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Abstract
We introduce dual-pump coherent anti-Stokes-Raman scattering (dual-CARS) microscopy. This new technique permits simultaneous imaging of two species characterized by different molecular vibrations, as well as the removal of nonresonant background. This is achieved by using three synchronized laser pulses probing two different vibrations. We demonstrate the virtues of the method by imaging a mixture of nondeuterated and deuterated lipids, clearly distinguishing the individual components and their organization in the mixed arrangement. Further, dual-CARS images of lipid stores in living Caenorhabditis elegans nematodes show that the suppression of the nonresonant background results in significantly enhanced image contrast.
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