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We measure the RMS roughness of crankshaft journals from 0.05–0.13microns at a 45degree angle of incidence and 70cm standoff distance. The system is used to detect and sort journals not polished to specifications.
Ridge waveguide type-I quantum-well GaSb-based diode lasers, with active regions utilizing InGaAsSb/AlInGaAsSb quantum wells, have been demonstrated to operate at temperatures as high as 40°C with 1 mW of power at wavelengths above 3.2 μm.
We demonstrate an increase of nearly 10 dB in the efficiency of broadband wavelength conversion via four-wave mixing in silicon nanowaveguides by incorporating a p-i-n structure and applying modest voltages to remove the free carriers.
We demonstrate that high numerical aperture coherent diffractive imaging enables three-dimensional imaging from a single exposure angle under certain conditions. We demonstrate this technique, called ankylography, with simulations and experiment from a tabletop soft-x-ray laser.
We show theoretically that the hybridization of radiative and guided modes at a metal/dielectric interface, where the dielectric is a homogeneous but anisotropic medium, can lead to the existence of quasi-guided surface plasmon polaritons (SPPs).
A combined computational and experimental study optimizing plasmon-enhanced absorption in Si thin film solar cells presented. A model system consisting of a 2-dimensional periodic /aperiodic arrays of Ag nanostructures on a silica coated Si film supported by a silica substrate is used in the simulations. We develop basic design rules for the realization of broadband absorption enhancements for such...
We present the latest results on high-power extreme-ultraviolet (EUV) light sources for lithography. This includes operation of high-power pulsed CO2 lasers, high repetition-rate Sn droplet targets, and collection of EUV light using multilayer-coated optics.
We describe high-brightness, broad area midinfrared semiconductor lasers. The laser structures incorporated 14 type-II quantum wells imbedded in thick waveguide/absorber regions composed of InGaAsSb. The optically pumped devices achieved higher brightness operation as unstable facets. For a 4 mm UR operating at λ=4.7µm and at 35 x threshold the device was observed to be diffraction limited. In comparison...
Electron drag effect in silver film increases dramatically and changes its sign at the resonant condition of the excitation of surface plasmon polariton. Conversely, external voltage applied to the film can modulate its reflectance.
Influence of surfactant on shape and oxidation of copper nanoparticles synthesized by pulsed laser ablation in aqueous medium has been studied. The ablation of copper is done by using focused output of 1064 nm of pulsed Nd:YAG laser in 1mM concentration of CTAB and SDS. It is found that the nanostructures synthesized in CTAB have elongated shape having size range of 40 – 60 nm, while that of in SDS...
We experimentally demonstrate a 16-QAM transmitter using a monolithically-integrated quad Mach-Zehnder in-phase/quadrature (QMZ-IQ) modulator with binary driving electronics.
A novel technique for detecting optical absorption in gases is demonstrated. The technique called resonant optothermoacoustic detection (ROTADE) is based on energy transfer from the optical beam area to a mechanical oscillator via molecular diffusion.
We experimentally demonstrate that a 1D photonic crystal surface incorporating a nanorod-structured layer reveals a 588-fold enhancement in fluorescence intensity through the use of resonance-enhanced excitation of Cy5 and resonance-enhanced extraction of Cy5 emission.
We present a mid-infrared frequency comb generated via differency frequency mixing of a Yb femtosecond fiber laser. After passing through a methane gas sample, the MIR comb is upconverted and dispersed onto a CCD for detection.
We use the unprecedented LCLS peak power to study nonlinear x-ray multiphoton physics in molecules. We report on fundamental questions concerning the creation and decay of double-core-hole vacancies in N2 by short x-ray pulses.
A monolithically integrated dual wavelength semiconductor laser for optical heterodyning is presented. We present a novel laser design which employs surface etched DBR gratings in order to obtain lasing at very narrow line widths.
A nanoscale hole placed centrally in the core of a PCF breaks the degeneracy between radially and azimuthally polarized modes, causing a large splitting in phase velocity, group velocity and dispersion.
A low loss silicon microstructured optical fiber that is dual moded and exhibits large mode area guidance properties is presented. The fiber was fabricated using a high pressure chemical fluid deposition technique to deposit low loss amorphous silicon into the holes of a pure silica hollow core photonic bandgap fiber. The resulting fiber has a core diameter of 9 µm but a small core-cladding index...
A wafer-scale (∼4 inch) 100 nm nano-checkerboard structure was fabricated. The fabrication combines multiple nanoimprint lithography, 3-D patterning and self-aligned etching. Transmission/reflection resonance at ∼750 nm and Raman enhancement of ∼ 4.5×106 were achieved.
The capacity demands for future undersea cable networks will push the industry to WDM spectral efficiencies in excess of 1-B/s/Hz. This will require significant progress in optical fibers and signal processing.
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