Henrik Koblitz Rasmussen

TL;DR: Near-field, frequency-resolved characterization with high spatial resolution of the amplitude and phase of the modal structure proves that the fiber is single-moded over a wide frequency range, and the authors see the onset of higher-order modes at high frequencies as well as indication of microporous guiding at low frequencies and high porosity of the fiber.

TL;DR: Characterization of the FBGs shows that the TOPAS FBG is more than 50 times less sensitive to humidity than the conventional PMMA FBG in both wavelength regimes, which makes the TOPas FBG very appealing for sensing applications as it appears to solve the humidity sensitivity problem suffered by the PMMAFBG.

TL;DR: In this article, the authors measured transient and steady elongational viscosity for two narrow molar mass distribution polystyrene melts of molar masses 200 000 and 390‰000 by means of a filament stretching rheometer.

TL;DR: The fabrication and characterization of fiber Bragg gratings in an endlessly single-mode microstructured polymer optical fiber (mPOF) made of humidity-insensitive high-Tg TOPAS cyclic olefin copolymer is presented.

TL;DR: In this paper, a filament stretching rheometer has been constructed to measure the elongational viscosity of polymer melts at high temperatures, and a constant elongational rate has been obtained by an iterative application of the Orr-Sridhar method for specification of the endplate movement.