Electron beam pumped semiconductor laser
Electron-beam-pumped semiconductor ultra-violet optical sources (ESUVOSs) are disclosed that use ballistic electron pumped wide bandgap semiconductor materials. The sources may produce incoherent radiation and take the form of electron-beam-pumped light emitting triodes (ELETs). The sources may produce coherent radiation and take the form of electron-beam-pumped laser triodes (ELTs). The ELTs may take the form of electron-beam-pumped vertical cavity surface emitting lasers (EVCSEL) or edge emitting electron-beam-pumped lasers (EEELs). The semiconductor medium may take the form of an aluminum gallium nitride alloy that has a mole fraction of aluminum selected to give a desired emission wavelength, diamond, or diamond-like carbon (DLC). The sources may be produced from discrete components that are assembled after their individual formation or they may be produced using batch MEMS-type or semiconductor-type processing techniques to build them up in a whole or partial monolithic manner, or combination thereof.
1. A method of producing laser radiation, comprising:
(a) providing a semiconductor material that emits photons when subjected to electron bombardment;
(b) providing at least one cathode separated from the semiconductor material by a gap;
(c) providing at least one anode located on or near a surface of the semiconductor material;
(d) applying an electric potential between the cathode and the anode to transfer electrons from the cathode through the gap to the semiconductor material to excite emission of photons within the semiconductor material; and
(e) providing a hermetic envelope surrounding the gap,
wherein at least a portion of the photon production occurs within a laser cavity that includes a least a portion of the semiconductor material,
wherein the semiconductor material comprises an aluminum-gallium-nitride (AlGaN) alloy having an aluminum content great enough to provide an emission wavelength of less than about 250 nm.