Failures of the four-wave mixing model for cone emission

Abstract Strontium vapor is pumped by an unfocused, single-mode, pulsed dye laser tuned near the 461 nm resonance transition. With blue laser detuning the previously reported red-shifted conical emission is present. We simultaneously resolve in angle and in frequency the emissions from this intense, near-resonant pumping of a “two-level” atom. This quantitative spectral and angular discrimination provides uniquely detailed measurements and demonstrates a serious lack of understansding of this highly nonlinear phenomenon.

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