Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"two-section"”.
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Ultrashort, High Power, And Ultralow Noise Mode-locked Optical Pulse Generation Using Quantum-dot Semiconductor Lasers
… characteristics of FP laser, SOA, and monolithic two-section devices. Short pulse generation from an external cavity mode-locked QD two-section diode laser is studied. High quality, sub-picosecond (960 fs), high peak power (1.2 W) pulse trains are obtained. The sign and magnitude of pulse chirp …
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Quantum dot gain-lever laser diode
… of the gain versus carrier density. Previously, two-section quantum well lasers have been investigated theoretically and experimentally to explore the gain lever effect. As for QD devices, which are extremely promising because of the strong gain saturation effect in dots, have not been …
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Novel Approaches to Power Scaling In Mode-Locked Laser Diode Based Ultrashort Pulse Sources
In this thesis, two novel approaches to upscaling the average output power of mode-locked laser diode ultrashort pulse sources were investigated. This was done with the motivation of developing mode-locked laser diode based light sources for nonlinear bioimaging applications to which high …
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Theoretical and Experimental Investigation of the Nonlinear Dynamical Trends of Passively Mode-Locked Quantum Dot Lasers
… combined to investigate the dynamical trends of two-section passively mode-locked quantum dot lasers. On the theoretical side, a novel numerical modeling scheme based on a previously developed theoretical model is presented as a powerful and versatile framework to study the nonlinear dynamics …
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Plasmonic devices for manipulating light at the nanoscale: slow-light waveguides and compact couplers
… The system consists of a periodic array of two metal-dielectric-metal (MDM) stub resonators side-coupled to a MDM waveguide. Decreasing the frequency spacing between the two resonances increases the slowdown factor and decreases the bandwidth of the slow-light band. I also show that there is …
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Techniques for high-speed direct modulation of quantum dot lasers
… include a p-doped active region in single-section QD lasers, the gain-lever effect in two-section lasers and the injection-locking technique. Firstly, the modulation performances of p-doped InAs/GaAs QD lasers were studied. Contrary to the theoretical predictions, the modulation efficiency …
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A Compact RF/Photonic Antenna using a Quantum Dot Mode Locked Laser as a Source
… with a quantum dot mode-locked laser (QDMLL). A two-section QDMLL is used to produce pulsed microwaves signals to feed the radiating antenna. To realize the microwave signal radiation generated by the QDMLL, several possible MLL-integrated-antennas are proposed. The prototype integrated antenna …
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High-Speed Optical Sampling Techniques Enabled By Ultrafast Semiconductor Lasers
… are theorised and demonstrated using quantum dot two-section passively mode-locked laser diodes (MLLDs) as an inexpensive and compact source of ultrashort light pulses on the order of a few picoseconds duration.<br/><br/>The first technique, OSBERT (Optical Sampling By Electronic Repetition-Rate …
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A multi-variate analysis of Indiana school board member attitudes : concerning controversial educational practices and issues
… attitudes of board members were obtained from a two-section instrument. Section I contained items designed to elicit information pertaining to the background characteristics of board members, while Section II contained a modified version of Education Scale VII that was employed for assessing …
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An analysis of trends and conditions in school districts with black superintendents and a composite profile of the black superintendent at his/her initial appointment
… and the Joint Center for Political Studies. The two-section instrument used in the study was developed by the researcher. The first section collected biographical data used to establish the superintendent's profile. The second part of the instrument consisted of 30 Likert type statements used to …
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Numerical study on scaling effects and decoupled network-based simulation of gaseous explosion
… simulations in a full-scale underground network using a decoupled method. To provide quick predictions of overpressure distribution of methane explosions in underground airway networks, a two-section theory is employed. The explosion space is divided into a driver section and a blast-wave …
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The social relationships among adults in a troop of free-ranging baboons (Papio cynocephalus ursinus).
… could not be determined (see also Chapter Two, Section II., A. ). In justification of my approach, however, I feel that the social organization and behaviour of free- ranging primates are the result of natural selection acting on individuals through both their physical and their social …
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High power ultra-short pulse Quantum-dot lasers
In this thesis, novel multi-section laser diodes based on quantum-dot material are designed and investigated which exhibit a number of advantages such as low threshold current density; temperature-insensitivity and suppress carrier diffusion due to discrete nature of density of state of …
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TIME DOMAIN CHARACTERIZATION OF MONOLITHIC QUANTUM DOT PASSIVELY MODE-LOCKED LASERS
… of the saturable absorber and amplifying gain section in a two-section device, and therefore it is not readily apparent how these devices will perform over broad temperature excursions. In this dissertation, a detailed study is presented on a series of quantum dot passively mode-locked lasers …
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Computational Model for Pedestrian Movement and Infectious Diseases Spread During Air Travel: A Molecular Dynamics-Like Numerical Approach
… pedestrian-to-pedestrian contacts. For instance, two-section boarding leads to lower infections whereas all deplaning strategies have a similar effect. Winding queues configurations at security checkpoints or theme parks have a major effect on pedestrians’ interaction. A queue of two-zones with …
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Alone and Unafraid: Observations on Functional Leader Intervention in Decentralized Organizations
… team of twelve individuals: One manager, two section leaders and nine team members. The study employed a participatory observational inductive ethnography in which I shadowed a lead manager and made observations on coaching and leadership interventions. In this thesis, I provide a brief …
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Solving a social dilemma using behaviourally framed text messaging to increase school fees contribution in public schools in South Africa
… from a randomised controlled trial conducted in two Section 21 schools in Cape Town, South Africa, to test whether text messages can improve the fee-payment behaviour of parents. Parents who were randomly assigned to one of two treatment groups received a monthly behaviourally framed message …
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Microwave techniques and applications for semiconductor quantum dot mode-locked lasers
… verified for the cavity design of semiconductor two-section passive MLLs. This model will also be useful in designing the next generation quantum dot (QD) MLL capable of stable operation from 20°C to 100°C for optical interconnects applications. The compact optical generation of microwave signals …
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Factors related to the attitude toward the FFA of eastern region secondary agricultural teachers
… sample responded to the survey instrument. The two-section instrument used in the study was developed by the researcher. The first section of the instrument consisted of ten questions designed to obtain personal and departmental information about the respondents. The second part of the …
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True linearized intensity modulation for photonic analog to digital conversion using an injection-locked mode-locked laser
… intensity modulator has been built by using two identical two-section mode-locked lasers with the same length, one as the slave laser in one of the arms of the Mach-Zehnder interferometer injection-locked to the other one as the master which is the input light to the modulator. A low V? of …
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