Volume 18, Issue 1 2300630
Research Article

Broadband Up-Conversion Mid-Infrared Time-Stretch Spectroscopy

Zhaoyang Wen

Zhaoyang Wen

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200062 China

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Bo Peng

Bo Peng

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200062 China

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Ming Yan

Corresponding Author

Ming Yan

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200062 China

Chongqing Key Laboratory of Precision Optics, Chongqing Institute of East China Normal University, Chongqing, 401120 China

Chongqing Institute for Brain and Intelligence, Guangyang Bay Laboratory, Chongqing, 400064 China

E-mail: [email protected], [email protected]

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Tingting Zheng

Tingting Zheng

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200062 China

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Qi Wen

Qi Wen

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200062 China

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Tingting Liu

Tingting Liu

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200062 China

Chongqing Key Laboratory of Precision Optics, Chongqing Institute of East China Normal University, Chongqing, 401120 China

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Xinyi Ren

Xinyi Ren

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200062 China

Chongqing Key Laboratory of Precision Optics, Chongqing Institute of East China Normal University, Chongqing, 401120 China

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Kun Huang

Kun Huang

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200062 China

Chongqing Key Laboratory of Precision Optics, Chongqing Institute of East China Normal University, Chongqing, 401120 China

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Heping Zeng

Corresponding Author

Heping Zeng

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200062 China

Chongqing Key Laboratory of Precision Optics, Chongqing Institute of East China Normal University, Chongqing, 401120 China

Chongqing Institute for Brain and Intelligence, Guangyang Bay Laboratory, Chongqing, 400064 China

Jinan Institute of Quantum Technology, Jinan, Shandong, 250101 China

E-mail: [email protected], [email protected]

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First published: 24 August 2023
Citations: 3

Abstract

Time-stretch spectroscopy is a powerful tool for studying transient and nonrepetitive physical events. Its extension to the fundamental molecular fingerprint region is promising for chemical and biological research but encounters difficulties in mid-infrared photodetection and strong attenuation of aqueous environments. Here, mid-infrared time-stretch spectroscopy via coincidently-pumped nonlinear frequency conversion for efficient mid-infrared generation and detection is demonstrated. Broadband (≈200 cm−1) mid-infrared spectra at 77.5 Mspectra s−1 with high signal-to-noise ratio are recorded. The single-shot signal-to-noise ratio (SNR) measured within 2 ns exceeds 200. The method reveals fast spectral dynamics in a laser-induced liquid evaporation process with a temporal resolution of 12.9 ns. Furthermore, probing transient spectra during evaporation opens up a new opportunity for interrogating chemicals inside or behind a thick water layer. Integrating high speed, broad bandwidth, high SNR, and the potential for operating under an aqueous environment, this method will benefit many applications including molecular dynamics, chemical reactions, and biological diagnostics.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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