An Matroschka‐Puppen erinnernde Multieinschlussverbindungen wurden in unpolaren organischen Lösungsmitteln aus Kohlenstoff‐Nanoringen und einem C60‐Molekül hergestellt (siehe Bild). Eine Untersuchung dieser Strukturen zeigt, dass sich die elektronischen Eigenschaften planarer und gekrümmter konjugierter Systeme beträchtlich unterscheiden.

Passend gemacht: Kohlenstoffnanoringe wurden zur Komplexbildung mit Fullerenen (C60 und C70; siehe Bild) strukturell optimiert, wobei die Wirt‐Gast‐Affinität mit der Größe der Kontaktfläche korreliert. Die intensive Fluoreszenz des cyclischen Paraphenylenacetylen‐Wirtes wird durch Komplexbildung mit einem Fulleren gelöscht; der Effekt könnte als Grundlage zur Entwicklung eines Fullerensensors dienen.

Compact lasers capable of producing kilowatt class peak power are highly desirable for applications in various fields, including laser remote sensing, laser micromachining, and biomedical photonics. In this paper, we propose a high-peak-power chip-scale semiconductor/solid-state vertically integrated laser in which two cavities are optically coupled at the solid-state laser gain medium. The first cavity is for the intra-pumping of ytterbium-doped yttrium aluminum garnet (Yb:YAG) with an electrically driven indium gallium arsenide (InGaAs) quantum well, and the second cavity consists of Yb:YAG and chromium-doped yttrium aluminum garnet (Cr:YAG) for passive Q-switching. The proposed laser produces pulses as short as 450 ps, and an estimated peak power of 57.0 kW with a laser chip dimension of 1 mm3. To the best of our knowledge, this is the first monolithic integration of semiconductor and solid-state laser gain mediums to realize a compact high-peak-power laser.

The use of Q-switched erbium:yttrium-aluminum-garnet laser (Er:YAG laser), which have much less thermal effects than conventional Er:YAG lasers, has been proposed mainly in the medical field. The purpose of this study was to evaluate the bonding ability of dentin after Q-switched Er:YAG laser irradiation.The effects of dentin irradiation with Q-switched and conventional lasers were evaluated in terms of dentin morphology, roughness, hardness, elemental content, and resin bonding strength. Q-switched Er:YAG laser at average power densities of 20, 40, and 60 W/cm 2 and conventional Er:YAG laser at 909 W/cm 2 were used, and their performance was compared with that of the untreated group. Significant differences (p<0.05) were observed between 20 W/cm 2 and the other groups in term of surface roughness and surface hardness. The resin adhesion of the 20 W/cm 2 group was significantly higher than that of the other groups (p<0.05).