We experimentally investigate odd-order harmonic generation in molecular gases produced by circularly polarized laser fields. While forbidden in isotropic medium, this effect is allowed by symmetry breaking resulting from nonadiabatic laser-induced molecular alignment. The demonstration is provided by generating the third harmonic in CO₂ molecules. Attractive properties and challenging potential applications are discussed in the context of higher-order harmonic generation.
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Houzet et al. (2013) studied this question.
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