A new multifunctional device for femtosecond pulse characterization with a wide operating range

We demonstrate a novel and simple device for femtosecond pulse characterization, which combines the frequency-resolved optical gating (FROG) and the self-referenced spectral interferometry (SRSI) methods in the frequency-resolved optical gating and self-referenced spectral interferometry (FASI) method. It was found that the comparative advantages of FROG and SRSI can complement each other. Therefore FASI can be used to characterize femtosecond pulses in different conditions, which may need different devices when using either the FROG or the SRSI method independently. With our multifunctional FASI device, the TG-FROG, SHG-FROG and TG-SRSI methods were used to fully characterize femtosecond pulses at 800 nm with different dispersions. The experimental results obtained by all three methods were compared with each other and also with the calculated data. These results proved the reliability and the wide operating range of our FASI device.