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Temporal focusing-based multiphoton excitation microscopy via digital micromirror device

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Abstract

This Letter presents an enhanced temporal focusing-based multiphoton excitation (MPE) microscope in which the conventional diffraction grating is replaced by a digital micromirror device (DMD). Experimental results from imaging a thin fluorescence film show that the 4.0 μm axial resolution of the microscope is comparable with that of a setup incorporating a 600lines/mm grating; hence, the optical sectioning ability of the proposed setup is demonstrated. Similar to a grating, the DMD diffracts illuminating light frequencies for temporal focusing; additionally, it generates arbitrary patterns. Since the DMD is placed on the image–conjugate plane of the objective lens’ focal plane, the MPE pattern can be projected on the focal plane precisely.

© 2014 Optical Society of America

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