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The last decade has seen a lot of progress in attosecond science and high field physics. Generating energetic, few-cycle laser pulses with a stabilized Carrier-Envelope Phase (CEP) constitutes the first step to access the ultrafast dynamics underlying the interaction of matter with intense, ultrashort coherent light source [1-2]. All these developments place rising demands on lasers with higher average...
A major limitation in high-power three-dimensional chip stacks is the heat removal of dissipated power. To this end, highly thermally conductive intra-stack bondlines are required. Percolating thermal underfills (PTUs), where densely packed micron-sized dielectric particles fill the open space resulting from the electrical interconnects between individual chips, are expected to improve the effective...
Pseudospark electron beams of micro-sizes have been measured recently and their application to millimeter-wave and terahertz radiation generation is being investigated. A three cavity 94 GHz klystron using a micro-sized beam has been designed and simulated and is currently being constructed.
A small-scale pseudospark discharge is being investigated as the electron beam source for a klystron operating at a frequency of 94 GHz and single-gap discharge experiments have been carried out. The klystron has been designed using the particle-in-cell (PiC) code MAGIC-2D and simulated output looks promising.
The aging of the epoxy-paper insulation of an oil-impregnated transformer was studied through partial discharge analysis. Accelerated electrical aging tests were carried out on samples of transformers windings, with and without paper insulation. Partial discharge (PD) measurements according to standard IEC 60270 were performed periodically during aging, and partial discharge phase patterns were recorded...
A concave tapered DFB semiconductor laser based on reconstruction-equivalent-chirp (REC) technology was designed and experimentally demonstrated for the first time to the best of our knowledge. As predicted theoretically, the concave tapered DFB laser with a π phase shift can suppress the spatial hole burning effectively. But the realization of such lasers has not been reported up to now to our knowledge...
A multicavity microklystron operating in the terahertz region has been designed and simulated. This microklystron will be driven by an electron beam sourced by a down-scaled pseudospark discharge.
Based on previous experimental investigations on pseudospark (PS) discharges, a small-scaled PS electron beam source was conceived to drive a 200 GHz microklystron. Recent PS e-beam experiments producing a beam of 1 mm in diameter and klystron interaction simulations will be presented. The microklystron will be fabricated using micro-electro-mechanical systems (MEMS) construction techniques.
A novel microwave WIM sensor is presented in this paper. The microwave WIM sensor is an active sensor based on the perturbation theory of microwave resonant cavities. The microwave signal generated by a DDS-based synthesizer circuit is coupled into the sensor and the returned signal is measured to determine the load applied to the sensor. The microwave WIM sensor was designed, simulated and tested...
Performance optimisation of ultra-long Raman laser links is studied theoretically and experimentally. We observe that it is possible to reduce signal power excursion by adjusting FBG reflectivity without compromising pump efficiency.
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