Microresonator-based high-resolution gas spectroscopy

Optics Letters
Mengjie YuAlexander L Gaeta

Abstract

We report the first demonstration of a microresonator-based tunable mode-locked frequency comb source. We achieve a mode-hop-free tuning range of 16 GHz by simultaneously tuning both the pump laser and the cavity resonance while keeping the system in a multi-soliton mode-locked state. The optical spectrum spans 2520-4125  cm-1 (2.425-3.970 μm) pumping at 3508  cm-1 (2.850 μm) in a silicon microresonator with a comb line spacing of 4.23  cm-1 (127 GHz). Our scanning technique can be used to increase the effective resolution of the microresonator-based comb spectroscopy. As a proof-of-principle demonstration, we record the absorption spectrum of the rovibrational transitions of the υ3 and υ2+(υ4+υ5)+0 bands of acetylene. We measure absorption features as narrow as 0.21  cm-1 (6.4 GHz) full width at half-maximum at a frequency sampling step of 80 MHz.

References

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Citations

Mar 8, 2018·Science Advances·Avik DuttMichal Lipson
Aug 11, 2018·Science·Tobias J KippenbergMichael L Gorodetsky
Mar 4, 2020·Optics Express·Yu-Jen LeeJoseph J Talghader
Sep 14, 2019·Optics Letters·Bok Young KimAlexander L Gaeta
Jan 1, 2018·Applied Physics. B, Lasers and Optics·Ben HendersonSimona M Cristescu
Jun 16, 2018·Optics Letters·Hyungwoo Choi, Andrea M Armani
Aug 30, 2019·Optics Letters·Mengjie YuAlexander L Gaeta
Mar 12, 2020·Science Advances·Liron SternScott B Papp
May 15, 2021·Optics Letters·Joonhyuk HwangHansuek Lee

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