Continuous-wave terahertz system with a 60 dB dynamic range

Gregory, I. S.; Tribe, W. R.; Baker, C.; Cole, B. E.; Evans, M. J.; Spencer, L.; Pepper, M.; Missous, M.
May 2005
Applied Physics Letters;5/16/2005, Vol. 86 Issue 20, p204104
Academic Journal
We have developed a high-performance continuous-wave terahertz imaging system based on photomixing. The emitter and detector are driven by compact, unstabilized, single-mode diode lasers. The all-optoelectronic, homodyne detection scheme yields both amplitude and phase information, and with careful optimization and matching of both emitter and receiver, a 60 dB dynamic range, at 0.53 THz, can be routinely achieved. This replicates the performance of established pulsed THz imagers at this frequency.


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