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Terahertz time-domain spectroscopy (THz-TDS) based on high-speed asynchronous optical sampling (ASOPS) with two offset-locked GHz femtosecond lasers requires no mechanical time-delay scanner. Consequently, measurements with 1-GHz frequency resolution are performed at intrinsically high scan rates in the multikilohertz range. This is at least one order, in most cases several orders of magnitude faster...
The dielectric spectrum of D2O between 45 GHz and 1.7 THz is measured using terahertz time-domain spectroscopy. The data is modeled as a sum of Debye relaxations and Lorentzian oscillators. Similar to previous studies on H2O, evidence is shown of anti-correlated effects in bulk D2O. Work is being done to extend spectrometer bandwidth to 10 GHz to measure a possible low frequency oscillation at 11...
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