SPECTRUM MEASUREMENT METHOD, SPECTRUM MEASUREMENT DEVICE, AND BROADBAND PULSE LIGHT SOURCE UNIT

摘要

[Problem] To provide a novel spectrum measurement feature with which it is possible to perform measurements even when light to be measured is present for only a very short time. [Solution] Light to be measured L0 is caused to interfere with broadband pulse light L1 in which the wavelength continuously changes over time within a pulse, and an output signal of a detector 5 that has detected the resulting interference light is subjected to Fourier transformation, whereby the optical intensity for each wavelength of the light to be measured L0 is obtained. The broadband pulse light L1 is generated by making laser light L2 from a laser light source 1 into supercontinuum light L3 by a non-linear optical element 2 and subjecting the same to pulse expansion by a pulse expansion element 3.