High-order harmonic generation by static coherent states method in single-electron atomic and molecular systems.

Area of Science:

• Quantum mechanics
• Atomic and molecular physics
• Laser physics

Background:

• High harmonic generation (HHG) is a crucial process for generating ultrashort light pulses.
• Accurate quantum simulations are needed to understand HHG in realistic molecular systems.
• The time-dependent Schrodinger equation is the fundamental equation governing quantum dynamics.

Purpose of the Study:

• To develop and apply the static coherent states (SCS) method for simulating HHG.
• To investigate HHG in the hydrogen molecular ion using SCS.
• To explore isolated attosecond pulse generation using SCS and polarization gating.

Main Methods:

• Solving the time-dependent Schrodinger equation using coherent states as basis sets.
• Applying the static coherent states (SCS) method to a full-dimensional single-electron system.
• Utilizing the polarization gating technique with counter-rotating circular laser pulses.

Main Results:

• The SCS method shows reasonable agreement with the 3D unitary split-operator approach for HHG in the hydrogen molecular ion.
• The study demonstrates the potential for isolated attosecond pulse generation using SCS.
• SCS is validated as a viable method for full-dimensional quantum simulations of molecular systems interacting with laser fields.

Conclusions:

• The static coherent states (SCS) method is a reliable tool for simulating high harmonic generation.
• SCS can be effectively used for generating isolated attosecond pulses.
• The SCS method offers a pathway for accurate quantum simulations of complex molecular systems in laser fields.