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US 5,268,693 AGranted
Semiconductor film free electron laser
AssigneeTrustees of Dartmouth College
InventorJohn E. Walsh
Life of this patent
Estimating the term…
Abstract
Semiconductor film FEL uses an electron beam and a semiconducting-film-loaded, open, quasi-optical resonator to produce coherent, electromagnetic radiation at submm and far-infrared wavelengths.
Claims21
Laser apparatus comprising
- resonator means for defining a resonant cavity in which stimulated radiation can propagate to generate coherent electromagnetic laser radiation, said resonator means including
- at least one semiconductor element having at least a first surface, and
- means for directing a beam of electrons over said surface in a direction substantially parallel to said surface and at a selected proximity to said surface, said electrons having a velocity greater than a selected value determined by the phase velocity of light in said resonator means, to produce stimulated radiation so that said stimulated radiation propagates in said resonant cavity to generate coherent electromagnetic laser radiation.
Dependencies are inferred from the claim text.