Light intensity correlating apparatus.

摘要

An apparatus for measuring an autocorrelation waveform of the intensity of an input light beam comprises a beam splitting means (40) for dividing the input light beam into two light beams, a photoelectric converter (42) for converting one of the divided beams into an electrical signal, an optical modulating means (44) for modulating the other light beam in accordance with the electrical signal, a delay means (46) for varying a relative delay between the arrival times at the optical modulating means of the light beam and the electrical signal, and a photodetector (48) having a response speed faster than that of the delay time variation for detecting an output light beam from the optical modulating means (44).