• Photonics Research
  • Vol. 11, Issue 2, 357 (2023)
Minjian Lu, Yujia Zhang, Xinyi Chen, Yan Li, and Haoyun Wei*
Author Affiliations
  • Department of Precision Instrument, State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China
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    DOI: 10.1364/PRJ.473841 Cite this Article Set citation alerts
    Minjian Lu, Yujia Zhang, Xinyi Chen, Yan Li, Haoyun Wei. Interpulse stimulation Fourier-transform coherent anti-Stokes Raman spectroscopy[J]. Photonics Research, 2023, 11(2): 357 Copy Citation Text show less

    Abstract

    Exploiting the time-resolving ability of ultrafast pulses, Fourier-transform coherent anti-Stokes Raman scattering (FT-CARS) stands out among the coherent Raman spectroscopic techniques for providing high-speed vibrational spectra with high spectral resolution, high Raman intensity, and immunity to nonresonant background. However, the impulsive stimulation nature of FT-CARS imposes heavy demands on the laser source and makes it inherently difficult to monitor high-frequency vibrations. Here, a novel FT-CARS strategy to our knowledge based on interpulse stimulation is proposed to provide more flexible measuring wavenumber region and lighten the requirement on ultrafast pulses. The mechanism of this technique is analyzed theoretically, and simulation is performed to show an orders-of-magnitude improvement of Raman intensity in the high-wavenumber region by the method. Experimentally, an ytterbium-doped fiber laser and photonic crystal fiber-based solitons are employed to provide two 100-fs pulses as the pump and Stokes, respectively, and to perform interpulse stimulation FT-CARS without sophisticated dispersion control devices. The high-wavenumber region and upper-part fingerprint region measurements are demonstrated as examples of flexible measurement. Combined with other rapid scanning techniques, such as resonant scanners or a dual-comb scheme, this interpulse stimulation FT-CARS promises to make the fascinating FT-CARS available for any desired wavenumber region, covering many more realistic scenarios for biomedical, pathological, and environmental research.
    Q(Ω)=χ(3)(Ω)0Ep(ω+Ω)ES*(ω)dω,(1)

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    EAS(ω)0ωEp(ωΩ)Q(Ω)dΩ,(2)

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    χ(3)(Ω)=χNR(3)(Ω)+χR(3)(Ω)=χNR(3)(Ω)+αΩΩ0iΓ,

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    eAS(t)=ep(t)q(t).

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    Idet=|eAS(t)|2dt=|ep(t)|2|q(t)|2dt.

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    Minjian Lu, Yujia Zhang, Xinyi Chen, Yan Li, Haoyun Wei. Interpulse stimulation Fourier-transform coherent anti-Stokes Raman spectroscopy[J]. Photonics Research, 2023, 11(2): 357
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