Ultra-rapid broadband mid-infrared spectral tuning and sensing
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866929679822225408 |
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| author | Ma, Xiaoshuai Lv, Tianjian Zhu, Xudong Yan, Ming Zeng, Heping |
| author_facet | Ma, Xiaoshuai Lv, Tianjian Zhu, Xudong Yan, Ming Zeng, Heping |
| contents | 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 comb facilitates high scan rates of up to 2 Mscans/s across the full spectral range (corresponding to a speed of 60 THz/us), with trade-offs in number of elements (~30) and spectral point spacing or resolution (33 cm-1). Nevertheless, these capabilities make our platform highly promising for applications such as flow cytometry, chemical reaction monitoring, and mid-IR ranging and imaging. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_09945 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ultra-rapid broadband mid-infrared spectral tuning and sensing Ma, Xiaoshuai Lv, Tianjian Zhu, Xudong Yan, Ming Zeng, Heping Optics Applied Physics 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 comb facilitates high scan rates of up to 2 Mscans/s across the full spectral range (corresponding to a speed of 60 THz/us), with trade-offs in number of elements (~30) and spectral point spacing or resolution (33 cm-1). Nevertheless, these capabilities make our platform highly promising for applications such as flow cytometry, chemical reaction monitoring, and mid-IR ranging and imaging. |
| title | Ultra-rapid broadband mid-infrared spectral tuning and sensing |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2501.09945 |