| 摘要 |
A light pulse from an ultrashort pulse light source 11 is split by a beam splitter 12 and guided, to a detection medium 4 , as an excitation pulse and probe pulse having respective predetermined linearly polarized states by an excitation optical system 2 and probe optical system 3 , respectively. A light track region which is generated in the detection medium 4 by incidence of the excitation pulse, and in which the refractive index is changed by a nonlinear optical effect, is irradiated with the probe pulse. Of components which have passed through the detection medium 4 , a probe pulse component whose polarized state has changed through the light track region is detected by a camera 53 via an analyzer 51 in a photodetection part 5 . This realizes a light track observation apparatus capable of directly observing the light track of an excitation pulse.
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