Administrative Staff Authors : Recent submissions
Now showing items 681-700 of 840
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All-optical synchronization and frequency division of mode-locked pulses
(1992)We report all-optical synchronization and frequency division of mode-locked input signals, using a selfpulsating laser diode. The performance of mode-locked and sinusoidal input signals are compared. Synchronization ... -
The influence of the unlocked characteristics of a self-pulsating laser diode on synchronization
(1993)All-optical synchronization and timing extraction based on self-pulsating twin section lasers has been demonstrated. We investigate the variation of the unlocked full-widthat- half-maximum of the fundamental of the RF ... -
All optical timing extraction with frequency division using a twin section laser diode.
(1993)All-optical timing extraction from a coded line signal with division of the extracted clock frequency is demonstrated using a single twin-section self-pulsating laser diode. Either the bit-rate clock or a submultiple ... -
Carrier lifetimes in strained InGaAs/(Al)GaAs multiple quantum wells
(1993)The etfect of strain, strain relief, and barrier design on the carrier lifetime in InGaAs/(Al)GaAs multiple-quantum-well samples is investigated. Carriers lifetimes are measured in samples with varying amount of strain, ... -
Strain effect on the optical nonlinearity in an InGaAs/GaAs asymmetric Fabry-Perot modulator.
(American Physical Society, 1993)The effect of strain on the optical nonlinearities and operation of an all-optical asymmetric Fabry-Perot italon is investigated. A high reflectivity modulation of 60% is reported with a contrast ratio of 12.2:1 and ... -
Uncovering the Neural Signature of Lapsing Attention: Electrophysiological Signals Predict Errors up to 20 s before They Occur
(2009)The extent to which changes in brain activity can foreshadow human error is uncertain yet has important theoretical and practical implications. The present study examined the temporal dynamics of electrocortical signals ... -
Growth and characterization of an epitaxially grown ZnSSe/MnZnSSe distributed Bragg reflector
(1995)A Bragg reflector consisting of a 25-period MnZnSSe/ZnSSE Bragg stack is reported. The II?VI semiconductor structure was grown by molecular beam epitaxy on a GaAs ~100! epilayer. Structural characterization of the Bragg ... -
Molecular beam epitaxy growth of MgZnSSe/ZnSSe Bragg mirrors controlled by in situ optical reflectometry.
(1995)In situ optical reflectometry at the wavelength of 488 nm was employed to control the growth of MgZnSSe/ZnSSe Bragg mirror stacks for the blue-green spectral region. 10- and 20-period layer structures of MgZnSSe/ZnSSe ... -
Electro-optic modulation using asymmetric Fabry-Perot laser diode amplifiers.
(1994)We report the use of laser diode amplifiers, whose facets have unequal mirror reflectivities, as asymmetric Fabry-Perot modulators. Due to the presence of optical gain in these devices we observe modulation of reflected ... -
All-optical synchronization of self-pulsating laser diodes
(1996)We examine the behavior of self-pulsating laser diodes when injected with periodic optical signals. We experimentally and theoretically investigate the phase difference between the injected optical signal and the ... -
Very low saturation densities in strained InGaAs/AlGaAs multiple quantum wells
(1994)The saturation of excitonic absorption in strained InGaAs/AlGaAs quantum wells is systematically measured as a function of strain. By comparison with an unstrained GaAs/AlGaAs quantum well sample a reduction by a factor ... -
An experimental and theoretical analysis of jitter in self-pulsating lasers synchronized to periodic electrical signals
(1996)We investigate both experimentally and theoretically the behavior of pulse jitter in compact disk (CD) self-pulsating lasers that have been synchronized to an applied periodic electrical signal. Our investigations reveal ... -
Bistable self-electro-optic operation of strained In0.1Ga0.9As/GaAs asymmetric Fabry Perot modulators
(1991)We report bistable operation of a strained-layer InGaAs/GaAs asymmetric Fabry-Perot optical modulator configured as a self-electro-optic effect device (SEED) operating in reflection mode. Bistable loops are observed from ... -
Effect of temperature on self-pulsation in narrow stripe, gain-guided, compact disk laser diodes
(IEEE, 1998)There is an ongoing strong interest in the development of red self-pulsating lasers for data storage compact disk (CD) applications.? Of particular importance in this mass-market application is that the laser diode ... -
All optical, high contrast absorptive modulation in an asymmetric Fabry-Perot etalon
(American Institute of Physics, 1991)We report a 27:l switching contrast ratio with 2.5 mW of power in an asymmetric Fabry- Perot Ctalon. The modulation is achieved by optical saturation of the excitonic absorption profile of a 95 A GaAs/AlGaAs multiple ... -
Demonstration of high-brightness-mode propagation in a compound waveguide structure
(American Institute of Physics, 1999)We demonstrate the existence of an unusual and useful high-brightness guided mode of a multimode AlGaAs/GaAs heterostructure compound slab waveguide. This mode has a narrow near-field single lobe confined to the low-index ... -
Excitation-induced coherence in a semiconductor microcavity
(American Physical Society, 2002)We measure the dephasing times of high finesse semiconductor microcavities in the strong coupling regime using degenerate four-wave mixing. We find that under certain excitation conditions (near-normal incidence) the ... -
Optical measurement of ion implantation damage depth in multiple-quantum-well mesa structures
(1991)We have determined the depth of ion implant damage in semiconductor materials by nonlinear optical measurements. The carrier lifetime in ion-implanted mesas was measured by the pump-probe technique, and the carrier ... -
Frequency locking and quasiperiodicity in a modulated external cavity injection laser
(American Institute of Physics, 1989)We report the observation of frequency locking and quasiperiodicity in a modulated external cavity injection laser. The order of appearance of the frequency-locked regions follows a Farey sequence as the modulation frequency ... -
Exciton line broadening in CdxZn1?xTe/ZnTe multiple quantum wells
(American Institute of Physics, 1988)We have investigated Cdx Zn1?xTe/ZnTe multiple quantum wells using absorption techniques. We have observed sharp excitonic features at low temperatures which strongly broaden at room temperature. The strength of the ...
