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Q-switched and phase-locked Yb-doped multicore fiber laser is reported. The monolithic in-phase mode selection at the output fiber end realizes clean single-lobe beam profile and high slope efficiency of 62% with 280μJ, 100ns pulses.
We engineer resonance energy transfer into hybrid organic/inorganic and colloidal/epitaxial semiconductor nanostructures and utilize it as an efficient mechanism to couple these heterogeneous material systems leading to improved efficiencies both in photovoltaic solar and light emitting diode devices.
We demonstrate the efficient manipulation of plasmonic Airy beams in linear optical potentials produced by a wedged metal-dielectric-metal structure. By varying the angle between the metallic plates, we can accelerate, compensate or reverse the self-deflection of the plasmonic Airy beams without compromising the self-healing properties. We also show that in the linear potentials the Airy plasmons...
Focusing THz waves into a sub-wavelength area is a crucial issue for THz spectroscopy of minute samples and also for high-spatial resolution THz-imaging. Recently, super-focusing phenomena of THz waves, or more generally, those of electromagnetic waves are under intense investigation with theoretical and experimental studies using tapered metallic waveguiding structures. In this report we present...
Si-based ARROW PCWs were first successfully fabricated. For the preliminary experiments, the losses about 5 dB/mm or even lower with a long length of 800-μm were achieved. Design, fabrication, and characterization of the devices will be presented.
Self-pumped phase conjugate mirror is successfully constructed using a broad-area laser diode with angled feedback configuration. We demonstrate the light output decrease and the half-axial mode specific to the phase conjugate resonator.
We report the efficient generation of a four-qubit bound entangled Smolin state. We also demonstrate the activation of the bound entanglement; we make the bound entanglement in the Smolin state distillable with the help of an additional Bell pair.
Strong self-pulsation is inherent in Tm:YAlO3 lasers, making them difficult to use. The suppression methods reported in literature use an intra-cavity AOM, which is not viable for high power operation. We demonstrate the first reported suppression of such self-pulsing in Tm:YAlO3 using a feedback loop with current directly injected into the diode.
A binary grating on a Spatial Light Modulator generates twin antiphase spots with adjustable positions across the core of a multimode fibre allowing adaptive excitation of antisymmetric mode-groups for improving modal dispersion or modal multiplexing.
We proposed a difference equation model for fiber lasers mode-locked with nonlinear polarization evolution. It can be used to characterize intra-cavity nonlinear dynamics, such as steady one-pulse, period multiplication, multi-pulsing and chaos. The influence of adjusting wave-plate is also studied. By shifting linear phase bias, overdriving of saturable absorber is solved, and pulses of higher energy...
The multi-wavelength back-propagation (MWB) method has been developed for measuring positions of multiple reflecting surfaces longer than the optical wavelength. In this study, we demonstrate one dimensional profile measurement of a glass film by a sinusoidal phase modulating (SPM) spectral interferometer with MWB method. Displacements of front and rare surfaces of the glass film vibrating with 9...
Single-photon performances characterization of InGaAs/InP avalanche photodiodes (APDs) using a dual-APDs balanced-capacitance self-differencing operation was proposed. Small spike-noise and low discrimination-level were simultaneously achieved. Reducing in dark-count rate was also presented in the proposed scheme.
We present Terahertz (THz) time domain spectroscopy measurement of low loss microstructured kagome fibers using specially designed THz lenses. Losses as low as 0.6 cm−1, 20 times lower than the fiber cladding material loss have been achieved. Single-mode propagation in the air core with very low dispersion is experimentally observed for these fibers. Comparison between two different core diameters...
We describe a quantum computing architecture that uses satellite lines in rare earth doped EuCl3.6H2O as qubits. The crystallographic sites to which these lines belong are identified and this information is used to predict the performance of the quantum computing system.
An ultra-broadband high-efficiency grating coupler has been designed for the +1 diffraction order at an operating wavelength of 1.55μm for TM polarization in horizontal slot waveguide. The coupling bandwidth is significantly increased by properly raising the height of unperturbed silicon ridges, meanwhile the coupling efficiency is also enhanced. The 1dB bandwidth is 70nm which doubles the previously...
We present the generation of quantum correlated twin beams in a whispering gallery mode resonator made from lithium niobate and the first direct observation of amplitude squeezing for the single parametric beams.
We develop nonlinear optical spectroscopy for nanoscale chemical identification based on femtosecond light sources. The idea is based on our previously developed tip-enhanced spectroscopy. Combining the femtosecond light sources with a metallic tip generates a highly localized and intense electric field at the tip end that can be used as a nanoscale light source for variety of spectroscopy. However,...
We report a high power picosecond pulses all fiber, one-stage MOPA system. A passively mode-locked ytterbium-doped fiber laser was used as seed source. Average output power as high as 102W was obtained in 76 ps pulses at 18.6 MHz repetition rate at 1064 nm with bandwidth of 0. 5 nm.
Gain modulation was applied to semiconductor saturable absorber mirror based picosecond Nd:GdVO4 lasers for achieving stable Q-switched mode locking and enhancing its peak power to 8 times higher than that operated at continuous-wave mode locking.
The use of carbon nanotubes (CNTs) represents a typical approach to reduce both cost and size and to improve the efficiency of photovoltaic (PV) devices. In order to concentrate the incident power in what is known as hot spots, an array spatial arrangement has been formed as a square mesh fractal topology. The interaction between electromagnetic waves from the sun and CNTs is simulated in order to...
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