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Rutkowski, Lucile
Publications (10 of 24) Show all publications
Rutkowski, L., Foltynowicz, A., Schmidt, F. M., Johansson, A. C., Khodabakhsh, A., Kyuberis, A. A., . . . Tennyson, J. (2018). An experimental water line list at 1950 K in the 6250–6670 cm−1 region. Journal of Quantitative Spectroscopy and Radiative Transfer, 205, 213-219
Open this publication in new window or tab >>An experimental water line list at 1950 K in the 6250–6670 cm−1 region
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2018 (English)In: Journal of Quantitative Spectroscopy and Radiative Transfer, ISSN 0022-4073, E-ISSN 1879-1352, Vol. 205, p. 213-219Article in journal (Refereed) Published
Abstract [en]

An absorption spectrum of (H2O)-O-16 at 1950 K is recorded in a premixed methane/air flat flame using a cavity-enhanced optical frequency comb-based Fourier transform spectrometer. 2417 absorption lines are identified in the 6250-6670 cm(-1) region with an accuracy of about 0.01 cm(-1). Absolute line intensities are retrieved using temperature and concentration values obtained by tunable diode laser absorption spectroscopy. Line assignments are made using a combination of empirically known energy levels and predictions from the new POKAZATEL variational line list. 2030 of the observed lines are assigned to 2937 transitions, once blends are taken into account. 126 new energy levels of (H2O)-O-16 are identified. The assigned transitions belong to 136 bands and span rotational states up to J = 27.

Keywords
Water, Absorption, Fourier transform spectroscopy, Optical cavity, Frequency comb, Calculations
National Category
Atom and Molecular Physics and Optics Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:umu:diva-141519 (URN)10.1016/j.jqsrt.2017.10.016 (DOI)000417665000023 ()
Available from: 2017-11-06 Created: 2017-11-06 Last updated: 2018-06-09Bibliographically approved
Johansson, A. C., Rutkowski, L., Filipsson, A., Hausmaninger, T., Zhao, G., Axner, O. & Foltynowicz, A. (2018). Broadband calibration-free cavity-enhanced complex refractive index spectroscopy using a frequency comb. Optics Express, 26(16), 20633-20648
Open this publication in new window or tab >>Broadband calibration-free cavity-enhanced complex refractive index spectroscopy using a frequency comb
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2018 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 26, no 16, p. 20633-20648Article in journal (Refereed) Published
Abstract [en]

We present broadband cavity-enhanced complex refractive index spectroscopy (CE-CRIS), a technique for calibration-free determination of the complex refractive index of entire molecular bands via direct measurement of transmission modes of a Fabry-Perot cavity filled with the sample. The measurement of the cavity transmission spectrum is done using an optical frequency comb and a mechanical Fourier transform spectrometer with sub-nominal resolution. Molecular absorption and dispersion spectra (corresponding to the imaginary and real parts of the refractive index) are obtained from the cavity mode broadening and shift retrieved from fits of Lorentzian profiles to the individual cavity modes. This method is calibration-free because the mode broadening and shift are independent of the cavity parameters such as the length and mirror reflectivity. In this first demonstration of broadband CE-CRIS we measure simultaneously the absorption and dispersion spectra of three combination bands of CO2 in the range between 1525 nm and 1620 nm and achieve good agreement with theoretical models. This opens up for precision spectroscopy of the complex refractive index of several molecular bands simultaneously. 

Place, publisher, year, edition, pages
Optical Society of America, 2018
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-151397 (URN)10.1364/OE.26.020633 (DOI)000440803600079 ()30119372 (PubMedID)
Funder
Swedish Research Council, 2016-03593Swedish Research Council, 2015-04374Knut and Alice Wallenberg Foundation, KAW 2015.0159
Available from: 2018-09-04 Created: 2018-09-04 Last updated: 2018-11-13Bibliographically approved
Johansson, A. C., Filipsson, A., Rutkowski, L., Maslowski, P. & Foltynowicz, A. (2018). CO2 Line Parameter Retrieval Beyond the Voigt Profile Using Comb-Based Fourier Transform Spectroscopy. In: Conference on Lasers and Electro-Optics: . Paper presented at Conference on Lasers and Electro-Optics (CLEO, Science and innovations), San Jose, CA, USA, May 13-18, 2018.. Optical Society of America
Open this publication in new window or tab >>CO2 Line Parameter Retrieval Beyond the Voigt Profile Using Comb-Based Fourier Transform Spectroscopy
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2018 (English)In: Conference on Lasers and Electro-Optics, Optical Society of America, 2018Conference paper, Published paper (Refereed)
Abstract [en]

We measure absorption spectra of the CO213 band at 1.57 μm using optical frequency comb Fourier transform spectroscopy with sub-nominal resolution and retrieve line shape parameters using multiline fitting with the speed-dependent Voigt profile.

Place, publisher, year, edition, pages
Optical Society of America, 2018
Series
OSA Technical Digest
Keywords
Spectroscopy, Fourier transforms (300.6300), Absorption (300.1030), Line shapes and shifts (020.3690).
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-153175 (URN)10.1364/CLEO_SI.2018.STu3P.6 (DOI)
Conference
Conference on Lasers and Electro-Optics (CLEO, Science and innovations), San Jose, CA, USA, May 13-18, 2018.
Funder
Knut and Alice Wallenberg Foundation, KAW 2015.0159Swedish Research Council, 2016-03593
Note

Paper STu3P.6

Available from: 2018-11-12 Created: 2018-11-12 Last updated: 2018-11-14Bibliographically approved
Rutkowski, L., Masłowski, P., Johansson, A. C., Khodabakhsh, A. & Foltynowicz, A. (2018). Optical frequency comb Fourier transform spectroscopy with sub-nominal resolution and precision beyond the Voigt profile. Journal of Quantitative Spectroscopy and Radiative Transfer, 204, 63-73
Open this publication in new window or tab >>Optical frequency comb Fourier transform spectroscopy with sub-nominal resolution and precision beyond the Voigt profile
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2018 (English)In: Journal of Quantitative Spectroscopy and Radiative Transfer, ISSN 0022-4073, E-ISSN 1879-1352, Vol. 204, p. 63-73Article in journal (Refereed) Published
Abstract [en]

Broadband precision spectroscopy is indispensable for providing high fidelity molecular parameters for spectroscopic databases. We have recently shown that mechanical Fourier transform spectrometers based on optical frequency combs can measure broadband high-resolution molecular spectra undistorted by the instrumental line shape (ILS) and with a highly precise frequency scale provided by the comb. The accurate measurement of the power of the comb modes interacting with the molecular sample was achieved by acquiring single-burst interferograms with nominal resolution matched to the comb mode spacing. Here we describe in detail the experimental and numerical steps needed to achieve sub-nominal resolution and retrieve ILS-free molecular spectra, i.e. with ILS-induced distortion below the noise level. We investigate the accuracy of the transition line centers retrieved by fitting to the absorption lines measured using this method. We verify the performance by measuring an ILS-free cavity-enhanced low-pressure spectrum of the 3ν1 + ν3 band of CO2 around 1575 nm with line widths narrower than the nominal resolution. We observe and quantify collisional narrowing of absorption line shape, for the first time with a comb-based spectroscopic technique. Thus retrieval of line shape parameters with accuracy not limited by the Voigt profile is now possible for entire absorption bands acquired simultaneously.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Optical frequency combs, Fourier transform spectroscopy, High resolution spectroscopy, Line shapes
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-142443 (URN)10.1016/j.jqsrt.2017.09.001 (DOI)000414880500009 ()
Available from: 2017-12-06 Created: 2017-12-06 Last updated: 2018-11-13Bibliographically approved
Rutkowski, L., Johansson, A. C., Khodabakhsh, A. & Foltynowicz, A. (2017). Broadband and High Resolution Direct Measurement of Cavity Resonances. In: 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC): . Paper presented at Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), JUN 25-29, 2017, Munich, GERMANY. IEEE
Open this publication in new window or tab >>Broadband and High Resolution Direct Measurement of Cavity Resonances
2017 (English)In: 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), IEEE, 2017Conference paper, Published paper (Refereed)
Abstract [en]

Summary form only given. Optical frequency combs offer unprecedented combination of broad bandwidth and high resolution and their coupling to enhancement cavities provides high sensitivity for spectroscopic measurements. Here we use a frequency-comb-based Fourier transform spectrometer (FTS) to measure the narrow resonances of a high-finesse cavity over a bandwidth of 100 nm around 1.55 μm and derive the group delay dispersion (GDD) of the cavity mirrors with precision below 1 fs 2 from the cavity resonance frequencies. We do this using a method that allows precise sampling of the comb intensities using an FTS with nominal resolution matched to the comb repetition rate (f rep ) [1, 2], and we demonstrate that sub-MHz resolution is achieved.

Place, publisher, year, edition, pages
IEEE, 2017
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-152157 (URN)10.1109/CLEOE-EQEC.2017.8087461 (DOI)000432564601222 ()978-1-5090-6736-7 (ISBN)
Conference
Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), JUN 25-29, 2017, Munich, GERMANY
Funder
Swedish Research Council, 2016-03593Swedish Foundation for Strategic Research , ICA12-0031Knut and Alice Wallenberg Foundation, KAW 2015.0159
Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2018-10-01Bibliographically approved
Khodabakhsh, A., Rutkowski, L., Morville, J., Johansson, A. C., Soboń, G. & Foltynowicz, A. (2017). Cavity-Enhanced Continuous-Filtering Vernier Spectroscopy at 3.3 mu m using a Femtosecond Optical Parametric Oscillator. In: 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC): . Paper presented at 2017 European Conference on Lasers and Electro-Optics and European Quantum Electronics Conference, Munich Germany, 25–29 June 2017 (pp. CH_2_2). IEEE
Open this publication in new window or tab >>Cavity-Enhanced Continuous-Filtering Vernier Spectroscopy at 3.3 mu m using a Femtosecond Optical Parametric Oscillator
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2017 (English)In: 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC), IEEE , 2017, p. CH_2_2-Conference paper, Published paper (Refereed)
Abstract [en]

Optical frequency comb spectroscopy in the mid-infrared fingerprint region combines broad spectral bandwidth with high detection sensitivity and allows simultaneous detection of trace amounts of many molecular species. We have recently demonstrated a continuous-filtering Vernier spectrometer based on a mid-infrared optical frequency comb and an enhancement cavity for fast and sensitive detection of CH4 [1]. Here we present an improved, fully automatized and frequency calibrated continuous-filtering Vernier spectrometer, schematically shown in Fig. 1(a). The comb source is a doubly resonant optical parametric oscillator (DROPO) based on an orientation-patterned GaAs crystal synchronously pumped by a Tm:fiber femtosecond laser (125 MHz repetition rate, frep). The signal comb (3.1–3.4 µm, 30 mW) is mode matched to a 60-cm long Vernier enhancement cavity with a finesse of ~350 at 3.25 μm, placed in an enclosure that can be filled with the gas sample. The output mirror is attached to a PZT and mounted on a translation stage. When the cavity free spectral range is perfectly matched to twice the frep (250 MHz) every other signal comb mode is transmitted through the cavity. By detuning the cavity length from this perfect match position the cavity resonances act as a filter and transmit groups of comb modes called Vernier orders [2]. A diffraction grating mounted on a galvo-scanner separates these orders after the cavity and the chosen order is sent to the detection system. The Vernier order is tuned across the signal comb spectrum by scanning the cavity length (at 20 Hz) and the grating is rotated synchronously to fix the order in space and allow acquisition of the entire spectrum in 25 ms. Any residual mismatch between the cavity length scan and the grating rotation is compensated by a feedback loop acting on the frep of the pump laser and the PZT of the Vernier cavity [2]. A Fabry-Perot etalon is used for frequency calibration of the spectrometer. Figure 1(b) shows in black the normalized transmission spectrum of a sample containing 5.0 ppm CH4 and 160 ppm water. The red and blue curves show the corresponding fit of the Vernier spectrum [3] of CH4 and water, respectively, calculated using Voigt profiles, line parameters from the HITRAN database, and the experimentally determined cavity finesse. The figure of merit of the spectrometer is 1×10−9cm−1 Hz−1∕2 per spectral element and multiline fitting yields minimum detectable concentration of CH4 of 2 ppb in 25 ms, translating into 400 ppt Hz−1∕2 Since the spectrum of the signal comb covers the fundamental C-H stretch transitions we expect low detection limits for other hydrocarbons as well. In conclusion, mid-infrared comb-based continuous-filtering Vernier spectroscopy allows fast and highly sensitive measurement of broadband absorption spectra using a robust and compact detection system.

Place, publisher, year, edition, pages
IEEE, 2017
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-155053 (URN)000432564600616 ()978-1-5090-6736-7 (ISBN)
Conference
2017 European Conference on Lasers and Electro-Optics and European Quantum Electronics Conference, Munich Germany, 25–29 June 2017
Available from: 2019-01-07 Created: 2019-01-07 Last updated: 2019-01-07Bibliographically approved
Rutkowski, L. & Morville, J. (2017). Continuous Vernier filtering of an optical frequency comb for broadband cavity-enhanced molecular spectroscopy. Journal of Quantitative Spectroscopy and Radiative Transfer, 187, 204-214
Open this publication in new window or tab >>Continuous Vernier filtering of an optical frequency comb for broadband cavity-enhanced molecular spectroscopy
2017 (English)In: Journal of Quantitative Spectroscopy and Radiative Transfer, ISSN 0022-4073, E-ISSN 1879-1352, Vol. 187, p. 204-214Article in journal (Refereed) Published
Abstract [en]

We have recently introduced the Vernier-based Direct Frequency Comb Cavity-Enhanced Spectroscopy technique which allows us to record broadband spectra at high sensitivity and GHz resolution (Rutkowski and Morville, 2014) [1]. We discuss here the effect of Vernier filtering on the observed lineshapes in the 3v+delta band of water vapor and the entire A-band of oxygen around 800 nm in ambient air. We derive expressions for the absorption profiles resulting from the continuous Vernier filtering method, testing them on spectra covering more than 2000 cm(-1) around 12,500 cm(-1). With 31,300 independent spectral elements acquired at the second time scale, an absorption baseline noise of 2 x 10(-8) cm(-1) is obtained, providing a figure of merit of 1.1 x 10(-10) cm(-1)/root Hz per spectral element with a cavity finesse of 3000 and a cavity round-trip length around 3.3 m. 

Keywords
Optical frequency comb, Optical cavity, Spectroscopy
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-132033 (URN)10.1016/j.jqsrt.2016.09.021 (DOI)000391899300020 ()
Available from: 2017-03-28 Created: 2017-03-28 Last updated: 2018-06-09Bibliographically approved
Khodabakhsh, A., Rutkowski, L., Morville, J., Johansson, A. C., Soboń, G. & Foltynowicz, A. (2017). Continuous-Filtering Vernier Spectroscopy at 3.3 mu m Using a Femtosecond Optical Parametric Oscillator. In: 2017 conference on lasers and elecro-optics (CLEO): Science and innovations. Paper presented at Conference on Lasers and Electro-Optics (CLEO), MAY 14-19, 2017, San Jose, CA. IEEE, Article ID SW1L.5.
Open this publication in new window or tab >>Continuous-Filtering Vernier Spectroscopy at 3.3 mu m Using a Femtosecond Optical Parametric Oscillator
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2017 (English)In: 2017 conference on lasers and elecro-optics (CLEO): Science and innovations, IEEE , 2017, article id SW1L.5Conference paper, Published paper (Refereed)
Abstract [en]

Using a cavity-enhanced continuous-filtering Vernier spectrometer based on a femtosecond optical parametric oscillator we measure broadband spectra of atmospheric water and CH4 around 3.3 mu m reaching 4 ppb detection limit for CH4 in 15 ms.

Place, publisher, year, edition, pages
IEEE, 2017
Series
Conference on Lasers and Electro-Optics, ISSN 2160-9020
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-146824 (URN)10.1364/CLEO_SI.2017.SW1L.5 (DOI)000427296203060 ()978-1-9435-8027-9 (ISBN)
Conference
Conference on Lasers and Electro-Optics (CLEO), MAY 14-19, 2017, San Jose, CA
Available from: 2018-04-23 Created: 2018-04-23 Last updated: 2018-06-09Bibliographically approved
Rutkowski, L., Johansson, A. C., Khodabakhsh, A., Valiev, D., Lodi, L., Yurchenko, S., . . . Foltynowicz, A. (2017). Detection of OH and H2O in an Atmospheric Flame by Near-Infrared Optical Frequency Comb Spectroscopy. In: 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC): . Paper presented at Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), JUN 25-29, 2017, Munich, GERMANY. IEEE
Open this publication in new window or tab >>Detection of OH and H2O in an Atmospheric Flame by Near-Infrared Optical Frequency Comb Spectroscopy
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2017 (English)In: 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), IEEE, 2017Conference paper, Published paper (Refereed)
Abstract [en]

Absorption spectroscopy is attractive for combustion diagnostics because it allows in-situ and calibration-free quantification of reactants/products and thermometry. However, spectra measured at atmospheric pressure in the near-infrared telecom range, where laser sources and optical components are readily available, suffer from strong water interference. Cavity-enhanced optical frequency comb spectroscopy (CE-OFCS) is well suited for detection of other species, as it provides broad bandwidth with high signal-to-noise ratio and resolution, and allows de-convolving the spectra hidden among water transitions. Here we report detection of OH in the presence of H2O in an atmospheric premixed methane/air flat flame by CE-OFCS at 1.57 μm. We demonstrate a new water line list that is more accurate than HITEMP [1] and we isolate the OH lines by dividing spectra taken at different heights above the burner (HABs) to retrieve OH concentration and flame temperature.

Place, publisher, year, edition, pages
IEEE, 2017
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-152156 (URN)10.1109/CLEOE-EQEC.2017.8086912 (DOI)000432564600671 ()978-1-5090-6736-7 (ISBN)
Conference
Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), JUN 25-29, 2017, Munich, GERMANY
Funder
Swedish Research Council, 621-2012-3650Swedish Foundation for Strategic Research , ICA12-0031Knut and Alice Wallenberg Foundation, KAW 2015.0159
Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2018-10-01Bibliographically approved
Johansson, A. C., Westberg, J., Khodabakhsh, A., Rutkowski, L., Wysocki, G. & Foltynowicz, A. (2017). Faraday Rotation Spectroscopy Using an Optical Frequency Comb. In: 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC): . Paper presented at Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), JUN 25-29, 2017, Munich, GERMANY. IEEE
Open this publication in new window or tab >>Faraday Rotation Spectroscopy Using an Optical Frequency Comb
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2017 (English)In: 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), IEEE, 2017Conference paper, Published paper (Refereed)
Abstract [en]

Summary form only given. The mid-infrared (MIR) part of the optical spectrum (3-12 μm) houses the fundamental absorption bands of a multitude of environmentally important molecules, but the abundance of water absorption often causes interference with the target species and makes concentration measurement inaccurate. The broad spectral coverage of optical frequency comb spectroscopy (OFCS) provides access to entire ro-vibrational bands and allows more accurate concentration quantification and retrieval of sample temperature. To further improve detection sensitivity of paramagnetic species in the presence of interfering species, we combine a MIR optical frequency comb with the Faraday rotation spectroscopy (FRS) technique [I], which is insensitive to interferences from diamagnetic molecules, such as H 2 O, CO 2 , and CO. In FRS, the rotation of the polarization induced by an external magnetic field in the vicinity of paramagnetic molecular transitions is translated to an intensity change by the use of a polarization analyzer, which effectively removes the influence of any non-paramagnetic species. In the proof of principle demonstration of OFC-FRS we detect nitric oxide (NO) in the presence of water at 5.3 μm using a Fourier transform spectrometer.

Place, publisher, year, edition, pages
IEEE, 2017
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-152153 (URN)10.1109/CLEOE-EQEC.2017.8086909 (DOI)000432564600668 ()978-1-5090-6736-7 (ISBN)
Conference
Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), JUN 25-29, 2017, Munich, GERMANY
Funder
Swedish Foundation for Strategic Research , ICA12-0031Knut and Alice Wallenberg Foundation, KAW 2015.0159
Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2018-10-01Bibliographically approved
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