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Tailored micro-optical freeform holograms for integrated complex beam shaping

Sediment budgeting of short-term backfilling processes – the erosional collapse of a Carolingian canal construction

Sediment budgeting concepts serve as quantification tool to decipher the erosion and accumulation processes within a catchment and help to understand these relocation processes through time. While sediment...

Polarization-Dependent Vibrational Shifts on Dielectric Substrates

The interaction of light with matter at surfaces of dielectrics strongly depends on polarization. Here, we present the first infrared spectroscopic evidence for significant polarization effects in the...

Regenerated Fibre Bragg Gratings: A Critical Assessment of more than 20 Years of Investigations

Regenerated fibre Bragg gratings are formed when specially pre-treated seed gratings are heated up to several hundred degrees centigrade. During this process, the fibre Bragg grating (FBG) reflectivity...

Characterization and calibration of shape sensors based on multicore optical fibre

In order to provide high accuracy in shape measurement with multicore optical fibres, characterization and calibration procedures are an important part of sensor preparation. Some procedures can be considered...

Towards Bacteria Counting in DI Water of Several Microliters or Growing Suspension Using Impedance Biochips

We counted bacterial cells of E. coli strain K12 in several-microliter DI water or in several-microliter PBS in the low optical density (OD) range (OD = 0.05–1.08) in contact with the surface of Si-based...

Influence of pedestral diameter on mode instabilities in Yb/Ce/Al-doped fibers

In this paper we present numerical and experimental results revealing that the mode instability threshold of highly Yb-doped, Ce/Al co-doped pedestal fibers is affected by the size of the index-increased...

Background Reduction in STED-FCS Using a Bivortex Phase Mask

Fluorescence correlation spectroscopy (FCS) is a valuable tool to study the molecular dynamics in living cells. When used together with a super-resolution stimulated emission depletion (STED) microscope,...

792 or 793? Charlemagne’s canal project: craft, nature and memory

In autumn 793, Charlemagne visited the fossatum magnum (the ‘big ditch’ or canal) between the Rhine and Danube. Excavations, dendrochronology and a re-reading of Carolingian Annals shed new light on...

Superconducting Sensors and Methods in Geophysical Applications

More than 50 years ago superconducting quantum interference devices (SQUIDs) were invented. Since then many applications opened up. Already in a 1980 workshop (Weinstock and Overton 1981 SQUID Applications...