Showing papers by "Dino A. Jaroszynski published in 2001"
TL;DR: In this paper, the femtosecond electron pulses with relativistic energies were found to extend as high as 0.4 keV and the authors showed that these high energies are due to ponderomotive acceleration in an evanescent field extending from the metal film out into the vacuum.
Abstract: High-power femtosecond laser pulses have been used to excite surface plasmons in 500 A silver and gold films. Nonlinear excitation results in the emission of electron bunches through multiphoton excitation at low power and laser-induced field emission at high power. The energies of photoelectrons are found to extend as high as 0.4 keV. Calculations show that these high energies are due to ponderomotive acceleration in an evanescent field extending from the metal film out into the vacuum. The theoretical calculations suggest that femtosecond electron pulses with relativistic energies can be generated using longer wavelengths or by developing the surface morphology.
68 citations
21 Dec 2001-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this article, a method for the generation of quasi-unipolar pulses based on coherent synchrotron radiation from a quasi-planar electron bunch moving along a curved trajectory is proposed and theoretically studied.
Abstract: A method for the generation of quasi-unipolar pulses based on coherent synchrotron radiation from a quasi-planar electron bunch moving along a curved trajectory is proposed and theoretically studied. It is demonstrated that the experimental realization of this method at an existing installation (Terahertz to Optical Pulse Source) can result in generation of picosecond pulses with a peak power of up to 200 MW.
23 citations
TL;DR: In this paper, a dispersion relation for plane waves of weakly relativistic intensities is derived, which takes into account the polarization of the waves and the nonlinearities with respect to both their amplitudes.
Abstract: The coupled propagation of two electromagnetic waves in plasma is studied to establish the conditions for induced transparency. Induced transparency refers to the situation where both waves propagate unattenuated, although the frequency of one ~or both! of them is below the plasma frequency so that it could not propagate in the absence of the other. The effect is due to the interaction of the waves through their beat, which modulates both the electron mass and, by exciting longitudinal plasma oscillations, their number density, and thus the plasma frequency. Starting from a relativistic fluid description, a dispersion relation for plane waves of weakly relativistic intensities is derived, which takes into account the polarization of the waves and the nonlinearities with respect to both their amplitudes. This serves as a basis for the exploration of the conditions for induced transparency and the modes of propagation.
3 citations
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2 citations
TL;DR: A reply to the comment by W. Luis Mochan and Vera L. Brudny as mentioned in this paper, "Noncausal time response in frustrated total internal reflection?" is given in the Appendix.
Abstract: A reply to the comment by W. Luis Mochan and Vera L. Brudny. "Noncausal time response in frustrated total internal reflection?"
2 citations
TL;DR: In this article, an analysis of an undoped semiconductor strongly pumped by a coherent electromagnetic radiation field is presented, and the free-carrier dynamics and the incident and scattered fields are described classically and self-consistently.
Abstract: We present an analysis of an undoped semiconductor strongly pumped by a coherent electromagnetic radiation field. The free-carrier dynamics and the incident and scattered fields are described classically and self-consistently. The analysis predicts the existence of a collective instability which simultaneously generates a strong free-carrier grating along the propagation direction and a coherently backscattered radiation field. An example is given showing scattered intensities approaching 100% of the pump intensity. A realistic experiment to enable observation of this phenomenon is described.
2 citations