Different diagnostics techniques employ to characterize the femtosecond laser systems such as auto-correlation, frequency resolved optical gating (FROG), and cross-correlation frequency resolved optical gating (XFROG). Other complex techniques like spectral phase interferometry for direct electric-field reconstruction (SPIDER) and dispersing a pair of light electric fields (TADPOLE) which is the combination of FROG and SPIDER. The autocorrelation technique fails to provide information about the phase of the pulse. Therefore, the shape of temporal profile guessed before to make the experimental measurements. On the other hand, SPIDER technique can provide spectral and temporal information, but the experimental setup is quite complicated and challenging in the alignment. The FROG technique, which can be described as a spectrally resolved auto-correlation measurement, simple in setup and efficient to characterize the spectral and temporal evolution of the femtosecond pulses. There are different versions of FROG diagnostic techniques; the most sensitive version of FROG is second harmonic generation (SHG) FROG. Further, it can be a categorized into multi-shot FROG and single-shot FROG. The FROG techniques involve the gating of pulse with itself and measured the spectrum versus the delay between the two pulses, while in the XFROG technique a well-known pulse is gated with the unknown measured pulse. The XFROG and FROG techniques gives the phase and pulse intensity versus time or frequency domain.