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A review will be given on the latest development of 1.55 µm quantum dot lasers. Static and dynamic properties of short cavity ridge waveguide lasers will be presented exhibiting data rates up to 22 GBit/s. The impact of structural and operational parameters will be discussed and compared with a simulation model. High-resolution linewidth measurements of distributed feedback lasers indicate with <...
Red, green and blue distributed feedback lasers based on dense colloidal CdSe quantum dot thin films were optically pumped in quasi-steady state. The red lasers showed 32% internal quantum efficiency and 400 µW output power.
A new Mode Partition Noise model for VCSEL-based optical links capturing RIN and MPN via a covariance matrix is proposed and experimental parameter extraction is performed. The model removes Ogawa-Agrawal model assumptions inappropriate for VCSELs.
Generation of tunable millimeter-wave (MMW) and Terahertz (THz) signals from 117 GHz to 954 GHz is experimentally demonstrated with a 1310 nm Quantum Dot Distributed Feedback laser subject to single beam optical injection.
Simulations using a microscopic, nonequilibrium, semiconductor laser model show that the long-established α-factor concept breaks down in quantum-dot lasers, especially under complex dynamic scenarios, such found during high-excitation or optical-injection operations.
The four-wave mixing (FWM) analysis is successfully applied on the injection-locked quantum dot (QD) laser for linewidth enhancement factor extraction. The rate equation model of the QD lasers is simplified and the analytical model for the FWM analysis is derived and verified. By fitting the experimentally obtained regenerative signals and power spectrum signals at different detuning frequencies with...
A standard deviation in lasing wavelength lower than 500pm is characterized on nominally identical and optically-pumped microdisk lasers, heterogeneously integrated on the same SOI circuit. This lasing wavelength uniformity is obtained using electron-beam lithography.
We propose a hybrid silicon laser and photodetector system that can emulate the electro-physiological behavior of a real neuron at ultrafast time-scales. Networks of lasers would scale up easily using a silicon III–V wafer-bonding platform.
We demonstrate a platform for monolithic integration of active and low loss passive components. The passive section is realized by removal of the quantum wells. Characterization results of lasers with passive DBR reflectors are presented.
We present a truxene-based distributed feedback laser sensor and demonstrate its sensing capabilities. Results for bulk refractive index sensing, detection of nano-layer adsorption at the laser surface and specific biomolecule sensing are shown.
Taking advantage of some of unique optical properties of crystalline materials, we explore use of crystalline whispering gallery mode resonators for laser frequency stabilization, nonlinear frequency conversion, and low threshold UV laser.
Composite metal-dielectric-semiconductor nanostructures are used to design, fabricate and test nanoscale resonators and nanolasers that utilize various modes confined in all three dimensions. Integration with silicon photonics material platform is also explored and experimentally validated.
We develop robust computational methods that can rapidly determine the existence and stability of pulses in passively modelocked laser systems over a broad parameter range. We apply these methods to laser systems with several different models of fast saturable absorption.
We present our work on developing a new class of photonic devices realized by selective coupling of degenerate modes in microring resonators using gratings. Engineering the reflection spectrum and the radiation quality factor are demonstrated.
We propose a new design for buried heterostructure photonic crystal nanocavity lasers with in-line coupled output waveguides and coupling buffer regions. This design enables us to realize single-mode lasing and a high output power for a current-injected nanolaser.
A distributed antenna-coupling scheme for THz quantum cascade lasers is introduced. Single-mode emission in a narrow beam pattern, with an order of magnitude increase in output power is predicted compared to previous distributed-feedback schemes.
We theoretically demonstrate that mid-infrared ultra-short pulses can be created from quantum cascade structures having two-section cavities, where one of the sections is a gain medium and the other is a resonant absorbing medium.
We review high power semiconductor laser development at the Ferdinand-Braun-Institut, focusing on studies to improve material quality, design development for peak performance in standard structures and the development of novel device concepts for new applications.
Distributed feedback lasers with an integrated thin-film of palladium have been fabricated and measured. Palladium's refractive index changes when exposed to hydrogen gas, producing a wavelength redshift and power increase proportional to hydrogen concentration.
Lasers with self-similar evolution of the pulse in the gain medium can tolerate strong spectral breathing. This property can be exploited in a fiber laser to generate pulses much shorter than the gain-bandwidth limit.
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