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Recent progress in the development of ultraviolet laser diodes will be reviewed. The effect of the heterostructure design on the gain characteristics as well as epitaxial growth challenges for AlGaN-based UV lasers will be discussed.
We describe a scheme for distributing time-bin entangled photons to multiple pairs of clients. With clients linked through the strong spectral correlations between the photons, a single down-conversion source can serve many clients simultaneously.
We demonstrate a 300 MHz quantum dot single photon source at 900 nm triggered by a telecommunications wavelength laser. The quantum dot is excited by on-chip-generated second harmonic radiation, resonantly enhanced by a photonic nanocavity.
We report the realization of an integrated beam splitter able to support polarization-encoded qubits. Using this device, we demonstrate quantum interference with polarization-entangled states and singlet state projection.
All-optical switching effect is realized based on dynamically tunable coupling of nanocomposite photonic crystal microcavities. The threshold pump photon energy as low as 600 fJ is achieved.
Second-harmonic generation (SHG) in planar Au/Co/Si nanostructures are studied. Current- and magneto-induced contributions to the SHG signal from cobalt interfaces are observed, and are shown to be comparable with the crystallographic SHG component.
We demonstrated the photon-number-resolving detection at 1.04 μm by coincidence frequency upconverison. The detection efficiency of 6.8% was obtained. The Poissionian distribution of the up-converted photons was observed directly.
The quantum treatment of optical coherence theory is generally carried out in the space-time domain. We present a quantum mechanical theory of first-order coherence for statistically non-stationary light in the space-frequency domain.
We describe a transceiver design for performing stealthy communication and target detection based on the continuous-variable nature of frequency entanglement that achieves improved detection sensitivity using weak signals in an environment of high background noise.
1.5 μm polarization entanglement generation is experimentally demonstrated based on birefringence in polarization maintained dispersion shifted fiber. Two-photon interference with visibility of >89% without subtracting background counts is achieved, indicating its polarization entanglement property.
We demonstrate coherent control of multiphoton absorption in a dynamically shifted energy level structure. In a three-level model system of atomic sodium, we controlled the quantum interference of sequential 2+1 photons and direct three-photon transitions.
We propose an all-optical method for molecular orientation by using intense visible and THz optical pulses. We show numerically that the highest degree of orientation <cos θ>∼0.6 in HBr is feasible under experimentally available conditions.
We examine the entanglement dynamics of two two-level systems (A & B) each interacting with separate harmonic oscillators (a & b) in a regime where rotating wave approximation is not valid.
Laser fabrication depth in diamond is limited by refractive index mismatch induced aberrations that can be corrected by using adaptive optics; we demonstrate a dual active element system that considerably extends practical fabrication depth.
We present updates on recent developments of a fully integrated, ultracompact fiberoptic scanning endomicroscope for nonlinear optical imaging. Approaches to significantly improve signal collection efficiency and resolution will be discussed.
Gold nanoshells (nanometer diameter silica core surrounded by thin gold shell) exhibit intrinsic, bright two-photon-induced photoluminescence (TPIP) that is ideal for biological imaging applications. We demonstrate 3D, microscopic imaging of nanoparticle distribution in solid tumors.
We report on a 42 MHz femtosecond two-color MgO:PPLN OPO pumped by a mode-locked 7.4 W Yb:KGW fs laser. Up to 1.5 W average output power and tunability from 1.45 to 1.88 μm have been achieved.
A Kramers-Kronig transform of multiphoton ionization rates allows for a computation of the spectrally dependent nonlinear refractive index change and predicts its intensity dependent saturation and inversion in remarkable agreement with recent experimental results.
Binary Fresnel lenses are fabricated by ablation of PMMA substrates with a femtosecond laser. The minimum feature size in our experimental conditions is 600 nm. Lenses with good transparency and focal lengths in the range from 500μm to 5mm are obtained, with a maximum efficiency close to the theoretical one.
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