Metrology-grade mid-infrared spectroscopy for multi-dimensional perception
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arXiv
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| Autori principali: | , , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866908802125660160 |
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| author | Shi, Baoqi Zhang, Chenxi Zheng, Ming-Yang Hu, Yue Zhong, Zeying Shang, Zhenyuan Ma, Wenbo Xie, Xiu-Ping Bai, Xue Luo, Yi-Han Wang, Anting Guo, Hairun Zhang, Qiang Liu, Junqiu |
| author_facet | Shi, Baoqi Zhang, Chenxi Zheng, Ming-Yang Hu, Yue Zhong, Zeying Shang, Zhenyuan Ma, Wenbo Xie, Xiu-Ping Bai, Xue Luo, Yi-Han Wang, Anting Guo, Hairun Zhang, Qiang Liu, Junqiu |
| contents | The mid-infrared spectral window is essential for molecular fingerprinting and atmospheric sensing, yet unlocking its full potential is currently constrained by a fundamental instrumental trade-off: existing systems cannot simultaneously deliver broad bandwidth, high photon flux, and metrological frequency fidelity. Here, we resolve this bottleneck by demonstrating a metrology-grade spectroscopic system based on difference frequency generation, driven by widely tunable, near-infrared diode lasers traceable to atomic standards. Our system achieves continuous tunability across the 3-3.7 $μ$m atmospheric window and delivers output power exceeding 45 mW with an absolute frequency accuracy of 7.2 MHz. We harness this convergence to overcome a critical barrier in integrated photonics, unambiguously identifying and eliminating hydrogen-induced absorption in silicon nitride microresonators to achieve an 88-fold reduction in optical loss. We further reveal multi-phonon absorption in the silica cladding as the fundamental limit to mid-infrared integrated photonics. Finally, we demonstrate the system's versatility through scattering-resilient LiDAR capable of penetrating optically dense fog, and dual-modality sensing that simultaneously retrieves target distance and chemical composition. By unifying the rigor of frequency metrology with the versatility of broadband sensing, this architecture establishes a new paradigm for multi-dimensional perception in complex environments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_00958 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Metrology-grade mid-infrared spectroscopy for multi-dimensional perception Shi, Baoqi Zhang, Chenxi Zheng, Ming-Yang Hu, Yue Zhong, Zeying Shang, Zhenyuan Ma, Wenbo Xie, Xiu-Ping Bai, Xue Luo, Yi-Han Wang, Anting Guo, Hairun Zhang, Qiang Liu, Junqiu Optics The mid-infrared spectral window is essential for molecular fingerprinting and atmospheric sensing, yet unlocking its full potential is currently constrained by a fundamental instrumental trade-off: existing systems cannot simultaneously deliver broad bandwidth, high photon flux, and metrological frequency fidelity. Here, we resolve this bottleneck by demonstrating a metrology-grade spectroscopic system based on difference frequency generation, driven by widely tunable, near-infrared diode lasers traceable to atomic standards. Our system achieves continuous tunability across the 3-3.7 $μ$m atmospheric window and delivers output power exceeding 45 mW with an absolute frequency accuracy of 7.2 MHz. We harness this convergence to overcome a critical barrier in integrated photonics, unambiguously identifying and eliminating hydrogen-induced absorption in silicon nitride microresonators to achieve an 88-fold reduction in optical loss. We further reveal multi-phonon absorption in the silica cladding as the fundamental limit to mid-infrared integrated photonics. Finally, we demonstrate the system's versatility through scattering-resilient LiDAR capable of penetrating optically dense fog, and dual-modality sensing that simultaneously retrieves target distance and chemical composition. By unifying the rigor of frequency metrology with the versatility of broadband sensing, this architecture establishes a new paradigm for multi-dimensional perception in complex environments. |
| title | Metrology-grade mid-infrared spectroscopy for multi-dimensional perception |
| topic | Optics |
| url | https://arxiv.org/abs/2602.00958 |