M. Holthaus et Dw. Hone, AC STARK EFFECTS AND HARMONIC-GENERATION IN PERIODIC POTENTIALS, Physical review. B, Condensed matter, 49(23), 1994, pp. 16605-16608
The ac Stark effect can shift initially nonresonant minibands in semic
onductor superlattices into multiphoton resonances. This effect can re
sult in strongly enhanced generation of a particular desired harmonic
of the driving laser frequency, at isolated values of the amplitude.