| 摘要 |
A low-cost wide-band light detection system is disclosed using a light conducting member which is a long dielectric waveguide having a phototransistor at a far end. The waveguide or light conducting member is designed to have a specified leakage rate with one side of the guide being perfectly reflecting and the other side being only partially reflecting. The output of the phototransistor or other photodetector is dependent upon the intensity and position of the beam which strikes an incident zone of the photodetection device. The photodetection device may function as a laser power monitor, while advantageously allowing most of the laser power to be used for an experiment or other purpose. Additionally, the device may be used as a position sensitive detector (PSD). By using one of the devices as a power monitor and another of the devices as a PSD in the same experiment, one can determine the motion or displacement of an object under test independent of instability in the laser or other source of light.
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