We apply the modal coherence theory to evaluate the spatial mode structure of a 2×2 phase-coupled array of vertical cavity surface emitting lasers (VCSELs). The eigenmode structure is extracted for different pump currents by measuring the degree of spatial coherence of all VCSEL pairs in the array. The results reveal the impact of optical disorder and spatial hole burning on the modal discrimin...

The data obtained by the laser-based angle-resolved photoemission spectroscopy (ARPES) system in Dan Dessau’s lab depends on a small wire array inside the machine. The current model of the slit array ages with time and could be improved. One method of preventing aging of the outer layer of the slit array includes changing the fabrication process and material with which its made. This new slit a...

Laser-activated membrane introduction mass spectrometry (LAMIMS), a high-throughput screening method, evaluates heterogeneous catalysts under realistic reactor conditions. It is a precise, versatile system requiring no moving parts. The catalyst array is supported on carbon paper overlaid upon a silicone rubber membrane configured in a variation of membrane introduction mass spectrometry as int...

optical interferometry is being used as an efficient tool to analyse smooth surfaces for more than a century. although, due to introduction of novel computer assisted analyzing techniques and array detectors, like ccd, the speed and the precision of processing have been increased tremendously, but the main equation involved is not changed. the main equation is the intensity distribution in the ...

Title of Dissertation: ANALYSIS AND EXPERIMENTAL DEMONSTRATION OF CONFORMAL ADAPTIVE PHASE-LOCKED FIBER ARRAY FOR LASER COMMUNICATIONS AND BEAM PROJECTION APPLICATIONS Ling Liu, Doctor of Philosophy, 2008 Dissertation Directed By: Professor Mikhail A. Vorontsov Institute for Systems Research and Department of Electrical and Computer Engineering, University of Maryland at College Park The primar...

Quantum cascade lasers (QCLs) have become important laser sources for accessing the mid-infrared (mid-IR) spectral range, achieving watt-level continuous wave operation in a compact package at room temperature. However, up to now, wavelength tuning, which is desirable for most applications, has relied on external cavity feedback or exhibited a limited monolithic tuning range. Here we demonstrat...

PURPOSE To evaluate higher order aberrations and contrast sensitivity after LASIK, implantation of the Verisyse phakic intraocular lens (IOL), and refractive lens exchange with the Array multifocal IOL. METHODS In a prospective, non-randomized case series, LASIK was performed in 20 eyes with the Technolas 217z excimer laser (Bausch & Lomb, Rochester, NY), a Verisyse phakic IOL (AMO Inc, Santa...