Abstract
We demonstrate a robust, all-fiber, two-wavelength time-lens source for background-free coherent anti-Stokes Raman scattering (CARS) imaging. The time-lens source generates two picosecond pulse trains simultaneously: one at 1064 nm and the other tunable between 1040 nm and 1075 nm (~ 400 mW for each wavelength). When synchronized to a modelocked Ti:Sa laser, the two wavelengths are used to obtain on- and off-resonance CARS images. Real-time subtraction of the nonresonant background in the CARS image is achieved by the synchronization of the pixel clock and the time-lens source. Background-free CARS imaging of sebaceous glands in ex vivo mouse tissue is demonstrated.
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