Carrier-frequency dependence of a step-modulated pulse propagating through a weakly dispersive single narrow-resonance absorber

Our article on optical precursors is out now, visit the abstract at:

Carrier-frequency dependence of a step-modulated pulse propagating through a weakly dispersive single narrow-resonance absorber

Near a narrow resonance, an optical pulse can pass through a strongly-absorbing atomic vapor for the first few nanoseconds. The part of the pulse that makes it through the material is called a precursor. Our paper explores the form of the precursors as the carrier frequency is tuned off resonance.

Optical precursors

Experimentally obtained transient transmission intensity (black solid lines) compared with two theoretical analysis: the asymptotic analysis (red dotted lines), and the weakly dispersive narrow resonance (blue dashed lines). Transient transmission taken near the 4S1/2 (F = 1) ↔ 4P1/2 (F = 2) transition for (a) ∆ = ∆(1) ∼ 5δ, (b) ∆ = ∆(2) ∼ δ, and (c) ∆ = ∆(3) ∼ 0.

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