A modification of the plasma beat-wave excitation scheme is proposed, aimed at a significant increase of the resulting plasma wave amplitude. The modification employs two laser beams with a down-chirped beat frequency that follows, on the average, the amplitude-dependent frequency of the intense plasma wave. Numerical and analytical calculations that support the proposed scheme are presented. Also, new analytical solutions for the constant beat-frequency case are obtained. Finally, a plausible experimental setup is suggested, where one of two CO2 laser beams attains the necessary frequency chirp by passing through a diffraction grating pair.
We describe the interaction of light pulses with a GaAs/AlAs resonant tunneling structure. We demonstrate that light with an average power of less than 10 μW can induce switching, and show that switching is accompanied by a change in the optical absorption. These results suggest a number of new applications for the resonant tunneling structure, including light-by-light switching.
We have employed an experimental apparatus in which a sample of nearly ideal, two-level atoms can be exposed to homogeneous amplitudeand phase-controlled resonant laser light to study fundamental dynamical, spectral, and radiative atomic properties. In particular, we show unambiguously that atomic 6uorescence is maximized when atoms are purely in their excited state rather than in a superposition of ground and excited state. We also show that fluorescence lifetimes are independent of the atomic excitation level, and finally, we demonstrate interesting correlations between atomic dynamics and atomic spectral features.
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