Cavity ringdown spectroscopy at 2 $μ$m wavelength assisted by a comb-locked optical parametric oscillator
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866913866021076992 |
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| author | D'Agostino, Vittorio Fasci, Eugenio Khan, Muhammad Asad Gravina, Stefania Gianfrani, Livio Castrillo, Antonio |
| author_facet | D'Agostino, Vittorio Fasci, Eugenio Khan, Muhammad Asad Gravina, Stefania Gianfrani, Livio Castrillo, Antonio |
| contents | We report on a comb-locked cavity ring-down spectrometer developed for high-precision molecular spectroscopy at 2 $μ$m. It is based on the use of an external-cavity diode laser that is offset-frequency locked to the signal output of a singly-resonant optical parametric oscillator. This latter acts as reference laser, being locked to a self-referenced optical frequency comb, which in turn is stabilized against a GPS-disciplined Rb-clock. The performance of the spectrometer is investigated by probing a pair of N$_2$O transitions belonging to hot vibrational bands. One of these, never observed before, is included in the N$_2$O line list of the ExoMol database. Absolute center frequencies are retrieved with a 1-$σ$ global uncertainty of 108 kHz. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_23418 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cavity ringdown spectroscopy at 2 $μ$m wavelength assisted by a comb-locked optical parametric oscillator D'Agostino, Vittorio Fasci, Eugenio Khan, Muhammad Asad Gravina, Stefania Gianfrani, Livio Castrillo, Antonio Optics Atomic Physics We report on a comb-locked cavity ring-down spectrometer developed for high-precision molecular spectroscopy at 2 $μ$m. It is based on the use of an external-cavity diode laser that is offset-frequency locked to the signal output of a singly-resonant optical parametric oscillator. This latter acts as reference laser, being locked to a self-referenced optical frequency comb, which in turn is stabilized against a GPS-disciplined Rb-clock. The performance of the spectrometer is investigated by probing a pair of N$_2$O transitions belonging to hot vibrational bands. One of these, never observed before, is included in the N$_2$O line list of the ExoMol database. Absolute center frequencies are retrieved with a 1-$σ$ global uncertainty of 108 kHz. |
| title | Cavity ringdown spectroscopy at 2 $μ$m wavelength assisted by a comb-locked optical parametric oscillator |
| topic | Optics Atomic Physics |
| url | https://arxiv.org/abs/2505.23418 |