Journal
OPTICS EXPRESS
Volume 21, Issue 17, Pages 19743-19749Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.019743
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Funding
- NSF Centers for Chemical Innovation program [CHE-0847919]
- National Science Foundation [DGE-0809128]
- University of Virginia
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Chirped-pulse Fourier transform spectroscopy has recently been extended to millimeter wave spectroscopy as a technique for the characterization of room-temperature gas samples. Here we present a variation of this technique that significantly reduces the technical requirements on high-speed digital electronics and the data throughput, with no reduction in the broadband spectral coverage and no increase in the time required to reach a given sensitivity level. This method takes advantage of the frequency agility of arbitrary waveform generators by utilizing a series of low-bandwidth chirped excitation pulses paired in time with a series of offset single frequency local oscillators, which are used to detect the molecular free induction decay signals in a heterodyne receiver. A demonstration of this technique is presented in which a 67 GHz bandwidth spectrum of methanol (spanning from 792 to 859 GHz) is acquired in 58 mu s. (C) 2007 Optical Society of America
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