Molecular Alignment Echo for Controlling the Readout Time of Vortex Beams.

Area of Science:

• Quantum optics
• Molecular physics
• Ultrafast laser science

Background:

• Molecular alignment echoes are phenomena where molecules rephase after excitation.
• Structured light fields with orbital angular momentum (OAM) offer unique light-matter interaction possibilities.
• Controlling molecular rotational states is key for quantum information processing.

Purpose of the Study:

• To experimentally demonstrate molecular alignment echoes driven by structured light.
• To investigate the storage and retrieval of OAM information in molecular rotational coherences.
• To establish a new method for optical processing of ultrashort OAM pulses.

Main Methods:

• Utilizing two time-delayed pump pulses with spatially varying polarization.
• Generating a molecular
• q plate
• in gaseous CO2.
• Employing vortex beams with topological charges ℓ=±1, 2 for validation.

Main Results:

• Achieved controllable rephasing of molecular alignment echoes.
• Demonstrated the storage and retrieval of OAM information in molecular rotational coherences.
• Validated the concept with various topological charges of vortex beams.

Conclusions:

• Extended molecular alignment echo mechanism to vector light fields.
• Established a novel route for optical processing of ultrashort OAM pulses.
• Advanced molecular-based quantum interfaces for structured light applications.