基于锥形相位调制的免校准宽带重建光谱仪

中文摘要 AI 辅助

重建光谱仪（RSs）将光谱分析从硬件密集型的色散方案转变为编码-解码方案。在基于散斑的RSs中，光谱被编码为无序的强度图案，然后通过算法恢复。然而，表征这种光谱编码传输矩阵（TMs）通常需要经验上复杂的校准，这依赖于昂贵的可调谐光源来生成已知波长。在本工作中，我们展示了一种完全免校准的RS，它利用了来自轴锥镜的锥形相位调制。目标光谱被编码为贝塞尔形式的强度轮廓，从而能够计算构建确定性TM，并因此完全消除了光学校准的需要。利用这种计算机生成的TM，我们在650 nm范围（1050-1700 nm）内实验实现了宽带光谱重建——几乎是现有校准简化RSs带宽的三倍——同时2.9 nm的光谱分辨率与这些同类产品相当。与需要光学校准以实现同等性能的RS相比，我们的方案实现了约36倍的成本降低。与大多数散斑RSs不同，轴锥镜RS不需要固定的输入偏振器，通过偏振不敏感操作进一步提高了能量效率和简单性。据我们所知，这是首次报道的实验性免校准RS，具有卓越的简单性、实用性和成本效益，适用于实际应用。

英文摘要

Reconstructive spectrometers (RSs) shift spectral analysis from hardware-heavy dispersion to encoding-decoding schemes. In the speckle-based RSs, spectra are encoded into disordered intensity patterns and then recovered algorithmically. However, characterizing such spectral-encoding transmission matrices (TMs) typically demands empirically complex calibrations, which rely on expensive tunable light sources to generate known wavelengths. In this work, we demonstrate a fully calibration-free RS that leverages conical phase modulation from an axicon. The target spectra are encoded into a Bessel-form intensity profile, enabling computational construction of a deterministic TM and thus completely removing the need for optical calibration. With this computer-generated TM, broadband spectral reconstruction is experimentally achieved across a 650 nm range (1050-1700 nm)--nearly three times the bandwidth of existing calibration-simplified RSs--while a spectral resolution of 2.9 nm remains comparable to that of these counterparts. Compared with an RS requiring optical calibration for equivalent performance, our solution achieves an approximate 36-fold cost reduction.Unlike most speckle RSs, the axicon RS requires no fixed input polarizer, further enhancing energy efficiency and simplicity through polarization-insensitive operation. To the best of our knowledge, this is the first reported experimentally calibration-free RS, featuring superior simplicity, practicality, and cost-effectiveness for practical applications.

发表机构

• College of Advanced Interdisciplinary Studies, National University of Defense Technology（国防科技大学前沿交叉学院）
• Nanhu Laser Laboratory, National University of Defense Technology（国防科技大学南湖激光实验室）
• Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology（国防科技大学湖南省高能激光技术重点实验室）

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