Abstract
We calculate the reflected second harmonic light from alkali metal films with the simultaneous excitation of the surface plasmon mode. The harmonic generation from a sodium film at the ruby laser frequency increases by over two orders of magnitude at the angle for surface plasmon excitation. The harmonic enhancement is closely related to the surface plasmon density and exhibits a strong dependence on the angle of incidence, film thickness, and the linear optical constants of the metal film.
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