Abstract
Summary form only given. In this paper, a coherent narrowband tunable terahertz emission from an electron bunch is reported, transposing a technique well-known in nonlinear optics: interaction with laser pulses containing an internal modulation. The modulated pulses are produced from a titanium-sapphire laser using chirped pulse beating, and are focused on the electron beam, inside an undulator. The interaction leads to a modification of the energy distribution, which transforms into a charge density modulation when the electron bunch is deviated by the next bending magnet, and terahertz emission occurs.
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