Patent attributes
There is provided a chirp indicator of ultrashort optical pulse in which a target ultrashort optical pulse is introduced into a spatial filter formed of a hologram in which is recorded information of chirp quantity of an ultrashort optical pulse used as a reference. The chirp indicator identifies the chirp quantity of the ultrashort optical pulse by detecting an optical correlation between the target ultrashort optical pulse and the ultrashort optical pulse used as a reference. Here, the ultrashort optical pulse to be detected is detected for each hologram, and depending on intensity of an amplitude of light emitted from each hologram, a composition ratio of chirp quantity corresponding to each hologram is deteremined. Then, based on the determined mixture ratio of the chirp quantity, chirp quantity of the ultrashort optical pulse to be detected is determined.
