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With a low emittance and short-bunch electron beam at a high repetition raterealized by a superconducting linac, stimulated excitation of an optical cavityat the terahertz spectrum range has been shown. The electron beam passedthrough small holes in the cavity mirrors without being destroyed. A sharpresonance structure which indicated wide-band stimulated emission via coherentdiffraction radiation was observed while scanning the round-trip length of thecavity.

Stimulated excitation of an optical cavity by a multi-bunch electron beam via coherent diffraction radiation process