The Uninvited Photon: Controlling Stray Light in High-Performance Optical Systems
In precision optical instruments, the photons that arrive where they are not supposed to can be just as consequential as those that do not arrive at all. Stray light—unwanted radiation that bypasses the intended optical path and contaminates the detector—quietly degrades spectrometers, telescopes, and biomedical imagers alike, often without obvious symptoms. A new generation of detection methods, ultra-absorbing coatings, and rigorous baffle engineering is changing how instrument designers confr