发表机构
Michigan State University（密歇根州立大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
提出一种基于频率扫描激光和频率选择器的布里渊光谱新方法，实现紧凑、散粒噪声限制下的测量，并有望通过多路复用实现快速力学成像。
AI 中文摘要
自发布里渊显微术提供了对材料粘弹特性的非接触式测量途径。标准测量通常使用单波长连续波激光照射样品，激发自发布里渊散射信号，随后由光谱仪记录。现有的布里渊光谱仪大多基于扫描法布里-珀罗标准具或虚拟成像相位阵列（VIPA）标准具构建。虽然性能良好，但这些装置体积庞大，且需要深厚的光学专业知识来搭建和维护。在此，我们提出一种进行布里渊光谱测量的新方法。在该方法中，频率扫描激光激发一系列中心频率逐步偏移的布里渊光谱，而一个由窄带滤光片和高灵敏度单光子探测器组成的频率选择器依次记录每个光谱分量，以重建完整光谱。我们证明，使用标准样品，频率扫描布里渊光谱可在散粒噪声限制条件下运行。与传统光谱仪相比，我们的系统具有更紧凑的设计，适用于便携式应用，并有望通过多路复用实现快速力学成像。
英文摘要
Spontaneous Brillouin microscopy provides non-contact access to the viscoelastic properties of materials. Standard measurements typically utilize a single-wavelength continuous-wave laser to illuminate a specimen and excites a spontaneous Brillouin scattering signal, which is then recorded by a spectrometer. Existing Brillouin spectrometers are mostly built around either a scanning Fabry-Pérot etalon or a virtually imaged phased array (VIPA) etalon. While performing well, these setups are bulky and demand significant optical expertise to construct and maintain. Here, we propose a new approach to conducting Brillouin spectroscopy. In this approach, a frequency-swept laser excites a series of Brillouin spectra with incrementally shifted central frequencies, while a frequency picker, consisting of a narrow bandpass filter and a highly sensitive single-photon detector, sequentially records each spectral component to reconstruct the full spectrum. We demonstrate that the frequency-swept Brillouin spectroscopy can run under shot-noise limited condition using standard samples. Compared with conventional spectrometers, our system features a much more compact design for portable applications and holds potential for rapid mechanical imaging through multiplexing.
Comments4 pages,4 figures
