Abstract
Doubly resonantly enhanced sum frequency generation from rhodamine 6G monolayers adsorbed on glass substates is compared with resonantly enhanced second harmonic generation using a collinear excitation geometry. Second harmonic and sum frequency generation with a non‐collinear excitation geometry is also reported where spatial filtering of the non‐collinear output is shown to increase the scattered light rejection by more than 4 orders of magnitude.
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