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 11 of 11 for “"coherent emission"”.
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Three-dimensional simulation of coherent inverse Compton scattering
Novel compact X-ray sources using coherent ICS have the potential to positively impact a wide range of sectors by making hard x-ray techniques more accessible. However, the analysis of such novel sources requires improvements to existing simulation routines to incorporate Coulomb forces among …
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Exciton Dynamics and Optical Properties of Lead Halide Perovskite Nanocrystals: From Nanorods to Nanocubes
… mechanisms that could reduce superradiant and coherent emission in order to promote rational design and future integration of these nanocrystals into quantum information devices.
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The transistor-injected quantum cascade laser
… cascade laser has become the most important coherent emission source for mid-infrared and terahertz ranges. The quantum cascade laser is a unipolar semiconductor laser that utilizes electron transitions between quantized states in the conduction band for optical emission. Due to the unipolar …
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Control of Optical Processes in Diamond using Plasmonic Nanogap Cavities
… is to utilize the Purcell effect to improve the emission rate, directionality and brightness of quantum emitters, as long decay times, nondirectional emission and weak fluorescence limit their applications. One particularly promising emitter is the silicon vacancy (SiV) in diamond, which offers …
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Smith Purcell radiation from femtosecond electron bunches
… with the radiation wavelength, resulting in coherent emission with an enhancement by a factor of Ne the number of electrons in the bunch. Finally, the electron beam consists of a regular train of Nb bunches, resulting in an energy density spectrum that is restricted in frequency space to …
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Towards a free-electron laser driven by a laser wakefield accelerator
… laser (FEL) is a powerful source of tuneable coherent radiation that currently demands kilometre-scale beam lines for high-energy vacuum ultraviolet (VUV) and X-ray output. Driving an FEL with a laser wakefield accelerator (LWFA) electron beam would radically reduce the size of such systems as …
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Orbital Angular Momentum Microlasers: From The First Demonstration To Ultrafast Tunability
… However, conventional microlaser designs offer coherent emission with rather simple polarization/phase states and suffer from instability. In this work, we bring the non-Hermitian physics into the regime of nanophotonics to explore feasible designs of OAM microlasers. Non-Hermitian photonics …
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A Play of Light and Spins: Excitation and Detection of Non-linear Magnetization Dynamics using Light
… than the decay time of the magnons, sustained coherent emission of selected SW modes was observed. The BLS counts versus laser power follows a stronger than square dependence. This is in accordance with the Bloch T3/2 law. The spatial map of the SW amplitude depicts strong unidirectional …
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Tailoring the emission of stripe-array diode lasers with external cavities to enable nonlinear frequency conversion
A huge number of applications require coherent radiation in the visible spectral range. Since diode lasers are very compact and efficient light sources, there exists a great interest to cover these applications with diode laser emission. Despite modern band gap engineering not all wavelengths can …
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Active and Fast Tunable Plasmonic Metamaterials
… composite material can produce a thermal coherent emission at the mid-infrared wavelength range and enable active and fast-tunable optoelectronic devices. Therefore, this work focused on the integrated thermal infrared light source platforms for various applications such as thermal …
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Multi-Mode Dynamics in Transverse-Coupled-Cavity VCSELs
L'abstract è presente nell'allegato / the abstract is in the attachment