Sideband cavity absorption readout (SideCAR) with a robust frequency lock

We present a simple, continuous, cavity-enhanced optical absorption measurement technique based on high-bandwidth Pound-Drever-Hall (PDH) sideband locking. The technique provides a resonant amplitude quadrature readout that can be mapped onto the cavity's internal loss rate and is naturally com...

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Bibliographic Details
Published in:Optics express 2022-01, Vol.30 (2), p.754-767
Main Authors: Rodrigues-Machado, Fernanda C, Pestre, Pauline, Dumont, Vincent, Bernard, Simon, Janitz, Erika, Scanlon, Liam, Enger, Shirin A, Childress, Lilian, Sankey, Jack
Format: Article
Language:English
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Summary:We present a simple, continuous, cavity-enhanced optical absorption measurement technique based on high-bandwidth Pound-Drever-Hall (PDH) sideband locking. The technique provides a resonant amplitude quadrature readout that can be mapped onto the cavity's internal loss rate and is naturally compatible with weak probe beams. With a proof-of-concept 5-cm-long Fabry-Perot cavity, we measure an absorption sensitivity ∼10 cm /Hz from 30 kHz to 1 MHz, and a minimum value of 6.6×10 cm /Hz at 100 kHz, with 38 µW collected from the cavity's circulating power.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.443109