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Journal Articles European Physical Journal: Applied Physics Year : 2008

Optoelectronic difference-frequency synthesiser: terahertz-waves for high-resolution spectroscopy

Abstract

We demonstrate a simple approach for a difference-frequency synthesiser within the terahertz domain. Two near-infrared CW diode lasers are frequency-locked to the resonances of a high finesse Fabry-Perot cavity using the Pound-Drever-Hall technique. Two acousto-optic modulators driven by RF synthesizers frequency-shift each diode laser and provide continuous tuning, modulation and switching capabilities for the difference-frequency. Terahertz-waves generated by heterodyne mixing in an ultrahigh-bandwidth photodetector are used to interrogate the rotational transitions in the ground state of the methyl-chloride.

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Dates and versions

hal-00480183 , version 1 (03-05-2010)

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L. Aballea, L.F. Constantin. Optoelectronic difference-frequency synthesiser: terahertz-waves for high-resolution spectroscopy. European Physical Journal: Applied Physics, 2008, 45 (2), pp.1. ⟨10.1051/epjap:2008188⟩. ⟨hal-00480183⟩
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