Experimental demonstration of a Michelson interferometer involving far-infrared broadband ultrashort light pulses
Abstract
Standard Michelson interferometers generally make use of narrowband, continuous-wave light as their longer coherence lengths make interference easier to ascertain. In contrast, for broadband, pulsed light, whose coherence lengths lie in the micrometer range, proving interference is a greater challenge. Using terahertz time-domain spectroscopy, this paper experimentally demonstrates interference for far-infrared, broadband (50–1000 GHz), ultrashort (~50 ps) light pulses with, at most, a 6.66̅ % error based on calculations and the central frequency.
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Standard Michelson interferometers generally make use of narrowband, continuous-wave light as their longer coherence lengths make interference easier to ascertain. In contrast, for broadband, pulsed light, whose coherence lengths lie in the micrometer range, proving interference is a greater challenge. Using terahertz time-domain spectroscopy, this paper experimentally demonstrates interference for far-infrared, broadband (50-1000 GHz), ultrashort (∼50ps) light pulses with, at most, a 6.66% error based on calculations and the central frequency.
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