Single-beam coherent anti-Stokes Raman scattering spectroscopy of N2 using a shaped 7 fs laser pulse

Roy, Sukesh; Wrzesinski, Paul J.; Pestov, Dmitry; Gunaratne, Tissa C.; Dantus, Marcos; Gord, James R.

doi:10.1063/1.3207829

Cited by 63 publications

(34 citation statements)

References 15 publications

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“…This successful demonstra- tion experiment opens new possibilities for probing individual aerosol particles, namely femtosecond LIBS (Laser Induced Breakdown Spectroscopy) [24,25], femtosecond pump-probe approaches that exploit differences in excited states dynamics [13,14], coherent control of molecular wavepackets that proved able of discriminating molecules with identical linear spectra [16,17], and femtosecond CARS (Coherent Anti-Stokes Raman Scattering) [26][27][28][29] that makes use of identified vibrational signatures.…”

Section: Resultsmentioning

confidence: 99%

Individual bioaerosol particle discrimination by multi-photon excited fluorescence

Kiselev¹,

Bonacina²,

Wolf³

2011

Opt. Express

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Femtosecond laser induced multi-photon excited fluorescence (MPEF) from individual airborne particles is tested for the first time for discriminating bioaerosols. The fluorescence spectra, analysed in 32 channels, exhibit a composite character originating from simultaneous two-photon and three-photon excitation at 790 nm. Simulants of bacteria aggregates (clusters of dyed polystyrene microspheres) and different pollen particles (Ragweed, Pecan, Mulberry) are clearly discriminated by their MPEF spectra. This demonstration experiment opens the way to more sophisticated spectroscopic schemes like pump-probe and coherent control. Fundamental developments and applications in reacting flows," Prog. Energ. Combust. 36, 280-306 (2010).

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Section: Resultsmentioning

confidence: 99%

Individual bioaerosol particle discrimination by multi-photon excited fluorescence

Kiselev¹,

Bonacina²,

Wolf³

2011

Opt. Express

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“…We have recently demonstrated the utility of this approach for detecting gas-phase N 2 molecule. [30] In the present study, we explore the feasibility of performing single-shot CARS spectroscopy of CO 2 where the Fermi dyads of CO 2 at ∼1285 and ∼1388 cm −1 are simultaneously excited using a shaped 7-fs laser beam. [31 -34] Moreover, the use of the CARS signal-intensity ratios between the bands of the Fermi dyads for measuring local pressure in dynamic, chemically reacting environments, such as pulsed-detonation engines (PDEs) or hypersonic flows, is also discussed.…”

Section: Introductionmentioning

confidence: 99%

Single‐beam coherent anti‐Stokes Raman scattering (CARS) spectroscopy of gas‐phase CO₂ via phase and polarization shaping of a broadband continuum

Roy¹,

Wrzesinski²,

Pestov³

et al. 2010

J Raman Spectroscopy

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Coherent anti-Stokes Raman scattering (CARS) spectroscopy of gas-phase CO 2 is demonstrated using a single femtosecond (fs) laser beam. A shaped ultrashort laser pulse with a transform-limited temporal width of ∼7 fs and spectral bandwidth of ∼225 nm (∼3500 cm −1 ) is employed for simultaneous excitation of the CO 2 Fermi dyads at ∼1285 and ∼1388 cm −1 . CARS signal intensities for the two Raman transitions and their ratio as a function of pressure are presented. The signal-to-noise ratio of the single beam-generated CO 2 CARS signal is sufficient to perform concentration measurements at a rate of 1 kHz. The implications of these experiments for measuring CO 2 concentrations and rapid pressure fluctuations in hypersonic and detonation-based chemically reacting flows are also discussed.

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“…Coherent transient signals such as those generated by shaped ultrashort pulses may also lead to deviations from N 2 behaviour [173]. A LIGS signal can be created even in the absence of a molecular absorption since nonresonant light, of sufficient intensity, may also modulate the refractive index by the phenomenon of electrostriction [177].…”

Section: Concentration Measurements and Thermometry Applicationsmentioning

confidence: 99%

Laser diagnostics and minor species detection in combustion using resonant four-wave mixing

Kiefer

Ewart

2011

Progress in Energy and Combustion Science

129

112

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Laser-based methods have transformed combustion diagnostics in the past few decades. The high intensity, coherence, high spectral resolution and frequency tunability available from laser radiation has provided powerful tools for studying microscopic processes and macroscopic phenomena in combustion by linear and nonlinear optical processes. This review focuses on nonlinear optical techniques based on resonant four-wave mixing for non-intrusive measurements of minor species in combustion. The importance of minor species such as reaction intermediates is outlined together with the challenges they present for detection and measurement in the hostile environments of flames, technical combustors, and engines. The limitations of conventional optical methods for such measurements are described and the particular advantages of coherent methods using nonlinear optical techniques are discussed.The basic physics underlying four-wave wave mixing processes and theoretical models for signal calculation are then presented together with a discussion of how combustion parameters may be derived from analysis of signals generated in various four-wave mixing processes. The most important four-wave mixing processes, in this context, are then reviewed:Degenerate Four-Wave Mixing (DFWM), Coherent Anti-Stokes Raman Scattering (CARS), Laser Induced Grating Spectroscopy (LIGS) and Polarization Spectroscopy (PS). In each case the fundamental physics is outlined to explain the particular properties and diagnostic advantages of each technique. The application of the methods mentioned to molecular physics studies of combustion species is then reviewed along with their application in measurement of concentration, temperature and other combustion parameters. Related nonlinear techniques and recent extensions to the ultra-fast regime are briefly reviewed. Finally practical considerations relevant to multi-dimensional and multi-species measurements, as well as applications in technical combustion systems are discussed.Keywords: nonlinear optical spectroscopy, four-wave mixing, combustion diagnostics, minor species detection, laser-induced gratings, polarization spectroscopy IntroductionEnergy from renewable sources such as solar and wind power is the goal of much current research and technological development. Combustion, however, is and is likely to remain for the foreseeable future, the most important energy source for heat, electrical power and especially for transportation. In technical combustion systems the chemical energy of fossil fuels such as coal, crude oil and natural gas is converted into heat through oxidation with oxygen from air. However, fossil fuel resources are limited and alternatives like biofuels [1] or novel technologies such as fuel cells [2] are not yet able to meet the demand. Consequently, for a sustainable use of fossil fuels it is desirable to further improve the efficiency, maintainability and reliability of existing combustion devices. Achieving such improvements depends upon an improved understanding of t...

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Single-beam coherent anti-Stokes Raman scattering spectroscopy of N2 using a shaped 7 fs laser pulse

Abstract: Single-beam coherent anti-Stokes Raman scattering spectroscopy of using a shaped 7 fs laser pulse

Cited by 63 publications

References 15 publications

Individual bioaerosol particle discrimination by multi-photon excited fluorescence

Individual bioaerosol particle discrimination by multi-photon excited fluorescence

Single‐beam coherent anti‐Stokes Raman scattering (CARS) spectroscopy of gas‐phase CO₂ via phase and polarization shaping of a broadband continuum

Laser diagnostics and minor species detection in combustion using resonant four-wave mixing

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Single-beam coherent anti-Stokes Raman scattering spectroscopy of N2 using a shaped 7 fs laser pulse

Abstract: Single-beam coherent anti-Stokes Raman scattering spectroscopy of using a shaped 7 fs laser pulse

Cited by 63 publications

References 15 publications

Individual bioaerosol particle discrimination by multi-photon excited fluorescence

Individual bioaerosol particle discrimination by multi-photon excited fluorescence

Single‐beam coherent anti‐Stokes Raman scattering (CARS) spectroscopy of gas‐phase CO2 via phase and polarization shaping of a broadband continuum

Laser diagnostics and minor species detection in combustion using resonant four-wave mixing

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Single‐beam coherent anti‐Stokes Raman scattering (CARS) spectroscopy of gas‐phase CO₂ via phase and polarization shaping of a broadband continuum