Coherent multi-heterodyne spectroscopy using acousto-optic frequency combs
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comunitat-uji-handle2:10234/43662
comunitat-uji-handle3:10234/43643
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Title
Coherent multi-heterodyne spectroscopy using acousto-optic frequency combsDate
2018Publisher
Optical Society of AmericaISSN
1094-4087Bibliographic citation
DURÁN, Vicente; SCHNÉBELIN, Cȏme; DE CHATELLUS, Hugues Guillet. Coherent multi-heterodyne spectroscopy using acousto-optic frequency combs. Optics express, 2018, vol. 26, no 11, p. 13800-13809.Type
info:eu-repo/semantics/articleVersion
info:eu-repo/semantics/publishedVersionAbstract
We propose and characterize experimentally a new source of optical frequency combs for performing multi-heterodyne spectrometry. This comb modality is based on a frequency-shifting loop seeded with a continuous-wave ... [+]
We propose and characterize experimentally a new source of optical frequency combs for performing multi-heterodyne spectrometry. This comb modality is based on a frequency-shifting loop seeded with a continuous-wave (CW) monochromatic laser. The comb lines are generated by successive passes of the CW laser through an acousto-optic frequency shifter. We report the generation of frequency combs with more than 1500 mutually coherent lines, without resorting to non-linear broadening phenomena or external electronic modulation. The comb line spacing is easily reconfigurable from tens of MHz down to the kHz region. We first use a single acousto-optic frequency comb to conduct self-heterodyne interferometry with a high frequency resolution (500 kHz). By increasing the line spacing to 80 MHz, we demonstrate molecular spectroscopy on the sub-millisecond time scale. In order to reduce the detection bandwidth, we subsequently implement an acousto-optic dual-comb spectrometer with the aid of two mutually coherent frequency shifting loops. In each architecture, the potentiality of acousto-optic frequency combs for spectroscopy is validated by spectral measurements of hydrogen cyanide in the near-infrared region. [-]
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Optics Express Vol. 26, Issue 11.Investigation project
ANR-14-CE32-0022Rights
© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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