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We report on the optical properties of a metal-organic photonic bandgap structure showing a peak transmission ~44% and that enhances the nonlinear optical properties of bulk Copper by up to an order of magnitude.
A fiber coupled high-finesse external cavity diode laser for cavity ringdown spectroscopy was successfully demonstrated. The sensitivity of 1 times 10-7 cm-1 was achieved in a 1 cm3 remotely located ringdown cavity as a sensor head.
Processing methods for optical-quality conjugated polymer charge-transfer composite films have been investigated. These materials exhibited strong energy-suppression characteristics in the near infrared regime for nanosecond pulses and show potential as efficient optical limiters for sensor protection.
A 977-nm Yb fiber laser is calculated to have high efficiency when operating in the LP07 high-order mode of a large core diameter (43 mum) fiber, with Yb doped in a ring inside the core.
Fiber lasers operating in the normal dispersion regime with a filter are analyzed with simulations of coupled-field equations. This model predicts new operating modes previously unrecognized by scalar simulations.
A simple fused silica light-guide assembly transmits 6 W concentrated solar power to a 2D-CPC cavity. The calculated laser power of 75.8 W is obtained for a 4 mm diameter Nd:YAG rod, reaching the conversion efficiency of 11W/m2.
A compact vacuum-free hard X-ray source based on high-field pulses from a femtosecond fiber laser interacting with nickel in gently flowing helium is demonstrated. Ka X-ray conversion efficiency is 1.7times10-9.
We have developed a microscale flexible image projection device, integrating a matrix addressable blue/green two-dimensional LED array to a multicore imaging fiber. Spatiotemporal patterns of illumination have been used to study amphibian visual system development.
Raman microspectroscopy is used for the first time to study chemical and structural transformations in RPE cells exposed to cw and short-pulsed high-intensity light irradiation.
We demonstrate an actively and harmonically mode-locked laser employing a 151-cm-long bismuth-oxide-based erbium-doped fiber and a 250-cm-long bismuth-oxide-based highly nonlinear fiber. Stable 10-GHz short pulses are obtained with a 60-nm tuning range covering the CL-band.
We propose a method for making low loss ring resonators in self processing photopolymers via direct-write lithography. This direct-write method compensates radiation mode coupling to first order, significantly reducing bend loss.
By using a grism in a pulse shaping apparatus, we show that it is possible to pre-compensate for large amounts of dispersion (Gt5000 fs2), thus reserving the dynamic range of the pulse shaper for active control.
By incorporating GaAs/AlGaAs based uni-traveling-carrier photodiodes with broadband micromachined monopole antennas, the demonstrated photonic-transmitter can radiate strong sub-THz pulses (20mW peak-power) with a wide bandwidth (100~250GHz), which was measured by another photonic-receiver for ultra-wideband communication.
We present new aspects of temporal dispersion in high resolution Fourier pulse shapers using VIPA based setups as a representative example. These effects should become significant in grating based setups when bandwidths approach an octave.
Pulse shaping theory is extended to include rapid waveform update for line-by-line pulse shaping. The fundamental trade-off between response speed and waveform fidelity is illustrated through simulation.
We present a novel terahertz technique for detecting concealed objects by sensing their individual acoustic phase lags when they perform a minute oscillation. The technique is sensitive to virtually all materials.
We report the fabrication and characterization of identical dielectric whispering gallery microcavites for teraherz (THz) radiation. The THz radiation is coupled via a tapered waveguide into the coupled cavities. Mode splitting is observed.
We present an analytical solution for the reflectivity of a sub-wavelength grating in the case of transverse plane wave incidence and propose a design guideline for maximal reflectivity based on this solution.
We introduce a simple procedure for high-Q cavity design in photonic crystal heterostructures. The key parameter in the optimization process is the relative position of the resonant frequency within the mode-gap.
Zero-nmacr bandgap has been observed in photonic superlattices consisting of layered stack of materials with positive index of refraction and photonic crystal slab. An experimental verification of FDTD simulations is reported here.
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