Group synchronism and dispersive effects in a waveguide terahertz free-electron laser

Naum S. Ginzburg; Ekaterina R. Kocharovskaya; Alexander S. Sergeev

doi:10.1117/12.678362

19 May 2006 Group synchronism and dispersive effects in a waveguide terahertz free-electron laser

Naum S. Ginzburg, Ekaterina R. Kocharovskaya, Alexander S. Sergeev

Proceedings Volume 6257, ICONO 2005: Nonlinear Laser Spectroscopy, High Precision Measurements, and Laser Biomedicine and Chemistry; 62570H (2006) https://doi.org/10.1117/12.678362
Event: ICONO 2005, 2005, St. Petersburg, Russian Federation

Abstract

A theoretical model of a waveguide free-electron laser is developed which includes the mismatches of group and cavity synchronism conditions as well as the waveguide dispersion. Under the assumption of a high quality resonator, a parabolic equation for the evolution of the profile of electromagnetic pulse is derived. The condition of self-excitation and the parameters of stationary generation are found. It is shown that the waveguide dispersion makes it possible the operation of free-electron laser not only under positive but also under negative mismatch between the period of electron bunch injection and the period of electromagnetic pulse round trip. The transient and nonlinear stages of the free-electron laser operation are analyzed, and the optimal mismatches of group and cavity synchronism conditions are found, ensuring, in particular, utmost efficient generation of the terahertz pulses.

Citation Download Citation

Naum S. Ginzburg, Ekaterina R. Kocharovskaya, and Alexander S. Sergeev "Group synchronism and dispersive effects in a waveguide terahertz free-electron laser", Proc. SPIE 6257, ICONO 2005: Nonlinear Laser Spectroscopy, High Precision Measurements, and Laser Biomedicine and Chemistry, 62570H (19 May 2006); https://doi.org/10.1117/12.678362

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