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Using the measured density matrix of a four photon GHZ state, created in our unique inductive setup, we calculated the density matrices of possible states with higher photon numbers and their entanglement and non-locality violation.
We present the latest results in extending dual-comb spectroscopy to two-photon resonances. By measuring two-photon excitation of rubidium vapor and water-dissolved fluorophores, we demonstrate both the high resolution and speed of the technique.
We present modulators developed in the projects “HELIOS”, and “UK Silicon Photonics”, integration with modulator driver to produce the first silicon modulator fully integrated with BiCMOS, and multiplexed photonic crystal modulators for ultra-low power operation.
We have designed, fabricated, and characterized novel p-n junction photodetectors based on macroscopic single-wall carbon nanotube films. A broadband responsivity up to ∼ 1 V/W was observed at the junction region. By controlling for substrate and doping levels, we determined that the mechanism is the photothermoelectric effect, which is supported by a theoretical model.
We demonstrate a quantum receiver that discriminates four nonorthogonal states with error probabilities below the standard quantum limit (SQL) for a wide range of input powers and as much as 6 dB below the SQL.
With the aim of using plasmonics in an integrated-circuit scheme where single quantum emitters can be probed efficiently, we comprehensively study the scattering properties of single gold Yagi-Uda antennas placed on one-dimensional silicon nitride waveguides.
We experimentally demonstrate coherent spectral phase encoded optical code-division multiple access that fully suppresses multiple access interference and speckle noise for the first time without the need for fast nonlinear time gating.
Coherently injection-locked and directly modulated WRC-FPLD for optical 16-QAM/122-subcarrier OFDM transmission at 1.5625GHz central carrier over 25km is demonstrated to achieve 12.5Gbit/s bit-rate with receiving sensitivity of −7dBm at BER of 1 × 10−7.
Tunable temperature-independent triple-idler broadcasting of a signal into selective WDM channels to cover whole C and L bands is demonstrated utilizing cascaded second-order interactions in a 20-mm-long step-chirped PPLN with an engineered ∼28-nm-wide type-0 second-harmonic bandwidth.
We investigate coherent matched detection with paired fiber configuration, which improves phase matching between received time-frequency domain multiplexed signals and multicarrier local oscillator, giving a tolerance to residual dispersion.
Examples of synthetic aperture ladar (SAL) imaging utilizing an ultra-broadband actively stabilized chirp source are presented. Demonstrations include high definition strip-map, spotlight, and bistatic mode SAL imaging and interferometric SAL for 3D surface relief imaging.
Theory of thermally induced polarization and phase beam distortions in laser ceramics was improved and extended to the case of class 23 and m3 cubic crystals.
Reduction of absorption coefficient due to heat-up in hot-band pumped Nd:YAG was studied, and it was much smaller than cold-band pumping. In addition, the necessity of correction in the traditional model for line-bandwidth became clear.
Bit-by-bit wavelength switching for 10 Gbps signal based on a cross phase modulation in a fiber was successfully demonstrated by using 10-ps-wide saw-tooth control pulse generated from an optical pulse synthesizer.
Thermally induced distortions in Nd:glass rods 4.5cm in diameter have been measured and compensated by phase conjugate mirror and linear optics technique. Thermal loads in the rods are by factor 5 below thermal fraction limit.
We report on orthogonally polarized dual-wavelength operation of a continuous-wave Yb:KGW laser. Gain equalization of the two wavelengths with the Nm- and Np-polarizations was attributed to the effect of anisotropic thermal lensing.
A modified differential double pulse Brillouin sensing technique is demonstrated where both the wide and somewhat narrower pulses are launched simultaneously, rather than sequentially, using different frequency carriers.
In this work, emission cross-section dependence on temperature was observed experimentally in passively Q-switched Nd:YVO4/Cr4+:YAG laser. Heating the gain element from 30 °C to 70 °C, the Q-switch pulse energy at 100 Hz QCW pump was increased by three times from 60 μJ to 190 μJ and pulse duration was reduced by 30% from 2.5 ns to 1.8 ns, with peak power from 24 kW to 105 kW. With addition of heat...
The high repetition rate laser systems providing the ELI-ALPS facility with TW-to-PW peak intensity pulses are designed to generate secondary light sources with a duration of tens of attosecond for basic and applied researches.
Micro-ridge long-period fiber grating (MRLPFG) inscribed on a photonic crystal fiber was proposed and experimentally demonstrated. Transmission characteristics of the PCF-based MRLPFG with variations in strain and temperature were measured.
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