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AIP conference proceedings

Extrarresonant stimulated Rayleigh scattering from a two-level system interacting with two intense fields

Harry Friedmann, A. D. Wilson‐Gordon

Published Jan 1, 1988• 2 citations
Publisher

Abstract

Pressure‐ and radiation‐induced stimulated Rayleigh scattering in the Rayleigh wing are discussed quantitatively for the case where both the pump laser at fixed frequency ω1 and the probe laser with variable frequency ω2 are arbitrarily strong. The absorption spectra of the pump and probe fields, both expressed as a function of ω2, exhibit a narrow dispersive lineshape centered at the fixed frequency ω1 but with opposite tendencies: the field whose frequency is closest to the resonance frequency, ωba, of the two‐level system always undergoes stimulated emission, the other field being absorbed. The intensity of these processes increases, up to a limit, with the intensity of both the pump and probe fields. A qualitative explanation for the origin of the dispersive lineshape is suggested.

DOI
10.1063/1.37395

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Journal of Physics B Atomic and Molecular Physics•Oct 14, 1985•0 citations
Pressure‐ and radiation‐induced stimulated Rayleigh scattering in the Rayleigh wing are discussed quantitatively for the case where both the pump laser at fixed frequency ω1 and the probe laser with variable frequency ω2 are arbitrarily strong. The absorption spectra of the pump and probe fields, both expressed as a function of ω2, exhibit a narrow dispersive lineshape centered at the fixed frequency ω1 but with opposite tendencies: the field whose frequency is closest to the resonance frequency, ωba, of the two‐level system always undergoes stimulated emission, the other field being absorbed. The intensity of these processes increases, up to a limit, with the intensity of both the pump and probe fields. A qualitative explanation for the origin of the dispersive lineshape is suggested.
When a two-level system interacts resonantly with a saturating pump laser, the absorption profile of a probe wave in the Rabi sidebands resembles two separate dispersion profiles. At sufficiently high probe intensity this effect is accompanied by a dispersive profile in the pump-wave absorption, considered as a function of the probe-wave frequency, and also by a dip in the population of the upper state of the two-level system. The relative stabilization of the ground state is interpreted in terms of two-laser-photon processes where absorption of a pump (probe) photon is followed by stimulated emission of a probe (pump) photon. The dispersive absorption profile is attributed to the competition between three- and four-photon scattering processes.
In a two-level system that is subjected to a resonant coherent pump, an extraresonance that resembles stimulated Rayleigh scattering takes place when the pump reaches a moderate intensity. In addition to the major features obtained in pressure-induced extraresonance, this scattering is also verified as a field-induced extra-resonance. A nonlinear power-induced decay rate was found and is predicted to give new features of the extraresonance in the gain and in the line shape. Because of the existence of this decay, Lorentzian-shaped contribution to the gain, in addition to the well-known dispersive one, was found. These effects are especially pronounced in a dephasing mechanism and may produce an extraresonance with a frequency shift that is considerably larger than that of the conventional pressure-induced one.
Amplification of probe radiation by an inversionless two-level system in the 'red' wing of its spectral line is studied theoretically during the resonance absorption of intense cw laser radiation. The effect is caused by the inequality of the spectral densities of the Einstein coefficients for absorption and stimulated emission outside the absorption line under conditions when homogeneous broadening, due to the interaction of particles with the buffer gas, significantly exceeds the natural broadening (at high pressures of the buffer gas). It is found that the larger the inversionless gain, the higher the buffer gas pressure and the pump radiation intensity. It is established that at high enough pump intensity, the probe field is amplified along the entire region of the 'red' wing of the line (at any negative detunings of the probe field frequency).
We investigate the structure of the dispersion and absorption lineshapes for driven two-level systems against a weak probing laser field. It is shown that the shape of both curves depends critically on the detuning of the driving laser to the atomic resonance frequency and can be transformed continuously and oppositely between Rayleigh (or ‘dispersion-like’) and Lorentzian (or ‘absorption-like’) lineshapes. An analysis in the dressed state basis explains these features via the different influences of coherences and populations of the corresponding dressed states.
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.
The passage of strong monochromatic laser radiation through a resonance medium consisting of three-level atoms is investigated. It is shown that if collisions are taken into account in the scattered waves the resonances at combination frequencies occur to first order in the laser field intensity. A numerical analysis of the dependence of the stimulated electronic Raman scattering (SERS) components' gain factors on the pump frequency is carried out. The dispersion curves of the SERS components' gain (absorption) factors for fixed values of pump frequency and intensity are plotted.