January 2020 Issue
Feature Articles
Engineering with Bound States in the Continuum
Identified nearly a century ago by early workers in quantum mechanics, bound states can dramatically reduce radiation from optical resonators, opening up new application prospects in nanophotonics.
by Kirill Koshelev, Andrey Bogdanov and Yuri KivsharThe Most Important Paper You’ve Never Read
A half-century ago, a seminal but largely forgotten study identified the “coherent artifact” in measurements of ultrashort laser pulses.
by Rick TrebinoDepartments and Columns
With up to 10 petawatts of peak laser power, the EU's three ELI facilities include the most powerful lasers to date (see this month's cover story ELI: Open for Business). A planned fourth ELI pillar and a few other high-intesity laser projects could boost peak power even further, reaching the exawatt scale.
High Brightness in ELI’s Shadow
Co-chairs of the High-brightness Sources and Light-driven Interactions Congress discuss the broad and diverse range of invited talks coming to Prague.
Where Optics and Photonics Are Made
OSA’s senior industry adviser maps out the current landscape of optics manufacturing, and offers insights into how production locations may shift.
Holography's Unexpected Origins
Born of a desire to improve the resolution of electron microscopy, holography quickly grew into an exciting field in optics in its own right with the invention of the laser.
Also in this Issue
30, 20, and 10 Years Ago in OPN
Video workstations; spectroscopic OCT; Raman fiber laser
New roles for Whaley and MacFarlane / Honors for Baets and Pagonis / OSA CEO makes case for science funding / EC Biophotonics Standardization meeting / ACP 2019 / Industrial Affiliates Days / OSA Fellow stories / Thank you, editors and volunteers

![Manual probe system with needles for test of semiconductor on silicon wafer. [A. Morozov / Getty]](https://opnmedia.blob.core.windows.net/$web/opn/media/images/articles/2025/1125/departments/202511-cover-web.jpg?ext=.jpg)
![Researcher Clara Saraceno in the lab. [Image by Carsten Behler Photography]](https://opnmedia.blob.core.windows.net/$web/opn/media/images/articles/2025/1025/departments/202510-cover-web.jpg?ext=.jpg)