Phase Control of Attosecond Pulses in a Train

14 Jan 2019  ·  Guo Chen, Harth Anne, Carlström Stefanos, Cheng Yu-Chen, Mikaelsson Sara, Mårsell Erik, Heyl Christoph, Miranda Miguel, Gisselbrecht Mathieu, Gaarde Mette B., Schafer Kenneth J., Mikkelsen Anders, Mauritsson Johan, Arnold Cord L., L'Huillier Anne ·

Ultrafast processes in matter can be captured and even controlled by using sequences of few-cycle optical pulses, which need to be well characterized, both in amplitude and phase. The same degree of control has not yet been achieved for few-cycle extreme ultraviolet pulses generated by high-order harmonic generation in gases, with duration in the attosecond range... Here, we show that by varying the spectral phase and carrier-envelope phase (CEP) of a high-repetition rate laser, using dispersion in glass, we achieve a high degree of control of the relative phase and CEP between consecutive attosecond pulses. The experimental results are supported by a detailed theoretical analysis based upon the semiclassical three-step model for high-order harmonic generation. read more

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Atomic Physics