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We observe entanglement of two remote atomic qubits, by generating entangled state of an atomic qubit and a single photon, transmitting the photon to an adjacent laboratory, and converting the photon into an atomic qubit.
We exploit both the high nonlinearity and holey structure of microstructured fibers to combine an ultra-broadband light source and a gas cell in a single microstructured fiber filled with acetylene.
We propose a tunable spectral bandpass filter using short- and long-wavelength bend-loss edges of both MSF and HOF. Various spectral functionalities of filter are obtained by carefully choosing optimal bend radii for serially concatenated fibers.
Cross-phase-modulation-induced pulse delay or advancement in an optical fiber is analyzed. It is shown that XPM and group-velocity mismatch can lead to controllable pulse delay or advancement with negligible frequency shift.
Pulses from an ultrafast oscillator are conditioned, amplified, and delivered in an all-optical-fiber architecture. Combined with an electro-optic receiver, the complete system delivers a 4-V electrical trigger with less than 400 fs additive jitter.
The optical properties of rare earth doped silver halide crystals were studied in the middle infrared spectral range. The results indicate that these materials are promising candidates for development of mid-IR fiber lasers and amplifiers.
We have generated squeezed vacuum in optical telecommunication band by a single-pass parametric amplification in periodically poled lithium niobate. The measured noise reduction was 3.1 dB below the shot-noise level.
In this paper we propose a new technique that enables optical single sideband generation for optical subcarrier multiplexing. A high sideband suppression ratio is achieved across the full RF spectral band.
We have developed a novel technique to remove measurement noise generated by pinhole diffraction in confocal microscopy. We compared the refractive index measurement results using our technique with those obtained using a traditional system.
A new type of hydrogen sensor with a side-polished fiber Bragg grating coated with thin palladium film was demonstrated with the Bragg wavelength shift of 0.12 nm in the case of 99% hydrogen concentrations.
We have experimentally demonstrated quantum key distribution with a heralded single photon source and a photon number resolving detector. Numerical calculations have shown the expansion of the distance.
A practically tunable multiwavelength Raman fiber laser based on few-mode fiber Bragg gratings with dynamic range of more than 15 nm is investigated. We achieved a high extinction ratio of more than 45 dB.
Results on the inscription of Type IIA Bragg gratings in B-germanosilicate fibres using 248 nm, 500 fs laser radiation are presented. The gratings recorded exhibit index changes Deltan ap 10-3, while they remain intact for temperatures up to 650degC.
We change the pitch of interferometrically written 1-dimensional periodic structures by adjusting the frequency shift between two interfering beams. This technique is applicable to fabrication of both planar and fiber Bragg gratings.
Enhancement and suppression of spontaneous emission in certain directions near the bandgap is observed for dye molecules in the centre of tapered photonic crystal fibres, as predicted by LDOS calculations, but not by the bandstructure.
A balanced optical-RF phase detector for the extraction of low-jitter RF-signals from optical pulse trains, which is robust against drifts and photodetector nonlinearities, is presented. Sub-10 fs in-loop relative timing jitter is demonstrated.
Two types of supermode noise, uncorrelated and correlated, are demonstrated for two different types of harmonically modelocked lasers. The correlated supermode noise is originated from the excitation of multiple correlated optical supermodes.
A cladding-pumped, high-power amplifier was built incorporating a star-shaped, Ybdoped filter fiber. Pulsed amplifier measurements demonstrate strong suppression of stimulated Raman scattering accomplished by a special index profile with an up-doped ring.
Independent, absolute measurements of the pump, signal and idler carrier-envelope phase slip frequencies in a Ti:sapphire-pumped femtosecond optical parametric oscillator are demonstrated by characterisation against a common super-continuum reference derived from a photonic crystal fibre.
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