin scattering in molecular gases

Xingguo Pan, Mikhail N. Shneider, Richard B. Miles

We present an experimental and theoretical study of the coherent Rayleigh-Brillouin scattering in gases in the kinetic regime. Gas density perturbation waves were generated by two crossing pump laser beams through optical dipole forces. A probe laser beam was then coherently scattered from the perturbation waves. The line shape of the scattered light was modeled using kinetic theory. The model takes into account the internal energy modes of the gas particles and is applicable to both molecular and atomic gases. We discuss the implication of coherent Rayleigh-Brillouin scattering on kinetic theory and photon matter interaction.We present an experimental and theoretical study of the coherent Rayleigh-Brillouin scattering in gases in the kinetic regime. Gas density perturbation waves were generated by two crossing pump laser beams through optical dipole forces. A probe laser beam was then coherently scattered from the perturbation waves. The line shape of the scattered light was modeled using kinetic theory. The model takes into account the internal energy modes of the gas particles and is applicable to both molecular and atomic gases. We discuss the implication of coherent Rayleigh-Brillouin scattering on kinetic theory and photon matter interaction.

Physical Review AMar 22, 2004144 citations

Laser-radiation scattering spectra in three-level quantum systems

É. G. Pestov

Soviet Journal of Quantum ElectronicsMay 1, 19870 citations

The scattering of light by a coherent system of two-level particles

Oleg N. Gadomsky, V. R. Nagibarov

Physics Letters AFeb 1, 19723 citations

Two-photon absorption induced stimulated Rayleigh-Bragg scattering

Guang S. He, Paras N. Prasad

A frequency-unshifted and backward stimulated scattering can be efficiently generated in one-photon-absorption free but two-photon absorbing materials. Using a number of novel two-photon absorbing dye solutions as the scattering media and nanosecond pulsed laser as the pump beams, a highly directional backward stimulated scattering at the exact pump wavelength can be readily observed once the pump intensity is higher than a certain threshold level. The spectral and spatial structures as well as the temporal behavior and optical phase-conjugation property of this new type of backward stimulated scattering have been experimentally studied. This stimulated scattering phenomenon can be explained by using a model of two-photon-excitation enhanced standing-wave Bragg grating initially formed by the strong forward pump beam and much weaker backward Rayleigh scattering beam; the partial reflection of the pump beam from this grating provides an positive feedback to the initial backward Rayleigh scattering beam without suffering linear attenuation influence. Comparing to other known stimulated (Raman, Brillouin, Rayleigh-wing, and Kerr) scattering effects, the stimulated Rayleigh-Bragg scattering exhibits the advantages of no frequency-shift, low pump threshold, and low spectral linewidth requirement.A frequency-unshifted and backward stimulated scattering can be efficiently generated in one-photon-absorption free but two-photon absorbing materials. Using a number of novel two-photon absorbing dye solutions as the scattering media and nanosecond pulsed laser as the pump beams, a highly directional backward stimulated scattering at the exact pump wavelength can be readily observed once the pump intensity is higher than a certain threshold level. The spectral and spatial structures as well as the temporal behavior and optical phase-conjugation property of this new type of backward stimulated scattering have been experimentally studied. This stimulated scattering phenomenon can be explained by using a model of two-photon-excitation enhanced standing-wave Bragg grating initially formed by the strong forward pump beam and much weaker backward Rayleigh scattering beam; the partial reflection of the pump beam from this grating provides an positive feedback to the initial backward Rayleigh scattering beam without suffering linear attenuation influence. Comparing to other known stimulated (Raman, Brillouin, Rayleigh-wing, and Kerr) scattering effects, the stimulated Rayleigh-Bragg scattering exhibits the advantages of no frequency-shift, low pump threshold, and low spectral linewidth requirement.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIEJan 28, 20051 citation

A

relativistic two-level model of a massive atom in the presence of an external plane-wave laser beam is solved. Using the resulting wave functions, the cross sections for the scattering of a photon of the laser frequency or one of its harmonics is calculated. Many interesting nonlinear effects are found, the most striking being the rapid change of the resonance frequency in the cross section for harmonic production as the intensity of the laser is increased. Both approximate and exact numerical results are presented.