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Article Dans Une Revue Applied Physics B - Laser and Optics Année : 2022

High stability in near-infrared spectroscopy: part 1, adapting clock techniques to optical feedback

Résumé

Optical feedback is an efficient way to narrow and stabilise semi-conductor lasers. As a step forward for ultra-stable, yet highly tunable sources, we developed a new prototype of a three-mirror V-shaped optical cavity (VCOF). It is made of a precisely machined Zerodur spacer, that holds 3 optical contacted mirrors forming a high finesse V-shaped cavity. This arrangement allows the resonant light to be sent back to the seeding laser, triggering a drastic narrowing of the emission linewidth well below the cavity mode width without the need for high-bandwidth active electronic lock of the laser on the cavity. Low expansion material and precise temperature control of the reference cavity leads to a source with Hz level frequency drift and 70 Hz-level emission linewidth at 215 THz. We discuss the benefits of this new prototype compared to its predecessor for high-sensitivity cavity ring down spectroscopy (CRDS). To serve this purpose, the frequency stabilised laser was characterised on short, mid and long time scales, using a high finesse etalon, a self referenced optical frequency comb and a long term saturated CRDS absorption Lamb dip measurement on water.
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Dates et versions

hal-03598400 , version 1 (31-03-2022)

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Mathieu Casado, Tim Stoltmann, Amaelle Landais, Nicolas Jobert, Mathieu Daëron, et al.. High stability in near-infrared spectroscopy: part 1, adapting clock techniques to optical feedback. Applied Physics B - Laser and Optics, 2022, 128 (3), pp.54. ⟨10.1007/s00340-022-07774-2⟩. ⟨hal-03598400⟩
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