September 2021 Issue
Feature Articles
Synchrotron Light Sources for the 21st Century
Labs on five continents are upgrading their storage-ring synchrotrons and free-electron lasers to make their X-ray beams brighter and more adaptable to scientific and medical applications.
by Patricia DaukantasThe Search for a Better COVID Test
Researchers are drawing on optics and photonics to improve the current “gold-standard” approach to coronavirus diagnostics—and to develop promising alternatives.
by Stewart WillsDepartments and Columns
Next month, the Nobel Prizes for 2021 will be announced. Here we look at women who have received the Nobel Prize in physics, chemistry and physiology or medicine. For a closer look at recent advances in optics based on the 2020 Chemistry Nobel winners’ research, see this month’s cover story.
Also in this Issue
30, 20, and 10 Years Ago in OPN
Jean Bennett; nanowire nanolasers; green laser diodes.
A cutting-edge OFC 2021 / Carney appointed OSA chief scientist / 5G Summit / OSA Foundation prize winners / Treasuer’s Award winners / Société Française d’Optique Congress / Congressional Fellows / OSA Fellow stories / Thank you, editors and volunteers
Summary of OSA financial statements from the past year.

![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)