ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
A small head-on photomultiplier (HR2247) with "half photocathode gating'' is being used for detection in a superheterodyne mixing scheme. The HR2247 has a spectral range of 160–650 nm, a frequency response to 1 GHz and is inexpensive. A gate mesh covers part of the photocathode surface. Internal mixing is accomplished by applying a rf signal to the gate mesh. A fiber-optic/objective assembly mounted on an X-Y stage scans the position of the incident laser beam on the mesh. In order to evaluate the suitability of the HR2247 for practical fluorescence and imaging experiments, the photocathode surface was mapped at 41, 205, 410, 615, and 820 MHz modulation frequencies for variations in phase and modulation. The mixed signal at any point on the gate mesh can be optimized by adjusting the potential at the gate mesh.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1144349
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