Patent ID: 11913836
Assignee: HAMAMATSU PHOTONICS K.K.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G

Claim 7:
8. A dispersion measurement method comprising:
performing a pulse forming of forming a light pulse train including a plurality of second light pulses having time differences and center wavelengths different from each other from a first light pulse output from a light source;
performing an optical branching of branching the light pulse train passed through a measurement object into a first light pulse train and a second light pulse train;
performing an imaging of dispersing and imaging the first light pulse train branched by the optical branching, and generating imaging data for each second light pulse included in the first light pulse train;
performing a spatial filter of extracting light of one or a plurality of partial regions in a cross section intersecting with a traveling direction of the second light pulse train branched by the optical branching;
performing a correlation light generation of generating correlation light including a cross-correlation or an autocorrelation of the light of the one or plurality of partial regions;
performing a photodetection of detecting a temporal waveform of the correlation light; and
performing an operation of estimating a wavelength dispersion amount in the measurement object based on a feature value of the temporal waveform, wherein
the pulse forming, the optical branching, the imaging, the spatial filter, the correlation light generation, the photodetection, and the operation are repeatedly performed while changing a spatial position of the partial region in the cross section.