Generating coherent broadband continuum soft-x-ray radiation by attosecond ionization gating

Area of Science:

• Ultrafast Science
• Attosecond Physics
• Nonlinear Optics

Background:

• Current isolated attosecond pulse generation relies on few-cycle driver lasers with stabilized electric fields.
• This limits the flexibility and tunability of attosecond pulse production.

Purpose of the Study:

• To demonstrate a new gating mechanism for attosecond pulse generation.
• To enable broadband and tunable attosecond pulse production.
• To relax the stringent requirements on driver pulse characteristics.

Main Methods:

• Utilized time-dependent ionization of a conversion medium as a gating mechanism.
• Employed simulations and experimental validation.
• Investigated the role of carrier-envelope phase as a control parameter.

Main Results:

• Successfully restricted high-harmonic generation to a few optical cycles on the leading edge of a laser pulse.
• Achieved broadband and tunable attosecond pulse generation.
• Demonstrated carrier-envelope phase as a control for the attosecond pulse center frequency.

Conclusions:

• The developed gating mechanism offers a pathway to relax the requirement for few-cycle driver pulses.
• This approach provides enhanced control over attosecond pulse properties, including tunability.
• Paves the way for more accessible and versatile attosecond pulse generation.