Introduction: Two-dimensional (2D)-phased vertical cavity surface-emitting laser (VCSEL) arrays offer unique advantages for scaling up single-mode power for high-brightness applications such as fibre laser pumps. They tend, however, to operate in the undesirable out-of-phase mode, which has an on-axis null in the far field [1]. In-phase VCSEL arrays with an on-axis maximum in the far field have...

Semiconductor Disk Lasers (SDLs) are compact lasers suitable for watt to multi-watt direct generation in the 6702350nm waveband and frequency-doubled operation in the ultraviolet and visible regions. This is, however, critically dependent on the thermal management strategy used as, in this type of laser, the pump is absorbed over micrometer lengths and the gain and loss are temperature sensitiv...

High-bandwidth memory 2 (HBM2) vertically stacks multiple dynamic random-access (DRAM) dies to achieve a small form factor and high capacity. However, it is difficult diagnose HBM2 issues owing their structural complexity 2.5D integration with heterogeneous chips. The effects of the temperature at base logic die (TL), refresh interval stacked DRAM dies, were experimentally investigated by count...

The thermal behavior of visible AIGaInP-GaInP ridge laser diodes is investigated numerically and experimentally. It is shown that various parameters critically influence the thermal resistance R of such devices. R is inversely proportional to the thermal conductivity of the heatsink. A substantial improvement in R-quite larger than in the AlGaAs system-is achieved for junction-side-down mountin...

A series of experiments is presented examining the thermo-electro-mechanical response of commercially-available, conditioned, shape memory alloy (SMA) wires (Flexinol®, from Dynalloy, Corp.) during cyclic thermomechanical loading. A specialized experimental setup enables temperature control via a thermoelectric/heatsink in thermal contact with the wire specimen during various modes of testing. ...

The paper addresses the algorithmic and architectural design of digital input power audio amplifiers. A modelling platform, based on a meet-in-the-middle approach between top-down and bottom-up design strategies, allows a fast but still accurate exploration of the mixed-signal design space. Different amplifier architectures are configured and compared to find optimal trade-offs among different ...

An accurate and real-time knowledge of temperatures in insulated-gate bipolar transistor modules is crucial for reliability analysis thermal management power electronic converters. For this purpose, paper establishes an integrated equivalent circuit model comprising self-heating impedances cross-heating to provide a temperature profile the junction solder joints during various operations case a...

The monitoring of processor temperature is crucial to increase its efficiency. One the novel approaches use information not only about CPU (Central Processing Unit) thermal state, but also changing environmental conditions. additional difference sensor monitor changes in environment necessary. dedicated for active heat sink, often used inside laptops, was designed, fabricated and investigated. ...

Improving the power and efficiency of 9xx-nm broad-area laser diodes has a great help in reducing cost systems expanding applications. This letter presents an optimized epitaxial structure with high conversion efficiency. Laser 230 $\mu \text{m}$ </inl...

This paper presents a novel structure of Integrated SiC MOSFETs with high-frequency transformer (I-SiC-HFT) for various high-power isolated DC–DC converters. Several resonant converters are considered integration in this paper, including the phase-shift full-bridge (PSFB) converter, inductor–inductor–capacitor (LLC) bidirectional PSFB and capacitor–inductor–inductor–capacitor (CLLC) converter. ...