Lindner, F., Paulus, G. G., Walther, H., Baltuska, A., Goulielmakis, E., Lezius, M., & Krausz, F. (2004). Gouy phase shift for few-cycle laser pulses. Physical Review Letters, 92, 113001-1-113001–113004. https://doi.org/10.1103/PhysRevLett.92.113001
We measured for the first time the influence of the Gouy effect on focused few-cycle laser pulses. The carrier-envelope phase is shown to undergo a smooth variation over a few Rayleigh distances. This result is of critical importance for any application of ultrashort laser pulses, including high-harmonic and attosecond pulse generation, as well as phase-dependent effects.
