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Angle-Resolved Midinfrared Detection Based on Noncollinear Configuration
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DOI：10.1021/acsphotonics.5c01683.png)
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Abstract
En 中文
Accurate localization of midinfrared (MIR) radiation is essential for high-precision spatial analysis, underpinning a wide range of applications, including aerial surveillance, environmental monitoring, and free-space optical communication. Here, we propose and demonstrate an angle-resolved up-conversion detection mechanism, which maps the MIR angular information into the visible domain based on noncollinear phase matching. Under the constraint of phase-matching condition, the spatial angles of the blue-violet signal (420 nm) and MIR target (5233 nm) beams exhibit the approximately linear correlation with the angular scaling factor of λ420/λ5233 ≈ 0.08. Consequently, the angle-resolved detection technology enables directional tracking of the target beam in the measurement range of ±18′ with the absolute error of less than 0.76′ and shows the measurement stability of less than 0.12′ over a duration of about 4.5 h for the spatial angle of 6′. This high-precision indirect detection approach is extremely promising for calibrating and optimizing spatial analysis and enables generalized spatial sensing schemes across the various spectral windows.