Quadric hologram-based self-conjugation of vortex beams

Self-conjugation of singular (vortex) beams by a static nonlinearly recorded hologram is reported. Diagnostics of phase-conjugated vortices is implemented using an original technique based on Young’s model of diffraction phenomena. It has been shown that the phase-conjugated vortex is characterized by the same topological charge as the vortex reversed through four-wave degenerate mixing being different in sign from the vortex reflected by a common mirror

Hoveyda–Grubbs catalysts with an N→Ru coordinate bond in a six-membered ring. Synthesis of stable, industrially scalable, highly efficient ruthenium metathesis catalysts and 2-vinylbenzylamine ligands as their precursors

A novel and efficient approach to the synthesis of 2-vinylbenzylamines is reported. This involves obtaining 2-vinylbenzylamine ligands from tetrahydroisoquinoline by alkylation and reduction followed by the Hofmann cleavage. The resultant 2-vinylbenzyl-amines allowed us to obtain new Hoveyda–Grubbs catalysts, which were thoroughly characterised by NMR, ESIMS, and X-ray crystallography. The utility of this chemistry is further demonstrated by the tests of the novel catalysts (up to 10 −2 mol %) in different metathesis reactions such as cross metathesis (CM), ring-closing metathesis (RCM) and ring-opening cross metathesis (ROCM). © 2019 Polyanskii et al

Visualization 1: Influence of evanescent wave on birefringent microplates

Visualization 1 Originally published in Optics Express on 06 February 2017 (oe-25-3-2299

Visualization 2: Influence of evanescent wave on birefringent microplates

Visualization 2 Originally published in Optics Express on 06 February 2017 (oe-25-3-2299

Visualization 4: Influence of evanescent wave on birefringent microplates

Visualization 4 Originally published in Optics Express on 06 February 2017 (oe-25-3-2299