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 Title: HIGH-RESOLUTION AND ULTRA-BROADBAND DIRECT-COMB ABSOLUTE-SPECTROSCOPY BY MEANS OF THE SCANNING MICRO-CAVITY RESONATOR (SMART) TECHNIQUE Author(s): Gambetta, Alessio Contributor(s): Galzerano, Gianluca; Laporta, Paolo; Coluccelli, Nicola; Wang, Yuchen; Vicentini, Edoardo Subject(s): Mini-symposium: Frequency-Comb Spectroscopy Abstract: \begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.4]{Illinois..eps} \end{wrapfigure} By exploiting scanning Fabry-P\'{e}rot micro-cavity resonator (SMART) we developed a simple and compact spectrometer capable of resolving the mode structure of an optical frequency comb, with a frequency resolution limited only by the comb tooth linewidth. The SMART approach can be adopted in any spectral window from UV to THz and represents an easy and completely “locking-free” approach to direct-comb spectroscopy, drastically reducing the system complexity when compared to the more conventional methods like the VIPA, dual- comb and Vernier. Furthermore, high-speed/high-sensitivity detection and straightforward absolute calibration of the optical-frequency axis are still granted by the SMART spectrometer, together with an ultimate resolution limited only by the optical linewidth of the frequency comb source adopted for the measurement. We present an application to broadband and high-precision spectroscopy of acetylene at 1.54 $\mu$m. Also, by means of an auxiliary 2500-finesse cavity exploited as a sample with narrow- transmission features, we show the ability of the SMART approach to resolve the 400 kHz resonances of the auxiliary cavity, demonstrating a final resolution well below than the 20 MHz linewidth of the transmission-modes of the SMART micro-resonator employed for optical- detection. Issue Date: 06/20/18 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/100788 DOI: 10.15278/isms.2018.WA08 Other Identifier(s): WA08 Date Available in IDEALS: 2018-08-172018-12-12
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