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Full-field ultrafast oscilloscope based on temporal imaging.
Optics Express 2019 March 5
As the ultrafast laser has been developed, the measurement of ultra-speed transient and dynamic processes has gained much attention. An ultrafast oscilloscope based on the optical stretch method is promising to address this problem, but the measurement is restricted to the temporal profile. This means that the temporal phase is lost. In this work, we propose a full-field ultrafast oscilloscope using two temporal phase retrieval methods: the temporal annealing Gerchberg-Saxton (TAGS) algorithm and temporal ptychography. These could provide complete information, including temporal profile and phase, of high-rate repetitive transient pulses. The functions of an ultrafast oscilloscope with 230 GHz bandwidth and the two phase retrieval methods are verified by simulation and experimental results. This full-field ultrafast oscilloscope promises more applications in phase encoding, phase-contrast imaging, and sensing in the time domain.
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