Umeå University's logo

umu.sePublications
Change search
Refine search result
1 - 15 of 15
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    de Oliveira, Vinicius Silva
    et al.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Ruehl, Axel
    Maslowski, Piotr
    Hartl, Ingmar
    Intensity noise optimization of a mid-infrared frequency comb difference-frequency generation source2020In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 45, no 7, p. 1914-1917Article in journal (Refereed)
    Abstract [en]

    We experimentally demonstrate in a difference-frequency generation mid-infrared frequency comb source the effect of temporal overlap between pump and signal pulses on the relative intensity noise (RIN) of the idler pulse. When scanning the temporal delay between our 130 fs long signal and pump pulses, we observe a RIN minimum with a 3 dB width of 20 fs delay and a RIN increase of 20 dB in 40 fs delay at the edges of this minimum. We also demonstrate active long-term stabilization of the mid-infrared frequency comb source to the temporal overlap setting corresponding to the lowest RIN operation point by an online RIN detector and active feedback control of the pump-signal pulse delay. This active stabilization setup allows us to dramatically increase the signal-to-noise ratio of mid-infrared absorption spectra. (C) 2020 Optical Society of America

  • 2.
    Foltynowicz, Aleksandra
    et al.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rutkowski, Lucile
    Université de Rennes, CNRS, IPR (Institut de Physique de Rennes), UMR 6251, Rennes, France.
    Silander, Isak
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Johansson, Alexandra C.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Silva de Oliveira, Vinicius
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Axner, Ove
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Soboń, Grzegorz
    Laser and Fiber Electronics Group, Faculty of Electronics, Wrocław University of Science and Technology, Wroclaw, Poland.
    Martynkien, Tadeusz
    Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wroclaw, Poland.
    Mergo, Paweł
    Laboratory of Optical Fiber Technology, Maria Curie-Sklodowska University, Lublin, Poland.
    Lehmann, Kevin K.
    Departments of Chemistry and Physics, University of Virginia, VA, Charlottesville, United States.
    Measurement and assignment of double-resonance transitions to the 8900-9100- cm-1 levels of methane2021In: Physical Review A: covering atomic, molecular, and optical physics and quantum information, ISSN 2469-9926, E-ISSN 2469-9934, Vol. 103, no 2, article id 022810Article in journal (Refereed)
    Abstract [en]

    Optical-optical double-resonance spectroscopy with a continuous wave pump and frequency comb probe allows measurement of sub-Doppler transitions to highly excited molecular states over a wide spectral range with high frequency accuracy. We report on assessment and characterization of sub-Doppler double-resonance transitions in methane measured using a 3.3-μm continuous wave optical parametric oscillator as a pump and a 1.67-μm frequency comb as a probe. The comb spectra were recorded using a Fourier transform spectrometer with comb-mode-limited resolution. With the pump tuned to nine different transitions in the ν3 fundamental band, we detected 36 ladder-type transitions to the 3ν3 overtone band region, and 18 V-type transitions to the 2ν3 overtone band. We describe in detail the experimental approach and the pump stabilization scheme, which currently limits the frequency accuracy of the measurement. We present the data analysis procedure used to extract the frequencies and intensities of the probe transitions for parallel and perpendicular relative pump-probe polarization. We compare the center frequencies and relative intensities of the ladder-type transitions to theoretical predictions from the TheoReTS and ExoMol line lists, demonstrating good agreement with TheoReTS.

    Download full text (pdf)
    fulltext
  • 3.
    Foltynowicz, Aleksandra
    et al.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rutkowski, Lucile
    Université de Rennes, CNRS, IPR (Institut de Physique de Rennes)-UMR 6251, Rennes, France.
    Silander, Isak
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Johansson, Alexandra C.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Silva de Oliveira, Vinicius
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Axner, Ove
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Soboń, Grzegorz
    Laser and Fiber Electronics Group, Faculty of Electronics, Wrocław University of Science and Technology, Wroclaw, Poland.
    Martynkien, Tadeusz
    Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wroclaw, Poland.
    Mergo, Paweł
    Laboratory of Optical Fiber Technology, Maria Curie-Sklodowska University, Lublin, Poland.
    Lehmann, Kevin K.
    Departments of Chemistry and Physics, University of Virginia, VA, Charlottesville, United States.
    Sub-Doppler Double-Resonance Spectroscopy of Methane Using a Frequency Comb Probe2021In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 126, no 6, article id 063001Article in journal (Refereed)
    Abstract [en]

    We report the first measurement of sub-Doppler molecular response using a frequency comb by employing the comb as a probe in optical-optical double-resonance spectroscopy. We use a 3.3 μm continuous wave pump and a 1.67 μm comb probe to detect sub-Doppler transitions to the 2ν3 and 3ν3 bands of methane with ∼1.7 MHz center frequency accuracy. These measurements provide the first verification of the accuracy of theoretical predictions from highly vibrationally excited states, needed to model the high-temperature spectra of exoplanets. Transition frequencies to the 3ν3 band show good agreement with the TheoReTS line list.

    Download full text (pdf)
    fulltext
  • 4.
    Foltynowicz, Aleksandra
    et al.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rutkowski, Lucile
    Univ Rennes, CNRS, IPR (Institut de Physique de Rennes), UMR 6251, Rennes, France.
    Silander, Isak
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Johansson, Alexandra C.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Silva de Oliveira, Vinicius
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Axner, Ove
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Soboń, Grzegorz
    Laser and Fiber Electronics Group, Faculty of Electronics, Wrocław University of Science and Technology, Wroclaw, Poland.
    Martynkien, Tadeusz
    Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wroclaw, Poland.
    Mergo, Paweł
    Laboratory of Optical Fiber Technology, Maria Curie-Sklodowska University, pl. M. Curie-Sklodowskiej 3, Lublin, Poland.
    Lehmann, Kevin K.
    Departments of Chemistry and Physics, University of Virginia, VA, Charlottesville, United States.
    Sub-doppler double-resonance spectroscopy of methane using a frequency comb probe2020In: Conference on Lasers and Electro-Optics, Optica Publishing Group (formerly OSA) , 2020, article id STu4N.1Conference paper (Refereed)
    Abstract [en]

    We use a 3.3 µm continuous wave optical parametric oscillator as a pump and a 1.67 µm frequency comb as a probe to record 36 sub-Doppler double-resonance transitions in the 3v3 band of methane (including 26 previously unreported) with ~1.5 MHz center frequency accuracy.

  • 5.
    Foltynowicz, Aleksandra
    et al.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rutkowski, Lucile
    Univ Rennes, Cnrs, Ipr Institut de Physique de Rennes-UMR 6251, Rennes, France.
    Silander, Isak
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Johansson, Alexandra C.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Silva de Oliveira, Vinicius
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Axner, Ove
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Soboń, Grzegorz
    Laser AND Fiber Electronics Group, Faculty of Electronics, Wroclaw University of Science and Technology, Wroclaw, Poland.
    Martynkien, Tadeusz
    Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, Wroclaw, Poland.
    Mergo, Paweł
    Laboratory of Optical Fiber Technology, Maria Curie-Sklodowska University, pl. M. Curie-Sklodowskiej 3, Lublin, Poland.
    Lehmann, Kevin K.
    Departments of Chemistry AND Physics, University of Virginia, VA, Charlottesville, United States.
    Sub-doppler double-resonance spectroscopy of methane using a frequency comb probe2020In: 2020 conference on lasers and electro-optics (CLEO): proceedings, IEEE conference proceedings, 2020, article id 9192344Conference paper (Refereed)
    Abstract [en]

    We use a 3.3 μm continuous wave optical parametric oscillator as a pump and a 1.67 μm frequency comb as a probe to record 36 sub-Doppler double-resonance transitions in the 3v3 band of methane (including 26 previously unreported) with ∼1.5 MHz center frequency accuracy.

  • 6.
    Hjältén, Adrian
    et al.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Silva de Oliveira, Vinicius
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rosina, Andrea
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Silander, Isak
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rutkowski, Lucile
    Université de Rennes, CNRS, IPR (Institut de Physique de Rennes)-UMR 6251, Rennes, France..
    Soboń, Grzegorz
    Laser and Fiber Electronics Group, Faculty of Electronics, Photonics and Microsystems, Wrocław University of Science and Technology, Wroclaw, Poland..
    Lehmann, Kevin
    Departments of Chemistry and Physics, University of Virginia, VA, Charlottesville, United States..
    Foltynowicz, Aleksandra
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Accurate measurement and assignment of high rotational energy levels in the 9150 - 9370 cm−1 range of methane using optical frequency comb double-resonance spectroscopyManuscript (preprint) (Other academic)
  • 7.
    Hjältén, Adrian
    et al.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Silva de Oliveira, Vinicius
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Silander, Isak
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rosina, Andrea
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rutkowski, Lucile
    Univ Rennes, CNRS, IPR (Institut de Physique de Rennes), UMR 6251, Rennes, France.
    Sobon, Grzegorz
    Faculty of Electronics, Photonics and Microsystems, Wroclaw University of Science and Technology, Wroclaw, Poland.
    Lehmann, Kevin K.
    Department of Chemistry & Physics, University of Virginia, VA, Charlottesville, United States.
    Foltynowicz, Aleksandra
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Accurate measurement and assignment of high rotational energy levels of the 3v3 ← v3 band of methane2023In: 2023 conference on lasers and electro-optics, CLEO 2023, IEEE, 2023, article id STh4L.4Conference paper (Refereed)
    Abstract [en]

    We use optical-optical double-resonance spectroscopy with a high-power continuous wave pump and a cavity-enhanced comb probe to expand sub-Doppler measurements of the 3v3 ← v3 band of CH4 to higher rotational levels. We assign the final states using combination differences, i.e., by reaching the same state using different pump/probe combinations.

  • 8.
    Silander, Isak
    et al.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Zakrisson, Johan
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Silva de Oliveira, Vinicius
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Forssén, Clayton
    Umeå University, Faculty of Science and Technology, Department of Physics. Measurement Science and Technology, RISE Research Institutes of Sweden, Borås, Sweden.
    Foltynowicz, Aleksandra
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rubin, Tom
    Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany.
    Zelan, Martin
    Measurement Science and Technology, RISE Research Institutes of Sweden, Borås, Sweden.
    Axner, Ove
    Umeå University, Faculty of Science and Technology, Department of Physics.
    In situ determination of the penetration depth of mirrors in Fabry-Perot refractometers and its influence on assessment of refractivity and pressure2022In: Optics Express, E-ISSN 1094-4087, Vol. 30, no 14, p. 25891-25906Article in journal (Refereed)
    Abstract [en]

    A procedure is presented for in situ determination of the frequency penetration depth of coated mirrors in Fabry-Perot (FP) based refractometers and its influence on the assessment of refractivity and pressure. It is based on assessments of the absolute frequency of the laser and the free spectral range of the cavity. The procedure is demonstrated on an Invar-based FP cavity system with high-reflection mirrors working at 1.55 µm. The influence was assessed with such a low uncertainty that it does not significantly contribute to the uncertainties (k = 2) in the assessment of refractivity (<8 × 10−13) or pressure of nitrogen (<0.3 mPa).

    Download full text (pdf)
    fulltext
  • 9.
    Silva de Oliveira, Vinicius
    et al.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Silander, Isak
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rutkowski, Lucile
    Université de Rennes, CNRS, IPR (Institut de Physique de Rennes)-UMR, Rennes, France.
    Johansson, Alexandra C.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Sobon, Grzegorz
    Wrocław University of Science and Technology, Laser Fiber Electronics Group, Faculty of Electronics, Wroclaw, Poland.
    Axner, Ove
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Lehmann, Kevin K.
    University of Virginia, Departments of Chemistry and Physics, VA, Charlottesville, United States.
    Foltynowicz, Aleksandra
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Double-Resonance Spectroscopy of Methane Using a Comb Probe2021In: 2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021, IEEE Lasers and Electro-Optics Society, 2021Conference paper (Refereed)
    Abstract [en]

    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.

  • 10.
    Silva de Oliveira, Vinicius
    et al.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Silander, Isak
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rutkowski, Lucile
    Université de Rennes, CNRS, IPR (Institut de Physique de Rennes)-UMR 6251, Rennes, France.
    Johansson, Alexandra C.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Soboń, Grzegorz
    Laser and Fiber Electronics Group, Faculty of Electronics, Wrocław University of Science and Technology, Wroclaw, Poland.
    Axner, Ove
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Lehmann, Kevin K.
    Department of Chemistry and Physics, University of Virginia, VA, Charlottesville, United States.
    Foltynowicz, Aleksandra
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Sub-doppler optical-optical double-resonance spectroscopy of methane using a frequency comb probe2021In: OSA Optical Sensors and Sensing Congress 2021 (AIS, FTS, HISE, SENSORS, ES), Optical Society of America, 2021, article id JTu6E.2Conference paper (Refereed)
    Abstract [en]

    We use a 3.3 µm high-power continuous wave pump and a 1.67 µm comb probe to detect transitions in the 3ν3 ← ν3 range of methane with sub-Doppler resolution over 6 THz of bandwidth. We achieve high absorption sensitivity for the comb probe using an enhancement cavity and a Fourier transform spectrometer with auto-balanced detection.

  • 11.
    Silva de Oliveira, Vinicius
    et al.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Silander, Isak
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rutkowski, Lucile
    IPR (Institut de Physique de Rennes)-UMR 6251, Univ Rennes, CNRS, Rennes, France.
    Sobon, Grzegorz
    Wroclaw University of Science and Technology, Laser Fiber Electronics Group, Faculty of Electronics, Wroclaw, Poland.
    Axner, Ove
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Lehmann, Kevin K.
    Departments of Chemistry & Physics, University of Virginia, Charlottesville, VA 22904, USA.
    Foltynowicz, Aleksandra
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Optical-optical double-resonance spectroscopy of methane using a cavity-enhanced comb probe2021In: 2021 conference on lasers and electro-optics (CLEO): proceedings, IEEE conference proceedings, 2021Conference paper (Refereed)
    Abstract [en]

    We implement a cavity to enhance the absorption of a frequency comb probe in a double-resonance measurement of sub-Doppler 3ν3 ← ν3 methane transitions. This yields two orders of magnitude better sensitivity in 15 times shorter acquisition time compared to previous work using a single-pass cell.

  • 12.
    Silva de Oliveira, Vinicius
    et al.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Silander, Isak
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rutkowski, Lucile
    Univ Rennes, CNRS, IPR (Institut de Physique de Rennes), Rennes, France.
    Soboń, Grzegorz
    Faculty of Electronics, Photonics and Microsystems, Wrocław University of Science and Technology, Wrocław, Poland.
    Axner, Ove
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Lehmann, Kevin K.
    Departments of Chemistry & Physics, University of Virginia, VA, Charlottesville, USA.
    Foltynowicz, Aleksandra
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Measurement and Assignment of Hot-Band Methane Transitions with Sub-MHz Accuracy2022In: CLEO: 2022: Conference on Lasers and Electro-Optics, Optica Publishing Group , 2022, article id SM3F.7Conference paper (Refereed)
    Abstract [en]

    We use double-resonance spectroscopy with cavity-enhanced comb probe to measure sub-Doppler transitions in the 3ν3←ν3 band of CH4. We assign the final states using different pump/probe combinations reaching the same state, and the dependence of line intensities on relative pump/probe polarization.

  • 13.
    Silva de Oliveira, Vinicius
    et al.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Silander, Isak
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rutkowski, Lucile
    Univ Rennes, CNRS, IPR (Institut de Physique de Rennes), UMR 6251, Rennes, France.
    Soboń, Grzegorz
    Laser and Fiber Electronics Group, Faculty of Electronics, Wrocław University of Science and Technology, Wroclaw, Poland.
    Axner, Ove
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Lehmann, Kevin K.
    Department of Chemistry and Physics, University of Virginia, VA, Charlottesville, United States.
    Foltynowicz, Aleksandra
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Optical-optical double-resonance spectroscopy of methane using a cavity-enhanced comb probe2021In: OSA Technical Digest, Optical Society of America, 2021, article id SM1C.3Conference paper (Refereed)
    Abstract [en]

    We implement a cavity to enhance the absorption of a frequency comb probe in a double-resonance measurement of sub-Doppler 3ν3 ← ν3 methane transitions. This yields two orders of magnitude better sensitivity in 15 times shorter acquisition time compared to previous work using a single-pass cell.

  • 14.
    Silva de Oliveira, Vinicius
    et al.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Silander, Isak
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rutkowski, Lucile
    University of Rennes, CNRS, IPR (Institut de Physique de Rennes)-UMR 6251, Rennes, France.
    Soboń, Grzegorz
    Faculty of Electronics, Photonics and Microsystems, Wrocław University of Science and Technology, Wrocław, Poland.
    Axner, Ove
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Lehmann, Kevin K.
    Departments of Chemistry & Physics, University of Virginia, VA, Charlottesville, United States.
    Foltynowicz, Aleksandra
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Sub-Doppler optical-optical double-resonance spectroscopy using a cavity-enhanced frequency comb probe2024In: Nature Communications, E-ISSN 2041-1723, Vol. 15, no 1, article id 161Article in journal (Refereed)
    Abstract [en]

    Accurate parameters of molecular hot-band transitions, i.e., those starting from vibrationally excited levels, are needed to accurately model high-temperature spectra in astrophysics and combustion, yet laboratory spectra measured at high temperatures are often unresolved and difficult to assign. Optical-optical double-resonance (OODR) spectroscopy allows the measurement and assignment of individual hot-band transitions from selectively pumped energy levels without the need to heat the sample. However, previous demonstrations lacked either sufficient resolution, spectral coverage, absorption sensitivity, or frequency accuracy. Here we demonstrate OODR spectroscopy using a cavity-enhanced frequency comb probe that combines all these advantages. We detect and assign sub-Doppler transitions in the spectral range of the 3ν3 ← ν3 resonance of methane with frequency precision and sensitivity more than an order of magnitude better than before. This technique will provide high-accuracy data about excited states of a wide range of molecules that is urgently needed for theoretical modeling of high-temperature data and cannot be obtained using other methods.

    Download full text (pdf)
    fulltext
  • 15.
    Zakrisson, Johan
    et al.
    Umeå University, Faculty of Science and Technology, Department of Physics. Measurement Science and Technology, RISE Research Institutes of Sweden, Borås, Sweden.
    Silander, Isak
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Silva de Oliveira, Vinicius
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Hjältén, Adrian
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rosina, Andrea
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Rubin, Tom
    Physikalisch-Technische Bundesanstalt (PTB), Abbestr 2-12, Berlin, Germany.
    Foltynowicz, Aleksandra
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Zelan, Martin
    Measurement Science and Technology, RISE Research Institutes of Sweden, Borås, Sweden.
    Axner, Ove
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Procedure for automated low uncertainty assessment of empty cavity mode frequencies in Fabry-Pérot cavity based refractometry2024In: Optics Express, E-ISSN 1094-4087, Vol. 32, no 3, p. 3959-3973Article in journal (Refereed)
    Abstract [en]

    A procedure for automated low uncertainty assessment of empty cavity mode frequencies in Fabry-Pérot cavity based refractometry that does not require access to laser frequency measuring instrumentation is presented. It requires a previously well-characterized system regarding mirror phase shifts, Gouy phase, and mode number, and is based on the fact that the assessed refractivity should not change when mode jumps take place. It is demonstrated that the procedure is capable of assessing mode frequencies with an uncertainty of 30 MHz, which, when assessing pressure of nitrogen, corresponds to an uncertainty of 0.3 mPa.

    Download full text (pdf)
    fulltext
1 - 15 of 15
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf