M. Steinke
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View article: Unambiguous calibration of power dependence in ratiometric luminescent nanothermometry through multiple intensity ratios and symbolic regression
Unambiguous calibration of power dependence in ratiometric luminescent nanothermometry through multiple intensity ratios and symbolic regression Open
Calibration of excitation power dependence in ratiometric luminescent nanothermometers can be made superfluous through symbolic regression of multiple intensity ratios. We showcase this for the well-known NaYF4:Yb 3+ ,Er 3+ upconversion na…
View article: Bendable Fiber Lens for Minimally Invasive Endoscopy
Bendable Fiber Lens for Minimally Invasive Endoscopy Open
Fiber‐based endoscopy holds unique and breakthrough potential for translating conventional microscopy to minimally invasive applications. An outstanding example is in vivo all‐optical cancer diagnostics, which mitigates patient safety risk…
View article: Direct and indirect effects of copepod grazers on community structure
Direct and indirect effects of copepod grazers on community structure Open
Ecological theory and empirical research show that both direct lethal effects and indirect non-lethal effects can structure the composition of communities. While the direct effects of grazers on marine phytoplankton communities are well st…
View article: Restrictions on UK aquaculture of Pacific oyster (Magallana gigas) will not prevent naturalised spread but suppress ecological and economic benefits to coastal communities
Restrictions on UK aquaculture of Pacific oyster (Magallana gigas) will not prevent naturalised spread but suppress ecological and economic benefits to coastal communities Open
The Pacific oyster (Magallana (Crassostrea) gigas) was introduced to UK waters in the mid 20th century and currently accounts for over 95% of UK oyster fishery landings. Recently however, its non native origin has led policy makers to cons…
View article: Immediate and delayed effects of a heatwave and Prorocentrum lima ((Ehrenberg) Stein 1878) bloom on the toxin accumulation, physiology, and survival of the oyster Magallana gigas (Thunberg, 1793)
Immediate and delayed effects of a heatwave and Prorocentrum lima ((Ehrenberg) Stein 1878) bloom on the toxin accumulation, physiology, and survival of the oyster Magallana gigas (Thunberg, 1793) Open
Warming could facilitate the intensification of toxic algal blooms, two important stressors for marine organisms that are predicted to co-occur more frequently in the future. We investigated the immediate and delayed effects of a heatwave …
View article: Microfluidic Filling and Spectroscopy of Colloidal CdSe/CdS Nanoplatelets in Liquid Core Fibers
Microfluidic Filling and Spectroscopy of Colloidal CdSe/CdS Nanoplatelets in Liquid Core Fibers Open
Colloidal 2D semiconductor nanoplatelets are highly efficient light emitters, which exhibit large absorption and emission cross sections, and constitute promising laser gain media. However, if dispersed in solutions, such nanoplatelets lac…
View article: Optical emission characterization of liquid core fibers filled with colloidal nanoplatelets
Optical emission characterization of liquid core fibers filled with colloidal nanoplatelets Open
Fig 1 a) TEM image of the CdSe/
View article: Bulk-like emission in the visible spectrum of colloidal LiYF<sub>4</sub>:Pr nanocrystals downsized to 10 nm
Bulk-like emission in the visible spectrum of colloidal LiYF<sub>4</sub>:Pr nanocrystals downsized to 10 nm Open
Herein, highly stable colloidal LiYF 4 :Pr 3+ nanocrystals are presented for the first time. Through extensive comparison of their spectroscopic behavior with bulk crystals an unusual intense bulk like emission in the visible spectrum was …
View article: Full-Vectorial Fiber Mode Solver Based on a Discrete Hankel Transform
Full-Vectorial Fiber Mode Solver Based on a Discrete Hankel Transform Open
It is crucial to be time and resource-efficient when enabling and optimizing novel applications and functionalities of optical fibers, as well as accurate computation of the vectorial field components and the corresponding propagation cons…
View article: Highly-Integrated Signal and Pump Combiner in Chirally-Coupled-Core Fibers
Highly-Integrated Signal and Pump Combiner in Chirally-Coupled-Core Fibers Open
Integrated fiber components enable compact and robust laser systems but are usually not available with specialty fibers. However, specialty fibers allow power scaling of fiber lasers and amplifiers with all advantages of these fiber design…
View article: Absorption and multi-phonon quenching in nanocrystal doped SiO<sub>2</sub> fibers
Absorption and multi-phonon quenching in nanocrystal doped SiO<sub>2</sub> fibers Open
SiO 2 fibers doped with rare-earth-doped nanocrystals are promising to overcome the strong SiO 2 multi-phonon quenching and could yield novel laser gain materials. So far, no attention has been paid to the question how well the nanocrystal…
View article: Broadband excess intensity noise due to an asymmetric Brillouin gain spectrum in optical fibers
Broadband excess intensity noise due to an asymmetric Brillouin gain spectrum in optical fibers Open
Stimulated Brillouin scattering is one of the predominant limitations for fiber-based narrowband lasers, amplifiers, or passive transmission links. In addition to the output power limitation, stimulated Brillouin scattering imprints a broa…
View article: Experimental and numerical study of interlock requirements for high-power EYDFAs
Experimental and numerical study of interlock requirements for high-power EYDFAs Open
In this work, we studied the interlock requirements in a seed failure scenario for Er 3+ :Yb 3+ doped fiber amplifiers (EYDFAs) pumped with high intensities in the MWcm −2 range at 9XX nm. We fed a time-dependent FEM-tool with the data fro…
View article: High power, single-frequency, monolithic fiber amplifier for the next generation of gravitational wave detectors
High power, single-frequency, monolithic fiber amplifier for the next generation of gravitational wave detectors Open
Low noise, high power single-frequency lasers and amplifiers are key components of interferometric gravitational wave detectors. One way to increase the detector sensitivity is to increase the power injected into the interferometers. We de…
View article: Characterization of the monolithic fiber amplifier engineering prototype for the next generation of gravitational wave detectors
Characterization of the monolithic fiber amplifier engineering prototype for the next generation of gravitational wave detectors Open
Single-frequency Yb3+ fiber amplifiers operating at 1064 nm are promising candidates to fulfill the challenging requirements for laser sources of the next generation of interferometric gravitational wave detectors. We present the current d…
View article: Long-Period Gratings in Highly Germanium-Doped, Single-Mode Optical Fibers for Sensing Applications
Long-Period Gratings in Highly Germanium-Doped, Single-Mode Optical Fibers for Sensing Applications Open
Long-period fiber gratings (LPGs) are well known for their sensitivity to external influences, which make them interesting for a large number of sensing applications. For these applications, fibers with a high numerical aperture (i.e., fib…
View article: Recent progress on monolithic fiber amplifiers for next generation of gravitational wave detectors
Recent progress on monolithic fiber amplifiers for next generation of gravitational wave detectors Open
Single-frequency fiber amplifiers in MOPA configuration operating at 1064 nm (Yb3+) and around 1550 nm (Er3+ or Er3+:Yb3+) are promising candidates to fulfill the challenging requirements of laser sources of the next generation of interfer…
View article: Manufacturing and characterization of asymmetric evanescent field polished couplers for grating assisted mode selective fiber coupling
Manufacturing and characterization of asymmetric evanescent field polished couplers for grating assisted mode selective fiber coupling Open
Mode division multiplexing (MDM) could bring a technological progress in the field of optical telecommunication by increasing the data transmission bandwidth. A key challenge for enabling MDM lies in manufacturing of efficient and cost-eff…
View article: Single-frequency fiber amplifier at 15 µm with 100 W in the linearly-polarized TEM_00 mode for next-generation gravitational wave detectors
Single-frequency fiber amplifier at 15 µm with 100 W in the linearly-polarized TEM_00 mode for next-generation gravitational wave detectors Open
Next-generation gravitational wave detectors require single-frequency and high power lasers at a wavelength of 1.5 µm addressing a set of demanding requirements such as linearly-polarized TEM00 radiation with low noise to run for long peri…
View article: Influence of the third energy level on the gain dynamics of EDFAs: analytical model and experimental validation
Influence of the third energy level on the gain dynamics of EDFAs: analytical model and experimental validation Open
We report an analytical model and experimental validation of the temporal dynamics of 3-level system fiber amplifiers. The model predictions show a good agreement with the measured pump power to output power and the pump power to output ph…
View article: Analysis of the WN star WR 102c, its WR nebula, and the associated cluster of massive stars in the Sickle Nebula
Analysis of the WN star WR 102c, its WR nebula, and the associated cluster of massive stars in the Sickle Nebula Open
\n Context. The massive Wolf-Rayet type star WR 102c is located near the Quintuplet Cluster, one of the three massive star clusters in the Galactic centre region. Previous studies indicated that WR 102c may have a dusty circumstellar nebul…
View article: All-fiber Combining Concepts in the Wavelength Range Around 2 µm
All-fiber Combining Concepts in the Wavelength Range Around 2 µm Open
We investigated combining in the 2 µm wavelength range. Tapered fused bundles enabled multi-mode combining, while coupling of single-mode sources to a truly single mode fiber was performed employing cascades of wavelength division multiple…
View article: Gain dynamics in Raman fiber lasers and passive pump-to-Stokes RIN suppression
Gain dynamics in Raman fiber lasers and passive pump-to-Stokes RIN suppression Open
We report on theoretical and experimental investigations of gain dynamics in Raman fiber lasers in the frequency range of 1 Hz-1 MHz. An analytical solution of the problem is due to the nonlinear nature of the Raman effect not feasible. Th…
View article: Gain dynamics in Er^3+:Yb^3+ co-doped fiber amplifiers
Gain dynamics in Er^3+:Yb^3+ co-doped fiber amplifiers Open
Understanding the gain dynamics of fiber amplifiers is essential for the implementation and active stabilization of low noise amplifiers or for coherent beam combining schemes. The gain dynamics of purely Er3+ or Yb3+ doped fiber amplifier…
View article: The Wolf-Rayet stars WR102c and 102ka and their isolation
The Wolf-Rayet stars WR102c and 102ka and their isolation Open
While the majority of very massive stars is clearly found in clusters, there are also very massive objects not associated with any cluster, suggesting they may have been born in isolation. In order to gain more insights, we studied the reg…
View article: Fiber amplifiers at 1.5 [my]m for gravitational wave detectors : power scaling, gain dynamics, and pump sources
Fiber amplifiers at 1.5 [my]m for gravitational wave detectors : power scaling, gain dynamics, and pump sources Open
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View article: Information Security Risk Management in Higher Education Institutions: From Processes to Operationalization
Information Security Risk Management in Higher Education Institutions: From Processes to Operationalization Open
Information security has successfully gained high levels of management attention in European higher education institutions (HEIs) over the past decade, but is the data stored in HEI data centers, IT departments, or faculty server rooms rea…