Ultra-rapid broadband mid-infrared spectral tuning and sensing
Xiaoshuai Ma, Tianjian Lv, Xudong Zhu, Ming Yan, Heping Zeng

TL;DR
This paper introduces a high-speed broadband mid-infrared spectral tuning method using spectral focusing and electro-optic combs, enabling rapid, wide-range sensing suitable for real-time molecular analysis.
Contribution
The authors develop a novel spectral focusing technique with electro-optic combs for ultra-rapid broadband mid-IR spectral tuning and sensing, surpassing existing limitations.
Findings
Achieved spectral tuning at 5.6 THz/us with 380 elements.
Demonstrated broad spectral coverage from 2600 to 3780 cm-1.
Enabled rapid spectral acquisition at 6.3 microseconds per scan.
Abstract
Tunable mid-infrared lasers are essential for optical sensing and imaging. Existing technologies, however, face challenges in simultaneously achieving broadband spectral tunability and ultra-rapid scan rates, limiting their utility in dynamic scenarios such as real-time characterization of multiple molecular absorption bands. Here, we present a high-speed approach for broadband wavelength sweeping in the mid-infrared region, leveraging spectral focusing via difference frequency generation between a chirped fiber laser and an asynchronous, frequency-modulated electro-optic comb. This method enables pulse-to-pulse spectral tuning at a speed of 5.6 THz/us with 380 elements. Applied to spectroscopic sensing, our technique achieves broad spectral coverage (2600-3780 cm-1) with moderate spectral resolution (8 cm-1) and rapid acquisition times (6.3 us). Notably, the controllable electro-optic…
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Taxonomy
TopicsSpectroscopy and Laser Applications · Advanced Fiber Optic Sensors · Photonic and Optical Devices
