Broadband interferometric subtraction of optical fields

Buberl, Theresa; Sulzer, Philipp; Leitenstorfer, Alfred; Krausz, Ferenc; Pupeza, Ioachim

doi:10.1364/oe.27.002432

Cited by 16 publications

(3 citation statements)

References 27 publications

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“…Such spectral features are crucial for the detailed characterization and analysis of bio-samples using chemometric approaches [1]. Therefore, the combination of a short maximum OPD instrument which makes optimal use of the photon budget, combined with alternative spectrum estimation techniques could be a more effective route towards rapid broadband TD-CARS of complex bio-samples, especially when combined with sensitivity enhancement techniques [18][19][20]. While the MP-Prony spectrum estimation approach is based on a physically-relatable model of the time-domain data, other more contemporary approaches such as compressive spectral sensing may further improve the spectrum estimation accuracy and computational performance [21].…”

Section: Resultsmentioning

confidence: 99%

Enhanced spectral resolution for broadband coherent anti-Stokes Raman spectroscopy

Sinjab¹,

Hashimoto²,

Zhao³

et al. 2020

Opt. Lett.

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The spectral resolution of broadband Fourier-transform coherent anti-Stokes Raman spectroscopy is limited by the maximum optical path length difference that can be scanned within a short time in an interferometer. However, alternatives to the Fourier-transform exist which can bypass this limitation with certain assumptions. We apply one such approach to broadband coherent Raman spectroscopy using interferometers with short delay line (low Fourier spectral resolution) and large delay line (high Fourier spectral resolution). With this method, we demonstrate broadband coherent Raman spectroscopy of closely spaced vibrational bands is possible using a short delay line interferometer, with superior spectral resolution to the longer delay line instrument. We discuss how this approach may be particularly useful for more complex Raman spectra, such as those measured from biological samples.

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Section: Resultsmentioning

confidence: 99%

Enhanced spectral resolution for broadband coherent anti-Stokes Raman spectroscopy

Sinjab¹,

Hashimoto²,

Zhao³

et al. 2020

Opt. Lett.

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show abstract

“…To avoid this, the current excitation power would need to be reduced by 1-2 orders of magnitude to be in the regime of low time-to-damage for microscopic resolution. Future work should therefore focus on enhancing the detection sensitivity to enable FT-CARS detection at such power levels, possibly using heterodyne enhancement from the probe pulse [41], optical subtraction of the pump pulse (background signal) [42], or possibly temporal stretching of the pump and probe pulse to enable lock-in detection [43]. The latter two approaches may also be beneficial in terms of enhancing the dynamic range of measurement, which is currently limited as the AC resonant-CARS signal of interest is measured on top of a large DC non-resonant component.…”

Section: Discussionmentioning

confidence: 99%

Multimodal laser-scanning nonlinear optical microscope with a rapid broadband Fourier-transform coherent Raman modality

et al. 2020

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Nonlinear optical microscopy allows rapid high-resolution microscopy with image contrast generated from intrinsic properties of the sample. Established modalities such as multiphoton excited fluorescence and second/third-harmonic generation can be combined with other nonlinear techniques, such as coherent Raman spectroscopy which typically allow chemical imaging of a single resonant vibrational mode of a sample. Here, we utilize a single ultrafast laser source to obtain broadband coherent Raman spectra on a microscope, together with other nonlinear microscopy approaches on the same instrument. We demonstrate that the coherent Raman modality allows broadband measurement (>1000 cm -1 ), with high spectral resolution (<5 cm -1 ), with a rapid spectral acquisition rate (3-12 kHz). This enables Raman hyperspectral imaging of > kilo-pixel images at >11 frames per second.

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“…Therefore, although significant progress has been made toward broadband and high-power (>100 mW) MIR frequency combs [13][14][15][16][17][18][19] , the MIR DCS does not yet take full advantage of such sources since typical MIR detectors saturate at ~1 mW. Recently, some works have been demonstrated to alleviate the background issue by linear interferometry 20,21 .…”

mentioning

confidence: 99%

Mid-infrared cross-comb spectroscopy

et al. 2023

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Dual-comb spectroscopy has been proven beneficial in molecular characterization but remains challenging in the mid-infrared region due to difficulties in sources and efficient photodetection. Here we introduce cross-comb spectroscopy, in which a mid-infrared comb is upconverted via sum-frequency generation with a near-infrared comb of a shifted repetition rate and then interfered with a spectral extension of the near-infrared comb. We measure CO2 absorption around 4.25 µm with a 1-µm photodetector, exhibiting a 233-cm−1 instantaneous bandwidth, 28000 comb lines, a single-shot signal-to-noise ratio of 167 and a figure of merit of 2.4 × 106 Hz1/2. We show that cross-comb spectroscopy can have superior signal-to-noise ratio, sensitivity, dynamic range, and detection efficiency compared to other dual-comb-based methods and mitigate the limits of the excitation background and detector saturation. This approach offers an adaptable and powerful spectroscopic method outside the well-developed near-IR region and opens new avenues to high-performance frequency-comb-based sensing with wavelength flexibility.

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Broadband interferometric subtraction of optical fields

Cited by 16 publications

References 27 publications

Enhanced spectral resolution for broadband coherent anti-Stokes Raman spectroscopy

Enhanced spectral resolution for broadband coherent anti-Stokes Raman spectroscopy

Multimodal laser-scanning nonlinear optical microscope with a rapid broadband Fourier-transform coherent Raman modality

Mid-infrared cross-comb spectroscopy

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