DETECTOR AND DEVICE EVALUATOR

摘要

PROBLEM TO BE SOLVED: To provide a means which enables diagnosis to determine where a failure occurs in a device or the observation of how the propagation, coupling and switching of optical signals are done by watching how the propagation of the optical signals is done in the device in real time. SOLUTION: An electrical signal or an optical pulse input is arranged to start the operation of a device and a probe pulse optical input is so arranged as to have a variable time delay with respect thereto. This achieves a detection of a spatial distribution of photoelectrons released from the surface of the device.