Measurement of Long-Pulse Fine Structure by Time-Spectrum Coding

We propose and numerically simulate a time-spectrum coding method to measure the fine structure of long pulses. By a difference-frequency (DF) interaction between the pending-measured long pulse and a linearly chirped pulse, the spectrum of the generated DF pulse contains the intensity information of the pending-measured pulse and the frequency information of the linearly chirped pulse. The numerical simulation results show that the fine structure of the pending-measured pulse can be derived from the spectra of the DF pulse and the linearly chirped pulse.