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Showing 1 to 20 of 1582 for “"Doped"”.
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Laser operation of lightly doped and amphoterically doped GaAs
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-27T16:15:53Z No. of bitstreams: 1 1970_dapkus.pdf: 4565886 bytes, checksum: 3eddb947c8f09f150407c28dbb9fb5c6 (MD5)
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Laser Operation of Lightly Doped and Amphoterically Doped Gallium Arsenide
Made available in DSpace on 2015-05-12T22:38:40Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7114721.PDF: 4135395 bytes, checksum: 0bb05d9c0b784fe3d76cdaad136dbb31 (MD5) Previous issue date: 1970
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Mode-locking of thulium-doped and Erbium-doped fiber lasers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Doped Mott Hamiltonians
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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Many-body effects in metals, modulation doped quantum wells and doped semiconductors
… valence hole, which is realized in modulation doped quantum wells or wires. In this case we approximately diagonalize the Hamiltonian by treating exactly the most important terms leading to nonperturbative behavior. The terms neglected are identified and can be treated in perturbation theory. …
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Spin waves in doped graphene
… (xc) effects. We here consider spin waves in doped paramagnetic graphene with adjustable Zeeman-type band splitting. The spin waves are described using time-dependent spin-density-functional response theory, treating dynamical xc effects within the Slater and Singwi-Tosi-Land-Sjolander …
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Heavily doped bulk unipolar structures
… mode. This has entailed the study of heavily doped silicon characteristic which comprises important regions of the multilayer bulk unipolar devices. The devices covered are Camel diodes, P-plane barrier diodes and open-base bipolar transistors. Two operating modes are distinguished: the …
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Spectroscopy of thulium doped silica glass
… at operating wavelengths neighbouring the erbium-doped fibre amplifier. Of the possible candidates, thulium-doped fibre amplifiers appear best suited to serve this need with amplification available from 1460 to 1530 nm. However, the current limitation with these devices is that the amplifying …
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CHARACTERIZATION OF DOPED GALLIUM NITRIDE SUBSTRATES
… the characteristics of five bulk semi-insulated doped gallium nitride samples provided by Kyma Technologies, Inc were explored. The five GaN samples were grown on sapphire substrates by hydride vapor phase epitaxy (HVPE) and doped with different concentrations of iron, hydrogen, carbon, oxygen …
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Carrier relaxation in doped quantum wells
The relaxation time of an electron in a quantum well is derived within the random-phase approximation including full multi-subband and frequency dependent screening. The resulting expression encompasses both electron-electron and electron-phonon scattering taking into account the mutual …
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Molecular recognition of chlorine-doped polypyrrole
… of scFv libraries the surface of chlorine-doped polypyrrole (PPyCl) has been modified to facilitate binding of neuronal phenotype cells. The selection of peptides using phage display found a surface specific recognition peptide (T59) that was made bivalent by altering the C-terminus with an …
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Optical studies of highly-doped GaAs:C
… (200-5000 cm⁻¹) were carried out on heavily-doped GaAs:C films grown by molecular beam epitaxy. With increasing carbon concentration, a broad reflectivity minimum develops in the 1000-3000 cm⁻¹ region and the one-phonon band near 270 cm⁻¹ rides on a progressively increasing high-reflectivity …
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TiO2-doped Ionic Polymer-Metal Composite Actuator
… Although fabrication techniques on the polymer doped with metal oxides for IPMCs have been developed, metal oxide doped ionic polymer membrane through sol-gel preparation has not been studied yet. This process makes the oxide particle well-distributed in the membrane compared to that of physical …
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Stable multiwavelength erbium-doped random fiber laser
Multiwavelength fiber lasers which consist of equally-spaced frequency components have found many applications and that includes as light sources for optical communication systems. One of the techniques available to generate such multiple wavelengths is random fiber lasers. Despite simplicity in …
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Novel rare-earth-doped planar waveguide lasers
… thesis reports a series of studies of rare-earth-doped planar waveguide lasers, exploiting and extending the diverse range of possibilities that can be applied to planar technology. The areas investigated include the characterisation of guided-wave lasers produced by novel fabrication techniques, …
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Tissue-equivalent and nanoparticle doped resin dosimeters
This work had as its main goal the formulation, characterisation and analysis of a new resin dosimeter (RD). This involved the creation of a new, simplified, formula containing resin precursors and a radiochromic dye (leucomalaquite green). The introduction of nanoparticles into the fabrication …
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High-Energy YB-Doped Femtosecond Fiber Lasers
… phase shift, by replacing the short high-doped Yb3+ fiber with a long low-doped one. This results in an increase of the peak power by a factor that depends on the ratio between the gain coefficient of the high- and low-doped Yb3+ fiber. The length of the nonlinear section is kept unchanged …
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Hydrogen sorption in palladium doped microporous materials
… the hydrogen uptake of bridged and chemically doped porous materials at room temperatures. XRD, Temperature Programmed Desorption and hydrogen sorption measurements were used to characterise the as-received and palladium doped porous materials. The hydrogen uptakes of as-received Maxsorb …
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