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We demonstrate a technique to compress spectral information in dual-comb spectroscopy that relies on subsampling of the electrical interferogram. It enables us to reduce the data sample rate by arbitrary factors directly in the sampling process or in post-processing of existing data. A demonstration code is provided.
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Light Sci Appl
August 2025
CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China, 230026, Hefei, China.
Photon-counting dual-comb spectroscopy (DCS) opens new possibilities for deploying DCS in scenarios previously constrained by limited detection sensitivity. However, inevitable optical path fluctuations hinder its practical implementation. Here, we propose a method to ensure the long-term stability of photon-counting DCS, overcoming turbulent optical paths, achieving attowatt-level detection sensitivity and quick acquisition times.
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February 2025
Parametric frequency conversion involving phonons is an intriguing physical issue in cavity optomechanics. Here, this phenomenon is exploited to devise multiple frequency combs in a three-mode optomechanical system assisted by a degenerate parametric amplifier (DPA). In the optomechanical model, the configuration of optical-mechanical-mechanical coupled resonators provides a well-established environment containing photon-phonon and phonon-phonon interactions.
View Article and Find Full Text PDFWe introduce an agile light source bridging from the near ultraviolet to the visible spectral region by covering more than 240 THz through resonant dispersive wave (RDW) emission in a gas-filled hollow-core fiber waveguide. The light source allows tuning of a 20 nm (FWHM) spectrum from ∼340 nm to 465 nm (645 to ∼885 THz) with conversion efficiencies of (1.5 ± 0.
View Article and Find Full Text PDFIn this work, we investigate how low-power continuous-wave (CW) optical injection into suppressed longitudinal modes far from the free-running mode (q = 0) of a single-mode discrete-mode laser (DML) influences the optical frequency combs (OFCs) generated in the DML under gain-switching (GS). In the absence of optical injection, the gain-switched DML emits an OFC at q = 0. Optical injection on a distant suppressed mode (q ≠ 0) produces a second OFC at the injected mode and can also enhance the spectral quality of the q = 0 comb.
View Article and Find Full Text PDFAn approach is described for spectrally parallel hyperspectral mid-infrared imaging with spatial resolution dictated by fluorescence imaging. Quantum cascade laser (QCL)-based dual-comb mid-infrared spectroscopy enables the acquisition of infrared spectra at high speed (<1 millisecond) through the generation of optical beat patterns and radio-frequency detection. The high-speed nature of the spectral acquisition is shown to support spectral mapping in microscopy measurements.
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