Increased phase-matching bandwidth in GRENOUILLE measurements

Summary form only given. As ultrashort pulses have become broader in bandwidth, shorter in time, and more complicated, techniques for measuring them have kept pace, becoming more reliable, more sensitive, and simpler to build and use. While previously the simplest, reliable, intensity-and-phase measurement technique available was FROG (Trebino et al, 1997), the recent development of the GRENOUILLE pulse-measurement device has made pulse measurement even simpler, while building upon the same foundations that make FROG so reliable. This paper shows how a simple dithering of the lateral beam position can generate a sufficient range of angles to achieve phase-matching without measurement trade-offs. Furthermore, such a change can be made to existing GRENOUILLE setups without the need to change the existing optics.