Gas-phase single-shot thermometry at 1 kHz using fs-CARS spectroscopy

Roy, Sukesh; Kulatilaka, Waruna D.; Richardson, Daniel; Lucht, Robert P.; Gord, James R.

doi:10.1364/ol.34.003857

Cited by 99 publications

(73 citation statements)

References 6 publications

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“…Instead of frequency-domain detection of the molecular distribution, the timedependent molecular response is resolved by temporally delaying the CARS probe from the initial Raman resonance induced by the pump and Stokes pulses [1,[20][21][22][23][24][25][26]. By utilizing the slope of the initial decay of the CARS signal due to frequency-spread dephasing, it is possible to extract gas-phase temperatures without interferences from collisional energy transfer [23][24][25][26]. Initial measurements utilized a slow-scan mechanical delay stage to probe the rovibrational Raman coherence at various time delays relative to the initial impulsive excitation [23,24].…”

Section: Introductionmentioning

confidence: 99%

“…Initial measurements utilized a slow-scan mechanical delay stage to probe the rovibrational Raman coherence at various time delays relative to the initial impulsive excitation [23,24]. Subsequent efforts employed a chirped probe pulse to instantaneously encode the time decay into the spectral domain for single-shot, time-domain thermometry using a spectrometer [25]. However, this approach is highly sensitive to the probe pulse shape and phase, which should be characterized in great detail for accurate measurements.…”

Section: Introductionmentioning

confidence: 99%

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Single-shot gas-phase thermometry using pure-rotational hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering

Miller¹,

Roy²,

Slipchenko³

et al. 2011

Opt. Express

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101

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High-repetition-rate, single-laser-shot measurements are important for the investigation of unsteady flows where temperature and species concentrations can vary significantly. Here, we demonstrate singleshot, purerotational, hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps RCARS) thermometry based on a kHz-rate fs laser source. Interferences that can affect nanosecond (ns) and ps CARS, such as nonresonant background and collisional dephasing, are eliminated by selecting an appropriate time delay between the 100-fs pump/Stokes pulses and the pulse-shaped 8.4-ps probe. A time-and frequencydomain theoretical model is introduced to account for rotational-level dependent collisional dephasing and indicates that the optimal probe-pulse time delay is 13.5 ps to 30 ps. This time delay allows for uncorrected best-fit N 2 -RCARS temperature measurements with ~1% accuracy. Hence, the hybrid fs/ps RCARS approach can be performed with kHz-rate laser sources while avoiding corrections that can be difficult to predict in unsteady flows. KeywordsFriedrich-Alexander University Erlangen-Nürnberg, aerodynamics, probes, Raman scattering, Raman spectroscopy, temperature measurement, thermometers, dephasing, femtoseconds, frequency domains, Fs laser, gasphase, high repetition rate, laser sources, species concentration, equipment design, optics and photonics, Fourier analysis Abstract: High-repetition-rate, single-laser-shot measurements are important for the investigation of unsteady flows where temperature and species concentrations can vary significantly. Here, we demonstrate singleshot, pure-rotational, hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps RCARS) thermometry based on a kHz-rate fs laser source. Interferences that can affect nanosecond (ns) and ps CARS, such as nonresonant background and collisional dephasing, are eliminated by selecting an appropriate time delay between the 100-fs pump/Stokes pulses and the pulse-shaped 8.4-ps probe. A time-and frequency-domain theoretical model is introduced to account for rotational-level dependent collisional dephasing and indicates that the optimal probe-pulse time delay is 13.5 ps to 30 ps. This time delay allows for uncorrected best-fit N 2 -RCARS temperature measurements with ~1% accuracy. Hence, the hybrid fs/ps RCARS approach can be performed with kHz-rate laser sources while avoiding corrections that can be difficult to predict in unsteady flows.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Single-shot gas-phase thermometry using pure-rotational hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering

Miller¹,

Roy²,

Slipchenko³

et al. 2011

Opt. Express

Self Cite

101

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show abstract

“…These lasers often operate at high repetition rate, i.e., kHz to MHz. [158][159][160][161][162] Hence, correlated data can be acquired and it has become possible to monitor turbulent flows and single, transient phenomena. 163 A big step into this direction was the recent development of burst mode lasers that produce a reasonable number of high energy laser pulses as a burst.…”

Section: Coherent Anti-stokes Raman Scatteringmentioning

confidence: 99%

Advanced Laser-Based Techniques for Gas-Phase Diagnostics in Combustion and Aerospace Engineering

Ehn

Zhu

et al. 2017

Appl Spectrosc

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Gaining information of species, temperature, and velocity distributions in turbulent combustion and high-speed reactive flows is challenging, particularly for conducting measurements without influencing the experimental object itself. The use of optical and spectroscopic techniques, and in particular laser-based diagnostics, has shown outstanding abilities for performing non-intrusive in situ diagnostics. The development of instrumentation, such as robust lasers with high pulse energy, ultra-short pulse duration, and high repetition rate along with digitized cameras exhibiting high sensitivity, large dynamic range, and frame rates on the order of MHz, has opened up for temporally and spatially resolved volumetric measurements of extreme dynamics and complexities. The aim of this article is to present selected important laser-based techniques for gas-phase diagnostics focusing on their applications in combustion and aerospace engineering. Applicable laser-based techniques for investigations of turbulent flows and combustion such as planar laser-induced fluorescence, Raman and Rayleigh scattering, coherent anti-Stokes Raman scattering, laser-induced grating scattering, particle image velocimetry, laser Doppler anemometry, and tomographic imaging are reviewed and described with some background physics. In addition, demands on instrumentation are further discussed to give insight in the possibilities that are offered by laser flow diagnostics.

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“…The development e¨ort is now dedicated to a hybrid femto-picosecond CARS setup to retrieve information such as temperature or chemical composition. The aim is to probe fast temporal dynamics in combustion with high repetition rate (kilohertz), as recently demonstrated by several authors [22,23].…”

Section: Coherent Anti-stokes Raman Spectroscopy With Femto/picoseconmentioning

confidence: 99%

“…A solution appeared recently, since ultrafast femtosecond lasers now permit to reach high enough peak powers to get strong enough single shot CARS signal at high repetition rate. Thus, kilohertz CARS thermometry was demonstrated at ¦rst by using the Chirped Probe Pulse technique [22], or later on using the hybrid pico-femtosecond regime [23]. The latter takes advantage of the two temporal regimes in order to provide:…”

Section: Hybrid Pico/femtosecond Coherent Anti-stokes Raman Spectroscmentioning

confidence: 99%

Recent progress of laser metrology in chemically reacting flows at onera

Mohamed

Dorval

Vilmart

et al. 2017

Progress in Flight Physics

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This paper presents some of the development actions performed these last years at ONERA using laser spectroscopic techniques to probe chemically reacting §ows. Techniques like laser absorption, laser induced §u-orescence (LIF), and Raman scattering will be described with focus on present drawbacks as well as expectations from new laser technologies (Interband Cascade Lasers (ICL) diodes, Optical Parametrical Oscillators (OPO), frequency comb, and femto/picosecond lasers) before showing some results of recent applications in ground facilities.

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Gas-phase single-shot thermometry at 1 kHz using fs-CARS spectroscopy

Cited by 99 publications

References 6 publications

Single-shot gas-phase thermometry using pure-rotational hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering

Single-shot gas-phase thermometry using pure-rotational hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering

Advanced Laser-Based Techniques for Gas-Phase Diagnostics in Combustion and Aerospace Engineering

Recent progress of laser metrology in chemically reacting flows at onera

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