Time-stretch infrared spectroscopy

Abstract

Improving spectral acquisition rate of broadband mid-infrared spectroscopy promises further advancements of molecular science and technology. Unlike the pump-probe spectroscopy that requires repeated measurements with different pump-probe delays, continuous spectroscopy running at a high spectral acquisition rate enables transient measurements of rapidly changing non-repeating phenomena or statistical analysis of a large amount of spectral data acquired within a short time. Recently, Fourier-transform infrared spectrometers (FT-IR) with rapid delay scan mechanisms including dual-comb spectrometers have significantly improved the measurement rate up to ~1 MSpectra/s that is fundamentally limited by the signal-to-noise ratio. Here, we overcome the limit and demonstrate the fastest continuous broadband vibrational spectrometer running at 80 MSpectra/s by implementing wavelength-swept time-stretch spectroscopy technique in the mid-infrared region. Our proof-of-concept experiment of the time-stretch infrared spectroscopy (TS-IR) demonstrates broadband absorption spectroscopy of phenylacetylene from 4.4 to 4.9 μm (2040-2270 cm-1) at a resolution of 15 nm (7.7 cm-1) with a superior signal-to-noise ratio of 85 without averaging and a shot-to-shot fluctuation of 1.3%.

References in corpus (5)

• Frequency comb spectroscopy
• Direct Frequency Comb Measurement of OD + CO -> DOCO Kinetics
• Fully phase-stabilized quantum cascade laser frequency comb
• Time-Encoded Raman: Fiber-based, hyperspectral, broadband stimulated Raman microscopy
• Real-time spectral analysis of ultrafast pulses using a free-space angular chirp enhanced delay

Cited by in corpus (8)

• Upconversion time-stretch infrared spectroscopy
• A simple approach of broadband mid-infrared pulse generation with a mode-locked Yb-doped fiber laser
• Mid-infrared optical coherence tomography with MHz axial line rate for real-time non-destructive testing
• Single-photon time-stretch infrared spectroscopy
• Cavity-Enhanced Vernier Spectroscopy with a Chip-Scale Mid-Infrared Frequency Comb
• Broadband coherent Raman scattering spectroscopy at 50,000,000 spectra/s
• Fiber-based mid-infrared frequency-swept laser at 50 MScans/s via frequency down-conversion of time-stretched pulses
• Free-electron laser-based extended wide-field mid-infrared photothermal imaging for biomedical and microplastic analysis