High-speed Fourier-transform spectroscopy by non-mechanical cavity modulation

Kotaro Hiramatsu

doi:10.1117/12.2610018

5 March 2022 High-speed Fourier-transform spectroscopy by non-mechanical cavity modulation

Kotaro Hiramatsu

Proceedings Volume PC12005, Smart Photonic and Optoelectronic Integrated Circuits 2022; PC1200502 (2022) https://doi.org/10.1117/12.2610018
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

Dual-comb spectroscopy, in which two synchronized mode-locked lasers are used as light sources of Fourier-transform spectroscopy, attracts much attention by its high spectral resolution and broad spectral bandwidth. However, there exists a trade-off between the spectral acquisition rate and the signal-to-noise ratio or the spectral bandwidth. Here, we overcome this trade-off by employing a mode-locked laser, whose repetition rate is rapidly modulated, together with a fixed-repetition-rate mode-locked laser. Specifically, we performed characterization of molecular vibrations through time-domain coherent Raman spectroscopy. In this demonstration, a high-spectral acquisition rate of 100,000 spectra/s was achieved with a broad bandwidth of 200 – 1400 cm-1.

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Citation Download Citation

Kotaro Hiramatsu "High-speed Fourier-transform spectroscopy by non-mechanical cavity modulation", Proc. SPIE PC12005, Smart Photonic and Optoelectronic Integrated Circuits 2022, PC1200502 (5 March 2022); https://doi.org/10.1117/12.2610018

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KEYWORDS

Spectroscopy

Modulation

Mode locking

Raman spectroscopy

Signal to noise ratio

Molecular spectroscopy

Optical spectroscopy

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