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We analyze the pump wavelength dependence for the photo-induced enhancementof interlayer coupling in La1.885Ba0.115CuO4, which is promoted by opticalmelting of the stripe order. In the equilibrium superconducting state (T < Tc =13 K), in which stripes and superconductivity coexist, time-domain THzspectroscopy reveals a photo-induced blue-shift of the Josephson PlasmaResonance after excitation with optical pulses polarized perpendicular to theCuO2 planes. In the striped, non-superconducting state (Tc < T < T_SO = 40 K) atransient plasma resonance similar to that seen below Tc appears from afeatureless equilibrium reflectivity. Most strikingly, both these effectsbecome stronger upon tuning of the pump wavelength from the mid-infrared to thevisible, underscoring an unconventional competition between stripe order andsuperconductivity, which occurs on energy scales far above the orderingtemperature.

Wavelength dependent optical enhancement of superconducting interlayer coupling in La1.885Ba0.115CuO4