Patent ID: 8912508

Claim:
A multiphoton-excited measuring device measuring a biological sample with the use of a multiphoton absorption phenomenon by optical pulses having high intensity, comprising a short pulse light source emitting optical pulses, a repetition rate of which is variable; an irradiation optical system irradiating a sample with optical pulses emitted from the short pulse light source; a detector detecting signal light generated, in association with multiphoton excitation, from the sample by the irradiation with optical pulses; and an optical pulse compression unit being disposed between the short pulse light source and the irradiation optical system and including an optical fiber solely constituted by a single-mode optical fiber transmitting optical pulses emitted from the short pulse light source with anomalous dispersion in a wavelength to compress a pulse width, with the use of nonlinear effects causing intensity-dependent spectral variation of the optical fiber, so that a pulse width of optical pulses with which the sample is to be irradiated is shortened to equal to or narrower than that of optical pulses emitted from the short pulse light source and so that a spectral width of optical pulses with which the sample is to be irradiated is broader than that of optical pulses emitted from the short pulse light source.