5 research outputs found
Absolute Frequency Measurement of Rubidium 5S-7S Two-Photon Transitions
We report the absolute frequency measurements of rubidium 5S-7S two-photon
transitions with a cw laser digitally locked to an atomic transition and
referenced to an optical frequency comb. The narrow, two-photon transition,
5S-7S (760 nm) insensitive to first order in a magnetic field, is a promising
candidate for frequency reference. The performed tests yield the transition
frequency with accuracy better than reported previously.Comment: This paper was published in Optics Letters and is made available as
an electronic reprint with the permission of OSA. The paper can be found at
http://dx.doi.org/10.1364/OL.38.004581. Systematic or multiple reproduction
or distribution to multiple locations via electronic or other means is
prohibited and is subject to penalties under la
Effect of extrusion process and various elongation ratios on the structural and dielectric properties of pvdf-based copolymer containing micro and nano-sized crystallites
In this contribution, the effect of the extrusion process of the poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-co-HFP) with the subsequent elongation/poling on its structural and dielectric properties is presented. The extrusion can be understood as continuous processing of polymer melts in the large scale (in comparison to solvent casting), when the thickness of the final product can be varied depending on the final operation conditions. Herein, the PVDF-co-HFP sheets of 5 cm in width were extruded using a single screw extruder. The fabricated sheets were cooled down and then, they were cut to the stripes and subsequently stretched to various elongations (100, 200 and 500 %) using a universal tensile testing machine. Such samples were investigated using FTIR in order to determine the effect of the elongation process on the transformation of the a-phase to the β-crystalline phase. The extend of the electro-active β-phase was quantified and its impact on the dielectric properties was investigated. The results clearly demonstrated that the elongation has a crucial effect on the final dielectric properties of the PVDF-co-HFP. © 2021 TANGER Ltd., Ostrava.Czech Science FoundationGrant Agency of the Czech Republic [19-17457S]; Ministry of Education, Youth and Sports of the Czech Republic DKRVO [RP/CPS/2020/003, RP/CPS/2020/006]RP/CPS/2020/003, RP/CPS/2020/006; Ministerstvo Ĺ kolstvĂ, MládeĹľe a TÄ›lovĂ˝chovy, MĹ MT; Grantová Agentura ÄŚeskĂ© Republiky, GA ÄŚR: 19-17457