Solid-State Cyclotron Maser.
DEPARTMENT OF THE NAVY WASHINGTON DC
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A solid-state cyclotron maser for generating low power 1 watt or less signals in the submillimeter frequency range 300 GHz-30,000 GHz includes an accelerating region, a drift region, and a metal grid therebetween. Both regions are formed from semiconductor materials, such as indium antimonide, having non-parabolic energy bands. The drift region is a thin disc having metallized outer surfaces, but includes an annular opening in themetal on the front size and a circular opening in the metal on the back side, and is grounded. A grid of metal rings is placed on the annular opening of the drift region. The accelerating region is a hollow cylinder having a metallized front surface. It couples to the drift region for covering the annular opening and the grid. A negative bias voltage is applied to the accelerating region and a magnetic field is applied to the maser at an angle to the axis of the maser. Electrons propagate in spiral trajectories through the acclerating region, grid and drift region. Movement of electrons within the non-parabolic energy bands of the semiconductor materials causes changes in the effective mass of the electrons. Phase-bunching of electrons occurs and electrons radiate coherently. Energy is removed from the drift region at the opening on its back side.
- Lasers and Masers
- Particle Accelerators