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We study continuous-wave laser operation of a Cr:ZnSe:glass composite waveguide. Results show the influence of propagation losses on the power conversion efficiency, pumping range and the wavelength tunability of the laser.
Silicon nano-patterned membrane reflectors - Si-MR (2-dimensional photonic-crystal slabs) hold many promising applications in photonic integrated circuits and can be used as ultra-compact mirrors [1] with controlled spectral response [2]. Built entirely from dielectric materials, such membrane reflectors can have very low losses and therefore can deliver near-100% reflectivity both in narrow and wide-band...
Electron correlation is one of the main frontiers of modern science and of fundamental importance to such diverse fields as, e.g., many body systems, superconductivity and quantum computing. At the ultrafast laser frontier electron correlation has found prominence in the dramatic enhancement of multiple ionization [1] and high harmonic generation [2]. The underlying mechanism, called recollision [3],...
A new type InGaAsP/InGaAlAs quantum well is employed for high-speed, high-efficiency all-optical wavelength conversion. Less than 6.4ps all-optical impulse response with a successful 40Gb/s NRZ data transmission is demonstrated.
The effect of annealing on strain relaxation in porous GaN fabricated using electroless chemical etching is presented. The Raman shift of 1 cm−1 in phonon frequency of annealed porous GaN with respect to as-grown GaN corresponds to a relaxation of compressive strain by 0.41 ± 0.04 GPa. The strain relief promises a marked reduction in threading dislocation for subsequent epitaxial growth.
We demonstrate the generation of low divergence, spatially coherent, high-order harmonics (orders ranging from 23rd to 95th) using commercial sub-TW laser system. The 6 mJ, 32 fs laser pulses were loosely focused with f/125 concave mirror in a semi-infinite gas cell. The beam divergence was measured to be 0.18-mrad at the 59th harmonics (13.5 nm) in 18kPa of helium. The 59th harmonics with novel high-throughput,...
Welcome to San Francisco, California and the 25th IEEE Photonics Conference (previously known as the IEEE LEOS Annual Meeting). Following in the path of previous successful meetings, this year's conference features an extensive range of technical activities in addition to some unique events.
We used novel Monte-Carlo simulations with the Nonlinear Schrödinger Equation to analyze changes in timing-jitter after optical propagation within silicon nanowire-waveguides subjected to two-photon absorption; this absorption was found to attenuate the timing jitter.
Sub-picosecond, transform-limited pulses with parabolic optical intensity profile were generated for fiber based chirped pulse amplification (CPA) systems. By utilizing parabolic pulse shaping with both spectral intensity and phase modulation, pulse peak power was increased by a factor of 5 when using chirped fiber Bragg gratings (CFBG) stretcher, and by a factor of 6.2 with a fiber spool stretcher...
Data are presented demonstrating, to our knowledge, the first monolithic chip integrating a semiconductor laser with a spontaneous light emitting diode optical pump that can also act as a heat pump. The light emitting diode operates in the voltage bias regime needed to generate a thermoelectrophotonic heat absorption. Under ideal operation the light emitting diode can efficiently optically pump the...
A diode pumped CW Erbium (Er)-doped Zr-Ba-La-Al-Na (ZBLAN) fluoride glass fiber laser operating at 2.78 µm was demonstrated using a guided mode resonance filter (GMRF) as an external cavity mirror.
We discuss our recent results on 2D and 3D photonic crystal (PhC) nanocavity lasers. By utilizing high quality InAs quantum dots (QDs), we demonstrated various types of 2D PhC nanocavity lasers including a single dot laser. The micromanipulation technique boosts the quality factor of 3D PhC nanocavity, which facilitated the first demonstration of lasing oscillation in 3D PhC nanocavity. A silicon-based...
PMD is measured by the exact distortion it applies to a 10Gbaud DP-QPSK signal recorded by a coherent digitizer. Accuracies were obtained of 0.7ps (no noise loading) and 1.0ps (signal noise-loaded to 10dB Q-factor).
We report on a new fabrication approach to create individually-addressable InGaN-based nanoscale-LEDs. It is based on the creation by LEEBI of a spatially confined sub-micron-size charge injection path within the p-GaN of an LED structure.
In contrast to its electronic excellence, optical properties of crystalline Si are rather poor, making it less suitable for optoelectronic and photonic purposes. One promising solution to overcome this hurdle is by making use of nanostructured configurations, such as nanolayers or nanocrystals, where quantum confinement (QC)-induced effects increase the optical activity.
The previously demonstrated inherent temperature compensation of an interferometric fiber-optic current sensor is extended to the cases of large Faraday phase shifts and strong bend-induced birefringence in the sensing fiber.
We report on the fabrication of photopolymerizable polymer nanocomposites dispersed with semiconductor CdSe quantum dots as high as 0.91 vol.% (3.6 wt.%) and on their nonlinear optical responses measured by degenerate multi-wave mixing with a 532-nm picosecond laser. We show that multi-order self-diffracted beams are induced in a uniformly cured composite film, indicating that the composite film possesses...
We demonstrated efficient nonlinear coupling between local vibrating molecules and propagating polariton modes at the vibration frequency (namely, mid-IR frequencies) using suspended graphene waveguides. Each waveguide deposited a micron-scale periodic metal (plasmonic) structure. Nonlinear effect, at very modest pump laser intensities has been demonstrated; these intensity levels are often used in...
We propose to apply dicode encoding with electrical equalization in 40-Gb/s REAM-based WDM-PON. Rayleigh-backscattering tolerance and receiver sensitivity at BER of 2×10−4 are improved by 6 dB and 1.5 dB, respectively, compared with non-coded NRZ.
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