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Nano-optical analysis of GaN-based diode lasers
/forschung/publikationen/nano-optical-analysis-of-gan-based-diode-lasers
Near-field scanning optical microscopy (NSOM) is applied for analyzing GaN-based diode lasers. The measurements are carried out at the front facets of standard devices without any additional…
Studies of limitations to lateral brightness in high power diode lasers using spectrally-resolved mode profiles
/forschung/publikationen/studies-of-limitations-to-lateral-brightness-in-high-power-diode-lasers-using-spectrally-resolved-mode-profiles
Efficient DFB broad-area lasers enable spectrally-resolved measurements of lateral field profiles to high powers, indicating brightness is limited by both increasing numbers of guided modes and…
Design optimisation of high-brightness laser diodes for external cavity operation in the BRIDLE project
/forschung/publikationen/design-optimisation-of-high-brightness-laser-diodes-for-external-cavity-operation-in-the-bridle-project
We report on the design aspects of high performance diode lasers for application in high-brightness spectral beam combining and coherent beam combining modules. Key performance trade-offs are…
Experimental Investigation of Limits to Slow Axis Beam Quality in High Power Broad Area Diode Lasers
/forschung/publikationen/experimental-investigation-of-limits-to-slow-axis-beam-quality-in-high-power-broad-area-diode-lasers
An experimental study of factors limiting lateral beam parameter product (BPP) in broad area lasers is presented. BPP is an approximately linear function of self-heating, whose dependence on design,…
Factors influencing brightness and beam quality of conventional and distributed Bragg reflector tapered laser diodes in absence of self-heating
/forschung/publikationen/factors-influencing-brightness-and-beam-quality-of-conventional-and-distributed-bragg-reflector-tapered-laser-diodes-in-absence-of-self-heating
In this study, the authors examine some of the factors affecting the brightness and the beam quality of high-power tapered lasers. The large volume resonators required to achieve high-power,…
Design of Waveguide Manifold Multiplexers with Dual-Mode Filters Using Distributed Models
/forschung/publikationen/design-of-waveguide-manifold-multiplexers-with-dual-mode-filters-using-distributed-models
A novel multiplexer design technique which makes use of distributed models is proposed. For the first time, dis- tributed models of dual mode filters are applied to the design of manifold…
Highly Efficient 200-GHz Fixed-Frequency Fundamental Source in Transferred-Substrate InP DHBT Technology
/forschung/publikationen/highly-efficient-200-ghz-fixed-frequency-fundamental-source-in-transferred-substrate-inp-dhbt-technology
A 197-GHz fixed-frequency fundamental oscillator with high efficiency is presented, realized using a transferred-substrate InP-DHBT process. It delivers 0 dBm output power, with a phase noise of -88…
Iterative Design of a Harmonically Tuned Multi-Octave Broadband Power Amplifier
/forschung/publikationen/iterative-design-of-a-harmonically-tuned-multi-octave-broadband-power-amplifier
This article presents the design approach, realization and measurement results of a highly efficient double octave wideband power amplifier using a GaN-HEMT bare-die. An iterative approach to obtain…
InP-Si BiCMOS Heterointegration Using a Substrate Transfer Process
/forschung/publikationen/inp-si-bicmos-heterointegration-using-a-substrate-transfer-process-1
Broadband transmitters for radio links in the millimeter band are key building blocks for future wireless communication systems. Such components can be realized by means of an InP-on-BiCMOS…
Reference Plane Transformation of Continuous Mode Terminations for Broadband Power Amplifiers
/forschung/publikationen/reference-plane-transformation-of-continuous-mode-terminations-for-broadband-power-amplifiers
In this article the behavior of continuous mode amplifiers at different reference planes is discussed using the example of a continuous class-F-1 amplifier mode. The variation of the output…