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Controlling Photon Transverse Orbital Angular Momentum in High Harmonic Generation.
Yiqi Fang1, Shengyue Lu1,2, Yunquan Liu1,2,3,4
1State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China.
Physical Review Letters
|January 21, 2022
Summary
This study explores high harmonic generation (HHG) using spatiotemporal optical vortex (STOV) pulses, revealing unique spectral structures and offering a method to control topological charge and harmonic properties.
Area of Science:
- Quantum Optics
- Nonlinear Optics
- Attosecond Science
Background:
- High harmonic generation (HHG) with longitudinal orbital angular momentum is well-studied.
- Investigating HHG with transverse orbital angular momentum is a novel area.
Purpose of the Study:
- To investigate high harmonic generation (HHG) driven by spatiotemporal optical vortex (STOV) pulses.
- To explore the unique spectral structures arising from transverse orbital angular momentum in HHG.
- To develop a method for controlling the spatiotemporal topological charge and spectral properties of high-order harmonics.
Main Methods:
- Utilizing spatiotemporal optical vortex (STOV) pulses to drive high harmonic generation.
- Analyzing spatial-resolved harmonic spectra to identify unique structures.
- Employing two-color counterspin and countervorticity STOV pulses for control experiments.
Main Results:
- Observed unique spatial-resolved harmonic spectra, including spatially spectral tilt and fine interference patterns.
- Demonstrated that these spatiospectral structures originate from macroscopic and microscopic effects of spatiotemporal optical singularity.
- Developed a robust method to control spatiotemporal topological charge and spectral structure of high-order harmonics using tailored STOV pulses.
Conclusions:
- Spatiotemporal optical vortex pulses enable novel HHG dynamics with transverse orbital angular momentum.
- The study provides insights into the fundamental physics of HHG with optical vortices.
- A controllable method for manipulating harmonic properties based on spatiotemporal topology was established.
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