Systematic studies of the temporal coherence properties of high-order harmonic radiation are presented. These complement our previous investigations [Bellini et al., Phys. Rev. Lett. 81, 297 (1998)], where we showed the separation of the far-field pattern of high-order harmonics into two distinct spatial regions with different coherence times. Here we show how the coherence time of the inner and outer regions changes as a function of the harmonic order, the laser intensity, and the focusing conditions. Good agreement with the predictions of the semiclassical model of harmonic generation is obtained. © 1999 The American Physical Society.
Publication Source (Journal or Book title)
Physical Review A - Atomic, Molecular, and Optical Physics
Lyngå, C., Gaarde, M., Delfin, C., Bellini, M., Hänsch, T., L’ Huillier, A., & Wahlström, C. (1999). Temporal coherence of high-order harmonics. Physical Review A - Atomic, Molecular, and Optical Physics, 60 (6), 4823-4830. https://doi.org/10.1103/PhysRevA.60.4823