| 摘要 |
A semiconductor laser includes a housing having a vacuum therein and a window that provides for the exit of a laser beam from the housing. A cathode within the housing emits a stream of electrons, and a wide bandgap semiconductor anode within said housing is impacted by the electron stream. The wide bandgap semiconductor has a bandgap energy and provides a resonator cavity that is physically spaced from the cathode. This resonant cavity is generally aligned with the window. An electric field acts in a space between the semiconductor anode and the cathode to accelerate the electron stream toward said semiconductor anode, thereby causing electron-hole pairs to be generated within the semiconductor anode, such that recombination of these electron-hole pairs generates photons having an energy that is generally equal to the bandgap energy of the semiconductor anode, these photons then forming a coherent laser beam.
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