A stimulated Raman scattering microscope device is configured to irradiates a sample with a first optical pulse at a first repetition frequency, to irradiate the sample with a second optical pulse of an optical frequency different from an optical frequency of the first optical pulse at a second repetition frequency, and to detect optical pulses of the first repetition frequency that are included in detected light from the sample irradiated with the first optical pulse and the second optical pulse, as a detected optical pulse train. The second optical pulse is generated by dispersing predetermined optical pulses that include lights of a plurality of optical frequencies, regulating to output optical pulses of a predetermined number of different optical frequencies out of the dispersed optical pulses at the second repetition frequency, and coupling the regulated optical pulses.
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