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Journals and Conferences
Manipulation of quantum interference requires that the system under control remains coherent, avoiding (or at least postponing) the phase randomization that can ensue from coupling to an uncontrolled environment. We show that closed-loop coherent control can be used to mitigate the rate of quantum dephasing in a gas-phase ensemble of potassium dimers (K2),… (More)
We demonstrate efficient all-optical modulation using Rb vapor confined to a hollow-core photonic bandgap fiber. The intensity of a signal field participating in the four-wave-mixing process is modulated using a weak switching field. We observe 3 dB of attenuation in the signal field with only 3600 photons of switching energy, corresponding to 23 photons… (More)
We demonstrate 25% all-optical modulation with <20 photons, i.e., a few attojoules of energy, using nondegenerate two-photon absorption in rubidium atoms confined to a hollow-core photonic band-gap fiber. An attenuation of up to 3 dB is induced on an optical field with a switching energy density of less than one photon per (λ(2)/2π). We show that the… (More)
We demonstrate extremely efficient four-wave mixing with gains greater than 100 at microwatt pump powers and signal-to-idler conversion of 50% in Rb vapor confined to a hollow-core photonic band-gap fiber. We present a theoretical model that demonstrates such efficiency is consistent with the dimensions of the fiber and the optical depths attained. This is,… (More)
We demonstrate the ability to generate extremely large rubidium densities in uncoated hollow-core photonic band-gap fibers using light-induced atomic desorption. Once the fiber is exposed to Rb vapor for 1-2 weeks, and this atomic source is removed, the fiber yields large desorbable densities for an extended period of time. We show that optical depths… (More)
We study and demonstrate a version of spectral phase interferometry for direct electric-field reconstruction (SPIDER) that uses self-referencing homodyne detection. This technique has a higher sensitivity than conventional SPIDER, is self-calibrating, and can be adjusted for a wider range of pulse parameters.
We demonstrate tightly confined interactions with Rb atoms on a chip of silicon nitride nanowires. Optical depths of 2 are observed, and absorption spectroscopy reveals strong effects of transit-time broadening and Van der Waals shifts.
We show 40% all-optical modulation with 1 nW total power via non-degenerate two-photon absorption in Rb vapor confined to a photonic bandgap fiber. This corresponds to 12 photons of switching energy.
We demonstrate an all-optical method for characterizing ultrafast pulses by differential tomography, using four-wave mixing. The technique is used to measure dispersion for various lengths of silica fiber.