Optical probe based on double-clad optical fiber
Wereportanopticalprobebasedonasingledouble-cladfiber(DCF),whichissuitableforfluorescencespectroscopy.TheexcitationlightisdeliveredthroughthesmalldiametercoreoftheDCFandtheexcitedfluorescencelightiscollectedbythelargediameterinnercladdingofthesamefiber.Toretrievethesignalbeamfromt