Now showing items 51-60 of 101
Resonant-tunneling devices for millimeter-wave generation
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1989-06)
Oscillations from resonant-tunneling diodes have been observed up to 200 GHz, and theoretical estimates predict that device performance should extend into the THz range. This paper addresses the issue of the ultimate ...
Growth phenomena and characteristics of strained InxGa1-xAs on GaAs
(Elsevier, 1989-02-02)
We have investigated the molecular beam epitaxial growth, structural and optical properties of InGaAs on GaAs. We have focused first on the initial stages of growth where the growth is expected to be under coherent strain ...
Hard X-ray generation from solids driven by relativistic intensity in the lambda-cubed regime
(Springer-Verlag, 2006-04)
Interaction of relativistic intensity laser pulses encompassed at focus by a volume of a few wavelengths cubed with solids is examined. Spectroscopy of hard X-rays of several metallic targets, including Cu, Ge, Mo, Ag, and ...
Electro-optic effect in strained and lattice matched multiquantum well structures -- Role of excitonic resonances
(Elsevier, 1990)
The well known quantum confined Stark effect (QCSE) is currently being exploited to design optoelectronic devices based on electric field controlled absorption of photons. QCSE is also responsible for strong below exciton ...
Novel use of resonant tunneling structures for optical and IR modulators
(Elsevier, 1989)
The basic concepts and some preliminary calculations are presented showing the feasibility of high speed optical and infrared modulators based on resonant tunneling structures. A modulator based on a conventional resonant ...
Generation and measurement of >10 8 intensity contrast ratio in a relativistic kHz chirped-pulse amplified laser
(Springer-Verlag, 2005-08)
We report on the generation and measurement of a > 10 8 contrast ratio between main pulse and amplified spontaneous emission (ASE) from a relativistic kHz chirped-pulse amplified laser. We have enhanced the ASE contrast ...
On the design of experiments for the study of relativistic nonlinear optics in the limit of single-cycle pulse duration and single-wavelength spot size
(Nauka/Interperiodica; MAIK "Nauka/Interperiodica" ; Springer Science+Business Media, 2002-01)
We propose a set of experiments with the aim of studying for the first time relativistic nonlinear optics in the fundamental limits of single-cycle pulse duration and single-wavelength spot size. The laser system that makes ...
Phase-matched enhancements of high-harmonic soft X-rays by adaptive wave-front control with a genetic algorithm
(Springer-Verlag, 2004-02)
We demonstrate the enhancement of high-harmonic soft-X-ray generation by adaptive wave-front control of a 745-nm Ti:sapphire laser by use of a 59-channel membrane deformable mirror, combined with a genetic algorithm, for ...
Ultrafast ytterbium-doped bulk lasers and laser amplifiers
(Springer-Verlag, 1999-07)
We review recent achievements with ultrafast bulk lasers and amplifiers based on Yb:YAG and Yb:glass. Special attention is paid to those aspects of the quasi-three-level nature of these gain media that are important for ...
The relation of dominant deep levels in MOCVD AlxGa1-xAs with growth conditions
(Elsevier, 1984-09-01)
High quality undoped AlxGa1-xAs (0 x [les] 0.4) has been investigated by transient capacitance, deep level transient spectroscopy and photoluminescence measurement techniques. The crystals were intentionally grown under ...