Terahertz Photomixing with Diode Lasers in Low-Temperature-Grown GaAs

摘要

Recent optical heterodyne measurements with distributed Bragg reflector diodelaser pumps demonstrate that low temperature grown (LTG) GaAs photomixers will be useful in a compact all solid state terahertz source. Electrical 3 dB bandwidths as large as 650 GHz are measured in mixers with low electrode capacitance. These bandwidths appear to be independent of pump laser wavelength over the range 780-850 nm. Shorter wavelength pumping results in a significant reduction of the bandwidth. The best LTG-GaAs photomixers are used to generate coherent continuous wave output radiation at frequencies up to 5 THz.