Harold Foppele

Energy without rest mass: photons, binding, and the accounting of energy in modern physics

The formula E=mc² is often read as a complete definition of energy, which makes it puzzling that light, with zero rest mass, can heat matter, push a mirror, eject electrons and add to the mass of a black hole. This article separates rest energy, total energy and transported energ...

Ultrafast Lasers: from Femtosecond to Rontosecond Pulses

A review article on ultrashort laser pulses across eleven orders of magnitude in time. It covers femtosecond lasers (Kerr-lens mode-locking, chirped pulse amplification), attosecond pulse generation by high harmonic generation and the 2023 Nobel Prize, zeptosecond measurements (i...

Editing with agents: five months of building a scholarly physics wiki with three AI systems under one human editor

ScholarlyWiki is a MediaWiki-based reference work that publishes physics literature as structured, navigable pages: full texts with numbered equations, figures with provenance, and DOI-linked references, organised into books and author series. Between 8 May and 7 October 2026 the...