| 摘要 |
PROBLEM TO BE SOLVED: To easily measure electric field modulation and time-resolved fluorescence spectra by dividing an irradiating beam into a plurality of beams having an optical path difference, alternately shutting off the respective beams, then again superposing them on the same axis, irradiating the sample with the beams, and applying a modulated field synchronized with a beam shut-off period to the sample. SOLUTION: A laser beam is split by a half-silvered mirror, and the beams are alternately shut off by using a chopper blade. When the upper (lower) beam is passed, the lower (upper) beam is shut off (passed). A period of the blade is normally about 10 to 100 Hz. Then, one of the split beams is lengthened from the other to make a time difference. The divided beams are again superposed on the same axis by using the half-silvered mirror, and the sample is irradiated with the beams. A modulated field synchronized with the chopper is applied to the sample. As the modulated field, in addition to an electric field, a magnetic field, a pressure or the like may be used. A fluorescence generated from the sample is wavelength-resolved through a spectroscope, and measured by a measuring instrument such as a stream camera or the like.
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