Millimeter-wave generation at 110 GHz by laser modulation of a HgCdTe photodiode

Abstract

Millimeter-wave power is generated from an n+/p Hg0.74Cd0.26Te photovoltaic diode illuminated by two CO lasers of 5.467- and 5.478-μm wavelengths, respectively. The output frequency is determined by the laser line separation to be 110 GHz. A maximum power of 0.75 μW is observed when the diode is dc biased at 0.5 V in the reverse direction.

Femtosecond demodulation source for high-resolution submillimeter spectroscopy

“…Approaches to this problem have included a series of advances in nonlinear frequency multiplication and cooled detector development, 1-4 the extension of fundamental electron beam oscillators [5][6][7] and fundamental solid-state oscillators to higher frequency, [8][9][10] and optical heterodyne down conversion. [11][12][13][14][15][16][17] In this letter we report an alternative, the demodulation of a mode-locked femtosecond laser pulse train 18 by means of a subpicosecond photoconductive switch ͑PCS͒ fabricated on low-temperature grown GaAs ͑LTG-GaAs͒. 19 In these sources submillimeter wave ͑SMM͒ radiation is produced by the demodulation of an optical pulse train by photoconductive phenomena and the conduction of the resulting current through a radiating log spiral antenna.…”