Numerical Simulations of an Ultrasimple Ultrashort-Laser-Pulse Measurement Device-GRENOUILLE

We numerically simulate the performance of the grating-eliminated no-nonsence observation of ultrafast incident laser light E-fields (GRENOUILLE) device, an experimentally very simple variation of frequency-resolved optical gating (FROG) for measuring ultrashort laser pulses. GRENOUILLE has many subtleties because it uses the second-order nonlinearities of a thick nonlinear-optical crystal with relatively tightly focused and broadband pulses, in which the phase-matching bandwidth is deliberately made narrow compared to the pulse bandwidth. In the current study, we compute the nonlinear-optical signal field in the frequency domain and considered all sum-frequency-generation processes, both collinear and noncollinear. We compute the GRENOUILLE trace for practical examples and show that accurate measurements are easily obtained for properly designed devices