Parallel confocal spectroscopy can significantly expand the analytical capacity of single biological cells and Raman hyperspectral imaging. Here, we report the development of a compressive sensing technique for single-acquisition multifocal Raman spectroscopy, which is capable of improving the speed of conventional confocal Raman spectroscopy by 2-3 orders of magnitude. The technique generates a 2-D multifocus excitation pattern and simultaneously record the Raman spectra from the multi-foci by projecting their scatterings along both the vertical and horizontal direction of the CCD camera, and both a pseudo-inverse and a hierarchical sparsity algorithms are developed to retrieve the individual spectra. The performance was validated by Raman spectroscopy of multiple trapped cells as well as by large-scale Raman imaging.
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