Papers by Patrick Leisching
Extremely Fast Thickness Measurements with an ECOPS-Based TD-THz System
2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2018
We employed a time-domain terahertz system based on electronically controlled optical sampling to... more We employed a time-domain terahertz system based on electronically controlled optical sampling to measure the thickness of a piece of a silicon wafer. The system acquired 1600 terahertz pulse traces per second, which - to the best of our knowledge - represents the fastest thickness measurement achieved with any terahertz system to-date. We compare the results to values measured with a conventional terahertz system and a micrometer gauge.
Frequency-tunable two-color ultrafast fiber laser for nonlinear excitation of NADH and FAD
Multiphoton Microscopy in the Biomedical Sciences XX, 2020
We will present our latest innovations about ultrafast fiber lasers and show how multiphoton micr... more We will present our latest innovations about ultrafast fiber lasers and show how multiphoton microscopy can benefit from these developments. Wavelengths around 900 nm and pulse durations as short as 100 fs remain a challenge for fiber lasers. Here we present a two-color femtosecond fiber laser system with synchronous outputs. One arm emits pulses at a central wavelength of 780 nm and the novel second laser arm is continuously tunable in its central wavelength between 810 nm and 950 nm. This allows the independent excitation of NADH and FAD and therefore enables optical metabolism and oxygen imaging of cells via FLIM and PLIM measurements.
Optical Filter, Adjustable Add-Drop-Continue Module and Circuit for Bundled Cross-Connect Functionality
Optical Add Drop and Dispersion Compensation Apparatus and Method Thereof
Optical add drop and dispersion compensation apparatus
Adjustable Add-Drop-Continue Module
Add/drop-drop and continue-module and drop and continue module
Physical Review B, 1995
We report on the observation of an electric-field-induced electric dipole moment of biexcitonic m... more We report on the observation of an electric-field-induced electric dipole moment of biexcitonic molecules in a GaAs/A1036a07As superlattice. The macroscopic oscillating electric field, associated with the microscopic vibronic wave-packet dipole moments, is monitored by time-resolved transmittive electro-optic sampling. The field dependence of the biexcitonic binding energy is detected by transient four-wave mixing. From this experiment, an ultrafast nonresonant excitation mechanism of biexcitons is inferred.
Bloch Oscillations of Excitonic and Continuum States in Superlattices
Laser in Forschung und Technik / Laser in Research and Engineering, 1996
The investigation of the coherent dynamics of optically excited wavepackets and the associated ma... more The investigation of the coherent dynamics of optically excited wavepackets and the associated macroscopic polarizations in high quality GaAs/AlGaAs semiconductor superlattices has gained considerable interest during the last years [1]. It is both of fundamental and technological interest:this system is especially well suited for the investigation of the dephasing mechanisms of the phase coherence and the nonlinear Coulomb interactions observed in different polarizations. The coherent dynamics of the microscopic wavepacket dipoles might be a future practical source of tunable coherent radiation in the THz regime [2].
Optical plug-type connection
System for suppressing instabilities in an optical wavelength division multiplex ring network
Modular expandable optical add-drop module
The roadmap to next generation Ethernet: 100-Gigabit-Ethernet with integrated optical-electrical high-speed circuits
Optical filter, adjustable add-drop-continue module and circuit for bundled cross-connection functionality
Network Nodes with Optical Add/Drop Modules
Photonic Network Communications, 2001
Dense wavelength division multiplexing (DWDM) is the key technology for future data transport. It... more Dense wavelength division multiplexing (DWDM) is the key technology for future data transport. It combines transmission of data rates up to several Tb/s [1] with an overall transparency to data format and bit rate. The expected huge bandwidth demand in the near future requires an adaptability of DWDM transmission technology to metropolitan networks. Therefore, dynamically configurable DWDM transmission technology for
Germany-wide DWDM field trial: transparent connection of a long haul link and a multiclient metro network
OFC 2001. Optical Fiber Communication Conference and Exhibit. Technical Digest Postconference Edition (IEEE Cat. 01CH37171)
In optical networks using dense wavelength-division-multiplexing (DWDM) systems, channel numbers ... more In optical networks using dense wavelength-division-multiplexing (DWDM) systems, channel numbers and data rates have been constantly increased. Point-to-point optical transport systems with capacities of up to 7 Tb/s (176 x 40 Gb/s) [1] and 0.8 Tb/s wavelength routing (80 x 10 ...
Ultrafast nonlinear opties in semimagnetic Hg0.6Mn0.4Te at 1.55 µm
<title>The vision of optical networking: tales and realities of the OPEX/CAPEX analysis</title>
Performance, Quality of Service, and Control of Next-Generation Communication and Sensor Networks III, 2005
The different flavors of today's and future multilayer transmission networks are analyzed hig... more The different flavors of today's and future multilayer transmission networks are analyzed highlighting the main infrastructure, capital expenditure (CAPEX) and operational expenditure (OPEX) contributions to total cost of ownership (TCO). Depending on different carrier requirements, critical parameters and general design rules for optimum overall cost positions are discussed. To illustrate and evaluate the impact of given boundary conditions, some case studies will be presented where new technologies lead to significant OPEX/CAPEX savings.
Observation of Bloch oscillations in a GaAs/ALGaAs superlattice
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Papers by Patrick Leisching