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High-precision time-interval measurement is a fundamental technique in manyadvanced applications, including time and distance metrology, particle physics,and ultra-precision machining. However, many of these applications are confinedby the imprecise time-interval measurement of electrical signals, restrictingthe performance of the ultimate system to a few picoseconds, which limitsultra-high-precision applications. Here, we demonstrate an optical means of thetime-interval measurement of electrical signals that can successfully achievefemtosecond (fs)-level precision. The setup is established using theoptical-frequency-comb (OFC)-based linear optical sampling technique to realizetimescale-stretched measurement. We achieve the measurement precision of 82 fsfor a single LOS scan measurement and 3.05 fs for the 100-times average withpost-processing, which is three orders of magnitude higher than the results ofolder electrical methods. The high-precision time interval measurement ofelectrical signals can substantially improve precision measurementtechnologies.

Time-interval Measurement with Linear Optical Sampling at the Femtosecond Level