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Pump pulse

Nano-patterned photocathode. Photoemission pulse. Extraction grid (10-100kV). High-power ultrafast laser. Synchronized RF pulse compression cavity. Pump pulse. Objective lens. Time delay. Sample. Pulsed electron beam from MHz laser-driven photocathode. Imaging lenses. Detectors.

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Pump pulse

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  1. Nano-patterned photocathode Photoemission pulse Extraction grid (10-100kV) High-power ultrafast laser Synchronized RF pulse compression cavity Pump pulse Objective lens Time delay Sample Pulsed electron beam from MHz laser-driven photocathode Imaging lenses Detectors Development of an Ultrafast Electron Microscope with <1nm-ps Spatio-temporal ResolutionW. Andreas Schroeder, University of Illinois at Chicago – Davis, DMR 0619573 Concept: To combine the high spatial resolution of today’s electron microscopes with the high temporal resolution afforded by ultrashort-pulse lasers into an instrument capable of directly visualizing fundamental dynamic processes on the nano-scale; e.g., in nano-science and materials science. • Key research challenges: • Generation of a high-quality ultra-short • electron pulse through the use of a • resonantly-laser-driven nano-patterned • photocathode operating on the same • principle as phased-array radar. • Avoidance and compensation of space- • charge effects to assure attainment of sub- • 1nm.ps space-time resolution by appropriate • design of microscope column and electron • optics (lenses). • Development of efficient electron detection • techniques to facilitate rapid data acquisition • in an operational ultrafast electron • microscope.

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