Time-space conversion for short pulse generation with a long lifetime phosphor

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An optical system was designed and fabricated to achieve signal wavelength conversion. Although a rare-earth doped phosphor was useful to achieve the infrared-to-visible conversion, its long-lasting phosphorescence prevented high-frequency modulation. This problem was solved by using a time-space conversion method, in which a phosphorescent disk was rotated to attain the fast-response wavelength conversion. When an infrared pulse train with 500-ns duration and 1-MHz repetition rate was focused on the rotating disk, phosphorescent dots were created along the disk periphery. By detecting the phosphorescence at a downstream position of the dot trajectory, a visible signal of 1 MHz was observed.

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