研究目的
Investigating the feasibility and effectiveness of ultrafast ghost imaging in the time-domain with wavelength conversion for applications in spectral regions lacking fast detectors.
研究成果
The experimental results demonstrate that correlation information is preserved and transferred during the wavelength conversion process, enabling ultrafast imaging in spectral regions where fast detectors are not available, such as the mid-infrared and THz range.
研究不足
The technique's resolution is limited by the characteristic length scale of the probing patterns fluctuations and the resolution with which they can be measured. The applicability is currently demonstrated in controlled laboratory conditions.
1：Experimental Design and Method Selection:
The experiment utilizes a ghost imaging technique with wavelength conversion to measure ultrafast signals. The setup involves a quasi-continuous wave laser at 2 μm, a fast electro-optic modulator, and a nonlinear BBO crystal for frequency doubling.
2：Sample Selection and Data Sources:
The temporal object is a bit sequence produced by a fast electro-optic modulator. The random intensity fluctuations from the laser are used as probing patterns.
3：List of Experimental Equipment and Materials:
Includes a quasi-continuous wave laser, electro-optic modulator, BBO crystal, slow integrating detector, fast avalanche photodiode, and various optical components.
4：Experimental Procedures and Operational Workflow:
The laser illuminates the temporal object, and the transmitted light is detected. The random intensity fluctuations are frequency-doubled and measured in real time. The correlation between the integrated signal and the fluctuations retrieves the bit pattern sequence.
5：Data Analysis Methods:
The correlation between the integrated signal and the random intensity fluctuations is analyzed to reconstruct the temporal object.
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