Wavelength Corrected Ultrafast Pulse Characterization Using Frequency Resolved Optical Gating

Frequency Resolved Optical Gating (FROG) has been used extensively for ultrafast pulse characterization. While the reconstructed electric field can be uniquely determined from the FROG trace, there is no real time calibration of wavelength dependent nonlinearity that affects the FROG trace in the reconstruction algorithm. This modifies the measured FROG trace which ultimately affects the reconstructed electric field. In this paper, we proposed an extension to the FROG setup through an optical spectrum analyser (OSA) for real time calibration. Through the addition of an OSA, the nonlinearity can be compensated to get the original FROG trace which allows for the accurate reconstruction of the ultrafast pulse.