Enhanced photomultiplier sensitivity in spectroscopy systems.
A fiber-ribbon-based coupling method is presented as a practical way to enhance light sensitivity in spectroscopic and similar systems employing a multialkali photomultiplier tube as a detector. The sensitivity enhancement is achieved by an increase in absorption in the photocathode through multiple total internal reflection in the photomultiplier entrance window. Improvements by factors of approximately 2 (blue-green) to more than 10 (near infrared) have been measured. Implications for spectroscopic applications are discussed.
Hallensleben
S
S
School of Engineering and Information Technology, Pevensey Building, University of Sussex, Brighton BN1 9QH, UK.
Townsend
P D
PD