Displacement measurement using time-stretch microwave photonics with picosecond laser pulses

Analyzing data and measuring microwave frequency and displacement with ultrafast lasers can be resourceintensive due to the substantial amount of data. As seen in current advanced techniques, achieving high resolution in both frequency and displacement necessitates using femtosecond or frequency comb lasers along with high-speed photodetectors. In this report, we designed a displacement measurement system using a picosecond laser source and an optical heterodyne detection transduction using dispersive elements to measure instantaneous frequency and displacement. A 140 MHz frequency resolution and a 1.02 MHz freuency precision corresponding to 3.56 mu m displacement precision is achieved in measuring the instantaneous frequency of the interference signal, and consequently, the displacement of a mirror.