Ultra-short terahertz pulse generator having multiple foils

摘要

This specification relates to a terahertz pulse generator capable of generating ultra-short terahertz pulses by use of electron beams transported through a plurality of foils. The plurality of foils in a shape of disc are arranged in an overlapped state and form a conical shape that diameters of the disc-shaped foils sequentially decrease along a direction that the electron beam is transported. Coherent radiation, which is generated as the ultra-short electron beam is transported through the foils in respective spaced gaps of the foils, is propagated toward the outside of the disc-shaped foils and gathered with forming a conical wave surface at edges of the disc-shaped foils. This may result in enhancement of generation efficiency of the terahertz waves.

主权项

1. An ultra-short terahertz pulse generator comprising:
a plurality of foils arranged in one direction, the plurality of foils being arranged such that at least parts of their areas are overlapped; wherein spaced gaps are formed between the at least parts of the areas of the plurality of foils that are overlapped, and an accelerator configured to generate short electron bunches going along one direction normal to the foil surfaces to pass through the plurality of foils, whereby when the short electron bunches pass through the plurality of foils and the spaced gaps ultra-short terahertz pulses are generated inside the gaps between the foils.