 | High-resolution terahertz spectroscopy with a single tunable frequency comb |
Optics Express, Vol. 22, Issue 26, pp. 32276-32281 (2014)
http://dx.doi.org/10.1364/OE.22.032276
http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-22-26-32276http://dx.doi.org/10.1364/OE.22.032276
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We report an improvement of three orders of magnitude in the spectral resolution of a recently proposed single-comb terahertz spectroscopy [Opt. Lett. 39, 5669 (2014)]. The improvement is achieved by using a femtosecond optical pulse train with a tunable repetition rate. Terahertz comb with tunable spectral line spacing generated by the train is detected via nonlinear mixing with a harmonic of a CW signal from a microwave frequency synthesizer. By applying this technique to the low-pressure gas spectroscopy, we achieved a 100 kHz spectral resolution in measuring separate absorption lines of the rotational manifold of fluoroform (CF3H).
© 2014 Optical Society of America
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