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(Color online) (a) Representative optical ray plots for excitation light and nonlinear optical signals when using the GRIN lens and the aspherical compound lens. (b) Chromatic longitudinal focal shift from the DCF tip for the nonlinear optical signals with 810 nm excitation when using the GRIN lens and aspherical compound lens. (c) Calculated collection efficiency of TPF/SHG signals when using the GRIN lens, the compound lens, and the compound lens plus the MMF collector.
