Open AccessStabilized hot electron bolometer heterodyne receiver at 2.5 THz
Author(s) -
D. J. Hayton,
J. R. Gao,
J. Kooi,
Yuan Ren,
Wen Zhang,
G. de Lange
Publication year - 2012
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.3688032
Subject(s) - bolometer , local oscillator , terahertz radiation , superheterodyne receiver , physics , allan variance , bandwidth (computing) , optoelectronics , broadband , intermediate frequency , optics , laser , noise temperature , heterodyne detection , amplifier , radio frequency , detector , phase noise , microwave , telecommunications , computer science , cmos , standard deviation , statistics , mathematics , quantum mechanics
We report on a method to stabilize a hot electron bolometer (HEB) mixer at 2.5 THz. The technique utilizes feedback control of the local oscillator (LO) laser power by means of a swing-arm actuator placed in the optical beam path. We demonstrate that this technique yields a factor of 50 improvement in the spectroscopic Allan variance time which is shown to be over 30?s in a 12?MHz noise fluctuation bandwidth. Furthermore, broadband signal direct detection effects may be minimized by this technique. The technique is versatile and can be applied to practically any local oscillator at any frequency.QN/Quantum NanoscienceApplied Science
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