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We present the development of the first ultrafast transmission electronmicroscope (UTEM) driven by localized photoemission from a field emittercathode. We describe the implementation of the instrument, the photoemitterconcept and the quantitative electron beam parameters achieved. Establishing anew source for ultrafast TEM, the G\"ottingen UTEM employs nano-localizedlinear photoemission from a Schottky emitter, which enables operation withfreely tunable temporal structure, from continuous wave to femtosecond pulsedmode. Using this emission mechanism, we achieve record pulse properties inultrafast electron microscopy of 9 {\AA} focused beam diameter, 200 fs pulseduration and 0.6 eV energy width. We illustrate the possibility to conductultrafast imaging, diffraction, holography and spectroscopy with thisinstrument and also discuss opportunities to harness quantum coherentinteractions between intense laser fields and free electron beams.

Ultrafast transmission electron microscopy using a laser-driven field emitter: femtosecond resolution with a high coherence electron beam