Double resonant absorption measurement of acetylene symmetric vibrational states probed with cavity ring down spectroscopy

Karhu, Juho; Nauta, Janko; Vainio, Markku; Metsälä, Markus; Hoekstra, Steven; Halonen, Lauri

doi:10.1063/1.4954159

Cited by 12 publications

(7 citation statements)

References 32 publications

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“…With the frequency comb assisted measurement, we could resolve the shape of the sub-Doppler transition line, which was not achieved in our previous measurement with free running lasers, and precision of the line position measurement was increased by an order of magnitude [3]. The SNR was also improved by an order of magnitude compared to when the light sources were free-running, and by an order of two compared to a measurement of the same state with previously the best sensitivity [2].…”

Section: Discussionmentioning

confidence: 82%

“…The total energy of the final rovibrational state, calculated as the sum of the two measured transition line centers and the rotational energy of the ground state [38], is 10059.186015 (31) cm -1 , where the precision is mostly limited by the uncertainty in the ground state rotational parameters. Previously measured effective band parameters of the final symmetric vibrational state predict the state energy to be 10059.1876 (10) cm -1 [3]. The measurement results are summarized in table 1.…”

Section: Resultsmentioning

confidence: 88%

“…Spectroscopy methods based on stimulated two-photon transitions, such as two-photon absorption, stimulated emission probing, and stimulated Raman spectroscopy, allow accessing energy states in which typical single photon excitations are forbidden under spectroscopic selection rules [1][2][3]. Stimulated two-photon transition can be used to measure spectral features at sub-Doppler resolution, without the need for cooling or molecular jets [4].…”

Section: Introductionmentioning

confidence: 99%

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Frequency comb assisted two-photon vibrational spectroscopy

et al. 2017

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We report a setup for high-resolution two-photon spectroscopy using a mid-infrared continuous wave optical parametric oscillator (CW-OPO) and a near-infrared diode laser as the excitation sources, both of which are locked to fully stabilized optical frequency combs. The diode laser is directly locked to a commercial near-infrared optical frequency comb using an optical phaselocked loop. The near-infrared frequency comb is also used to synchronously pump a degenerate femtosecond optical parametric oscillator to produce a fully stabilized mid-infrared frequency comb. The beat frequency between the mid-infrared comb and the CW-OPO is then stabilized through frequency locking. We used the setup to measure a double resonant twophoton transition to a symmetric vibrational state of acetylene with a sub-Doppler resolution and high signal-to-noise ratio.© 2017 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited. Bartalini, and P. De Natale, "Subkilohertz linewidth room-temperature mid-infrared quantum cascade laser using a molecular sub-Doppler reference," Opt. Lett. 37(23), 4811-4813 (2012). 9.

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Section: Discussionmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Frequency comb assisted two-photon vibrational spectroscopy

et al. 2017

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“…24 In addition, we have developed a two-photon method, which combines two OFC-stabilized sources -a CW-SRO and a near-infrared diode laser -for Doppler-free molecular spectroscopy. 26,30 This new method gives access to vibrational energy states that are inaccessible directly by single-photon absorption. As an example, we have accurately determined energy levels of symmetric vibrational states of acetylene, C2H2.…”

Section: Application Examplesmentioning

confidence: 99%

Continuous-wave optical parametric oscillators for mid-infrared spectroscopy

Vainio¹

2020

Nonlinear Frequency Generation and Conversion: Materials and Devices XIX

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The atmospheric window at 3 to 5 µm is one of the most important spectral regions for molecular spectroscopy. This region accommodates strong fundamental vibrational spectra of several interesting molecules, including species relevant for air quality monitoring, medical diagnostics, and fundamental research. These applications require excellent spectroscopic sensitivity and selectivity. For example, atmospheric research often needs precise quantification of trace gas fractions of down to the parts-per-trillion level (10 -12 ), with the capability of resolving individual spectral features of different molecular compounds. This sets stringent requirements for the light source of the spectrometer in terms of output power, noise, and linewidth. In addition, the wavelength tuning range of the light source needs to be large, preferably over the entire atmospheric window, in order to enable measurements of molecular fingerprints of several compounds. Continuous-wave optical parametric oscillators (CW-OPOs) are one of the few light sources that have the potential of combining all these favorable characteristics. This contribution summarizes our progress in the development of CW-OPOs, with an emphasis on precise frequency control methods for high-resolution molecular spectroscopy. Examples of new applications enabled by the advanced CW-OPO technologies will be presented. These examples include a demonstration of world-record detection sensitivity in trace gas analysis, as well as the first characterization of infrared spectrum of radioactive methane 14 CH4.

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“…Therefore, the requirements of higher accuracy and better real-time performance are put forward to improving the measurement system. It is very meaningful when applied to the cavity ring-down spectroscopy to detect trace gases, and can more accurately reflect the change of the measured gas concentration in the ring-down cavity [12,13,14,15,16]. In the measurement of the resonant cavity loss, the resonant cavity can be adjusted in real-time, which can reduce the loss of the resonant cavity and improve the yield and excellent rate of the resonant cavity efficiently [17,18,19].…”

Section: Introductionmentioning

confidence: 99%