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Two-Stream Instabilities in Solids.

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Final technical rept. 1 Nov 67-31 Oct 68,

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A new, versatile, coplanar-contact device configuration was developed for generation of coherent emission from indium antimonide. The devices, which generate coherent emission at frequencies from 6.5 to 30 GHz, exhibit three types of operation. Emission is generated 1 in a thin-layer plasma formed by a strong transverse magnetic field, 2 in a thin-layer plasma formed as a result of the coplanar-contact configuration and 3 in a thick-layer plasma formed by forcing carriers away from the contact surface with a strong transverse magnetic field. Dispersion relationships which describe each type of operation was formulated. In the first and second types of operation, instantaneous power levels of 1 to 10 microwatts are emitted for input power levels of 0.2 to 1.5W. In the third type of operation, with an input power level of 2W, peak output power levels of 80 to 170 microwatts at X-band frequencies was measured. The calculated output power of emission generated in a thin plasma layer agrees with the measured values. The low input power level, which is required for emission from the coplanar-contact devices, permits cw operation in several samples. Low-frequency instabilities generated in a thick plasma layer are frequency-locked by a 160 MHz external signal with a -3 dBm power level. At room temperature noise emission is generated by coplanar-contact or rod-shaped samples in a transverse magnetic field greater than 10 kG. Efficient power coupling from an interdigital line system to the wave generated in a thin-layer plasma on a rod-shaped sample was not achieved. Author

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  • Solid State Physics
  • Radiofrequency Wave Propagation

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