Optical device for light detector

摘要

This invention relates to an optical device ( 1 ) including a cavity ( 2 ) for which at least part is ellipsoidal with a first focus (F₁) and a second focus (F₂), the device including means of presenting a medium containing components to be analysed in the cavity at the first focus, the device also including means of transporting an excitation light beam in the cavity along a path also passing through the first focus (F₁) to illuminate the medium at the first focus. The ellipsoidal part of the cavity includes a wall reflecting light emitted by the medium in response to the excitation light beam, the device including means ( 5 ) of collecting said emitted light at the second focus (F₂).