Observation of the beat between two independent light sources by a method of time-delayed laser-induced double gratings.
A novel method of time-delayed laser-induced double gratings has been proposed to study the beat between two independent light sources. Our experimental results indicate that we can obtain good interference patterns even when the coherence time of the laser source is only a few picoseconds. This new technique can be used to measure the frequency difference between two laser fields.
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Mi
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Jiang
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Yu
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Fu