October 2019 Issue
Feature Articles
Ultraviolet, the Vampire Slayer
OPN’s “Light Touch” columnist offers a Halloween treat: a brief cultural history of UV light’s deadly effect on vampires.
by Stephen R. WilkDepartments and Columns
A New Lens on Agricultural Monitoring
An agri-tech startup aims to increase the quality and efficiency of food-process monitoring in the rural United States.
Determining Molecular Vibrations
Nearly a century ago, the discovery of the inelastic scattering of light gave birth to Raman spectroscopy, enabling fundamental scientific insights at the molecular level.
Pursuing an Entrepreneurial Vision
Three professionals explain why starting an optics and photonics business is a viable and fulfilling career track.
Also in this Issue
30, 20, and 10 Years Ago in OPN
Surface-emitting diode lasers; quantum cascade lasers; lidar.
Honors for Strickland and Marcos / First Subsea-optical-fiber School / Congressional Fellows / OSAF hosts Innovation School / OSA Fellow Stories / Reviewer Portal Launched / Fourth Edition of ISLIST / 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)