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Title:FEED-FORWARD COHERENT LINK FROM A COMB TO A DIODE LASER : APPLICATION TO SATURATED CAVITY RING DOWN SPECTROSCOPY
Author(s):Kassi, Samir
Contributor(s):Romanini, Daniele; Marangoni, Marco; Prevedelli, Marco; Gotti, Riccardo
Subject(s):Mini-symposium: Frequency-Comb Spectroscopy
Abstract:We applied a feed-forward frequency control scheme to establish a phase-coherent link from an optical frequency comb to a distributed feedback (DFB) diode laser: This allowed us to exploit the full laser tuning range (up to 1 THz) with the linewidth and frequency accuracy of the comb modes. The approach relies on the combination of an RF single-sideband modulator (SSM) and of an electro-optical SSM, providing a correction bandwidth in excess of 10 MHz and a comb-referenced RF-driven agile tuning over several GHz. As a demonstration, we obtain a 0.3 THz cavity ring-down scan of the low-pressure methane absorption spectrum. The spectral resolution is 100 kHz, limited by the self-referenced comb, starting from a DFB diode linewidth of 3 MHz. To illustrate the spectral resolution, we obtain saturation dips for the 2\nub{3} R(6) methane multiplet at $\mu$bar pressure. Repeated measurements of the Lamb-dip positions provide a statistical uncertainty in the kHz range.
Issue Date:06/19/18
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/100451
DOI:10.15278/isms.2018.TG07
Other Identifier(s):TG07
Date Available in IDEALS:2018-08-17
2018-12-12


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