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Frequency tripling mirrors offer a promising alternative to complicated cas- caded arrangements for third harmonic generation. By incorporating optimised dielectric layers, we have achieved a remarkable conversion efficiency of 3.5 %. We will give a deep insight into FTMs and discuss applications. © 2024 The Author(s)

Starting from C6H4(PCl2)2 and the TMS‐substituted ylide (TMS)2C=PR3 (TMS=trimethylsilyl, R=p‐tolyl), the phosphonium‐substituted diphosphaindenylide PPI was prepared in two steps. CASSCF calculations as well as the reactivity toward diphenyl acetylene suggest a notable biradical character in PPI. Reaction with [Cr(CO)3(MeCN)3] affords the complex [Cr(CO)3(η5‐PPI)] (5). This complex was employed to explore the ligand properties of PPI, which demonstrates considerable potential through the combination of strong metal‐ligand interactions and the possibility of a pronounced indenyl effect. [ABSTRACT FROM AUTHOR]

We present novel waveguide writing concepts in bulk PMMA. The writing relies on laser induced modification tracks that are completely surrounding a waveguide core. We found the optimal parameters to construct highly reproducible, single-mode waveguides with minimal propagation losses down to 0.6 dB  cm−1. Employing the best geometry, we demonstrate 2D and 3D Y-splitters that are the building blocks for creating complex optical networks such as sensors or lab-on-chip devices in polymer materials. [ABSTRACT FROM AUTHOR]

This article, titled "Phosphonium-substituted Diphosphaindenylide (PPI): Exploration of Biradical Character and Ligand Properties," discusses a complex bonding scenario found in a biradicaloid chromium complex. The article uses a metaphor of doors and a staircase to illustrate the bonding interactions between the ligand and the metal. The electrons flow in both directions, from the ligand to the metal and vice versa. The article provides more information on this topic and is authored by Peter Coburger, David Zuber, Clara Schweinzer, and Moritz Scharnhölz. [Extracted from the article]