Dual comb modelocking with spectroscopy and lidar applications

Ursula Keller

doi:10.1117/12.2591837

8 March 2021 Dual comb modelocking with spectroscopy and lidar applications

Ursula Keller

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Proceedings Volume 11676, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXI; 1167603 (2021) https://doi.org/10.1117/12.2591837
Event: SPIE LASE, 2021, Online Only

Abstract

A fully stabilized optical frequency comb provides equally spaced frequencies for a precise ruler in optical frequency metrology. This talk will review recent progress in dual-comb generation from diode pumped solid-state and vertical emitting semiconductor lasers. In dual-comb modelocked operation, the initially unpolarized beam is split with an intracavity birefringent crystal. A mode-locked integrated external-cavity surface-emitting laser (MIXSEL) integrates both the gain and the saturable absorber layer within the same semiconductor wafer which simplifies the laser geometry to a linear straight cavity with excellent noise performance. A dual-comb gigahertz optically pumped MIXSEL has been used for molecular spectroscopy and lidar applications without the need of any additional stabilization. More recently a dual-comb diode-pumped Yb:CaF2 laser has been demonstrated at 140 MHz. For lidar applications we compare both lasers demonstrating micron precision over a potential ambiguity range of multi-kilometers and multi-kilohertz update rates.

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Ursula Keller "Dual comb modelocking with spectroscopy and lidar applications", Proc. SPIE 11676, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXI, 1167603 (8 March 2021); https://doi.org/10.1117/12.2591837

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