Boniface Antoine, Mounaix Mickael, Blochet Baptiste, de Aguiar Hilton B, Quéré Fabien, Gigan Sylvain
Opt Express. 2021 Mar 15;29(6):8985-8996. doi: 10.1364/OE.403578.
Propagation of an ultrashort pulse of light through strongly scattering media generates an intricate spatio-spectral speckle that can be described by means of the multi-spectral transmission matrix (MSTM). In conjunction with a spatial light modulator, the MSTM enables the manipulation of the pulse leaving the medium; in particular focusing it at any desired spatial position and/or time. Here, we demonstrate how to engineer the point-spread-function of the focused beam both spatially and spectrally, from the measured MSTM. It consists of numerically filtering the spatial content at each wavelength of the matrix prior to focusing. We experimentally report on the versatility of the technique through several examples, in particular as an alternative to simultaneous spatial and temporal focusing, with potential applications in multiphoton microscopy.
超短光脉冲在强散射介质中的传播会产生复杂的时空光谱散斑，可通过多光谱传输矩阵（MSTM）来描述。结合空间光调制器，MSTM能够对离开介质的脉冲进行操控；特别是将其聚焦到任何所需的空间位置和/或时间。在此，我们展示了如何根据测量得到的MSTM在空间和光谱上设计聚焦光束的点扩散函数。这包括在聚焦之前对矩阵的每个波长处的空间内容进行数值滤波。我们通过几个例子实验性地报告了该技术的通用性，特别是作为同时进行空间和时间聚焦的替代方法，在多光子显微镜中有潜在应用。
