Double-Resonance Spectroscopy of Methane Using a Comb Probe
| Autor: | Isak Silander, Lucile Rutkowski, Grzegorz Sobon, Ove Axner, Aleksandra Foltynowicz, Vinicius Silva de Oliveira, Alexandra C. Johansson, Kevin K. Lehmann |
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| Přispěvatelé: | Umeå University, Institut de Physique de Rennes (IPR), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Wroclaw University of Science and Technology, University of Virginia, Fundacja na rzecz Nauki Polskiej, FNP: POIR.04.04.00-00-434D/17-00, Knut och Alice Wallenbergs Stiftelse: KAW 2015.0159, Vetenskapsrådet, VR: 2016-03593, Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), University of Virginia [Charlottesville] |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Highest temperature
Materials science Optical parametric oscillators 7. Clean energy Molecular state Fourier transform spectroscopy Spectral line Temperature spectra Optical pumping Frequency comb Spacecraft instruments Spectroscopy [PHYS]Physics [physics] Spectrometers Resonance Fourier transform infrared spectroscopy Fourier series Spectra's Optical-optical double resonance CH 4 Optical-optical double resonance spectroscopy Probe transition Optical parametric oscillator Continuous wave Probes Exo-planets Atomic physics Pulsed lasers Molecular physics Double-resonance spectroscopy Methane Continuous wave lasers Liquefied gases |
| Zdroj: | 2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021 2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021, Jun 2021, Munich, Germany. ⟨10.1109/CLEO/Europe-EQEC52157.2021.9542713⟩ |
| DOI: | 10.1109/CLEO/Europe-EQEC52157.2021.9542713⟩ |
| Popis: | International audience; Optical-optical double resonance (OODR) spectroscopy is a powerful tool for the experimental assignment of highly-excited molecular states, which in turn is needed for verification of the accuracy of theoretical predictions of high-temperature spectra observed in exoplanets and in combustion environments. Previous implementations of OODR used either continuous wave (cw) lasers, which limit the number of transitions that can be detected, or pulsed lasers, which limit the spectral resolution. Recently, we demonstrated OODR with a cw pump and a frequency comb probe and applied it to the detection and assignment of methane transitions in the 3ν 3 ← ν 3 range with sub-Doppler resolution over 200 cm -1 of bandwidth [1]. The pump [see Fig. 1(a) ] was a 1 W 3.3m idler of a cw optical parametric oscillator (cw-OPO), stabilized to the Lamb dip in a selected CH 4 transition in the ν 3 band using a signal from a reference cell. The probe was an amplified fully-stabilized Er:fiber comb ( f rep = 250 MHz), whose center wavelength was shifted to 1.67m using a soliton self-frequency shift fiber (SSSF). The sample of pure CH 4 was contained in an 80-cm-long single-pass cell cooled by liquid nitrogen. The probe spectra were detected using a Fourier transform spectrometer (FTS) with comb-mode-limited resolution [2] , and the final interleaved spectra had 2 MHz sampling point spacing. Figure 1(b) shows the 3ν 3 ← ν 3 R(1) transition at 6046.36008(5) cm -1 , detected with the pump on the ν 3 R(0) line. We measured, fit and assigned 36 probe transitions with the pump tuned to 9 different transitions. Figure 1(d) shows a comparison of the probe transition wavenumbers to predictions from the TheoReTS database [3] , demonstrating agreement within 1 cm -1. © 2021 IEEE. |
| Databáze: | OpenAIRE |
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