Demonstration of a phase-lockable microwave to submillimeter wave sweeper

Steve B. Waltman; Leo W. Hollberg; Alexander K. McIntosh; Elliott R. Brown

doi:10.1117/12.262739

18 December 1996 Demonstration of a phase-lockable microwave to submillimeter wave sweeper

Steve B. Waltman, Leo W. Hollberg, Alexander K. McIntosh, Elliott R. Brown

Proceedings Volume 2842, Millimeter and Submillimeter Waves and Applications III; (1996) https://doi.org/10.1117/12.262739
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

The development of low-temperature-grown GaAs photomixers enables the construction of a microwave to submillimeter- wave source capable of large frequency sweeps. By utilizing semiconductor diode lasers to drive the photomixer, this source is all solid-state and compact, and has small power consumption. Frequency stabilization of the semiconductor diode lasers allows this source to be phase-locked to an external microwave reference. Two 805 nm extended-cavity- diode lasers are mixed in a low-temperature-grown GaAs photoconductive photomixer. The difference-frequency mixing product is radiated by a planar spiral antenna and collimated by a Si lens. This output is phase-locked to a microwave reference by downconverting it in a whisker- contacted Schottky-barrier diode harmonic mixer and using the output to offset-phase-lock one laser to the other. The photomixer output power is 300 nW at 200 GHz and 10 nW at 1.6 THz, as measured by a 4 K InSb bolometer calibrated with a methanol laser and a power meter at 526 and 812 GHz.

Citation Download Citation

Steve B. Waltman, Leo W. Hollberg, Alexander K. McIntosh, and Elliott R. Brown "Demonstration of a phase-lockable microwave to submillimeter wave sweeper", Proc. SPIE 2842, Millimeter and Submillimeter Waves and Applications III, (18 December 1996); https://doi.org/10.1117/12.262739

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