Photo-acoustic dual-frequency comb spectroscopy

Abstract

Photo-acoustic spectroscopy (PAS) is one of the most sensitive non-destructive analysis techniques for gases, fluids and solids. It can operate background-free at any wavelength and is applicable to microscopic and even non-transparent samples. Extension of PAS to broadband wavelength coverage is a powerful tool, though challenging to implement without sacrifice of wavelength resolution and acquisition speed. Here, we show that the unmatched precision, speed and wavelength coverage of dual-frequency comb spectroscopy (DCS) can be combined with the advantages of photo-acoustic detection. Acoustic wave interferograms are generated in the sample by dual-comb absorption and detected by a microphone. As an example, weak gas absorption features are precisely and rapidly sampled; long-term coherent averaging further increases the sensitivity. This novel approach of photo-acoustic dual-frequency comb spectroscopy generates unprecedented opportunities for rapid and sensitive multi-species molecular analysis across all wavelengths of light.

References in corpus (5)

• Frequency comb spectroscopy
• Microresonator Soliton Dual-Comb Spectroscopy
• Coherent, multi-heterodyne spectroscopy using stabilized optical frequency combs
• High-resolution and gapless dual comb spectroscopy with current-tuned quantum cascade lasers
• Broadband photoacoustic spectroscopy of ${}^{14}{\text{CH}}_4$ with a high-power mid-infrared optical frequency comb

Cited by in corpus (7)

• Near-ultraviolet photon-counting dual-comb spectroscopy
• Dual-comb cavity ring-down spectroscopy
• 1 GHz dual-comb spectrometer for fast and broadband measurements
• Observation of flat-band and band transition in the synthetic space
• Time-resolved dual-comb spectroscopy with a single electro-optic modulator
• Sensitive multi-species photoacoustic gas detection based on mid-infrared supercontinuum source and miniature multipass cell
• Real-Time Electro-Optic Dual Comb Detection of Ultrasound Waves