Single-frequency mid-infrared chip laser with a sub-hertz Lorentzian linewidth
Philippe Guay (1, 2), J\'er\^ome Genest (1), Vincent, Michaud-Belleau (1), Nicolas Bourbeau H\'ebert (1), David G. Lancaster (2), ((1) Centre d'optique, photonique et laser, Universit\'e Laval, Qu\'ebec,, Qu\'ebec G1V 0A6, Canada, (2) Laser Physics, Photonics Devices Laboratory,
TL;DR
This paper reports a compact, single-frequency mid-infrared chip laser with a sub-hertz Lorentzian linewidth, achieved through a Littman-Metcalf cavity configuration, demonstrating high coherence suitable for precise applications.
Contribution
The work introduces a novel single-frequency mid-infrared chip laser with an ultra-narrow linewidth, utilizing a simple and compact design with high side-mode suppression.
Findings
Linewidth limited by mechanical fluctuations
Lorentzian linewidth estimated below 1 Hz
High side-mode suppression ratio above 33 dB
Abstract
A guided-wave chip laser operating in a single longitudinal mode at 2860 nm is presented. The cavity was set in the Littman-Metcalf configuration to achieve single-frequency operation with a side-mode suppression ratio above 33 dB. The chip laser's linewidth was found to be limited by mechanical fluctuations, but its Lorentzian contribution was estimated to be lower than 1 Hz using a heterodyne technique. This demonstration incorporates a high coherence source with the simplicity provided by the compactness of chip lasers.
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Taxonomy
TopicsPhotonic and Optical Devices · Advanced Fiber Laser Technologies · Spectroscopy and Laser Applications