Lin E, Scherman M, Santagata R, Bresson A, Attal-Tretout B. Birefringence based multi-focus fs/ps-CARS spectroscopy for thermometry and hyperspectral microscopy.
OPTICS EXPRESS 2023;
31:11899-11912. [PMID:
37155814 DOI:
10.1364/oe.485446]
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Abstract
We present a multi-focus fs/ps-CARS scheme to perform spectroscopy on multiple points simultaneously for gas phase measurements and microscopy, using a single birefringence crystal or a combination of birefringent stacks. CARS performances are first reported for 1 kHz single-shot N2 spectroscopy on two points set few millimeters apart, allowing thermometry measurements to be carried out in the vicinity of a flame. Then, simultaneous acquisition of toluene spectra is demonstrated on two points set 14 µm apart in a microscope setup. Finally, two-point and four-point hyperspectral imaging of PMMA microbeads in water is performed, demonstrating a proportional increase in acquisition speed.
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