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    Area of Science:

    • Quantum Optics
    • Attosecond Science
    • Ultrafast Lasers

    Background:

    • High harmonic generation (HHG) produces coherent radiation bursts.
    • Ultrafast wavefront rotation enables precise control of light pulses.

    Purpose of the Study:

    • To develop an 'attosecond lighthouse' generating spatially separated attosecond pulses.
    • To enhance the temporal separation and contrast of attosecond pulses.

    Main Methods:

    • Combining high harmonic generation with ultrafast wavefront rotation.
    • Introducing a coherent second harmonic beam with parallel polarization.
    • Scanning the carrier envelope phase (CEP) of the driving field.

    Main Results:

    • A series of spatially separated attosecond pulses was generated.
    • The generation frequency was reduced from twice to once per optical cycle.
    • Increased temporal separation led to improved pulse contrast.
    • The signal exhibited a 2π periodicity with respect to the CEP scan.

    Conclusions:

    • The attosecond lighthouse provides a method for generating temporally separated attosecond pulses.
    • Modulating the driving field with a second harmonic beam enhances pulse contrast.
    • Carrier envelope phase stability is crucial for controlling attosecond pulse generation.