Ingemar Petermann

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We present a novel scheme based on sequential writing for fabrication of advanced fiber Bragg gratings. As opposed to earlier sequential methods this technique uses a cw UV laser source and allows for very precise control and repetitivity of the formation of the gratings. Furthermore it is possible to use high average irradiances without destroying the(More)
The blue OLED emission from a mobile phone was characterised, revealing a sharp emission band centred at λ = 445 nm with a 3dB bandwidth Δλ ∼ 20 nm. It was used to excite Rhodamine 123 doped within a "giant" mesostructured silica sphere during fabrication through evaporative self-assembly of silica nanoparticles. Fluorescence was able to be detected using a(More)
The erosion of shell gaps due to nucleonic excitations is one of the most interesting facets of modern nuclear structure. While most of the research has been concentrated on neutronrich nuclei, examples for cross-shell correlations are also known close to double-magic nuclei. For example, the M1 strength distribution for Ar, a nucleus with two proton holes(More)
We constructed a type of sensor by depositing a solgel layer within the interior holes of a silica-structured fiber and, subsequently, coating this with an acid-responsive porphyrin. Protonation of the porphyrin by an acidic gas (HCl in this case), is detected by a large change in the visible spectrum. Compared to previous work on a liquid-core sensor in a(More)
About half of the elements heavier than mass number A ∼ 60 are made within the r-process, a sequence of rapid neutron captures and β decays [1]. The r process occurs in environments with extremely high neutron densities. Then neutron captures are much faster than the competing decays. Hence the r-process path runs through such extremely neutron-rich nuclei(More)
The SU(4) symmetry is known to be a reasonable concept for p-shell nuclei and is recognizable in sd-shell nuclei. In heavy nuclei it is strongly broken. However, as pointed in [1], the breaking of SU(4) symmetry may be exaggerated in nuclear models which do not consider all, but only certain correlations, e.g. HFB-type and IBM models that only include(More)
Different sources of stitch errors are identified and simulated in a 200 mm long chirped grating. In each case, the effect on the group-delay ripple and transmission spectrum is investigated. The anticipated response in a typical 10 Gbit/s transmission system is specifically considered. From the simulations, it is clear that information about error source(More)
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