Real-time OAM cross-correlator based on a single-pixel detector HOBBIT system.

Area of Science:

• Optics and Photonics
• Light-Matter Interactions
• Quantum Information Science

Background:

• Transient orbital angular momentum (OAM) is crucial for sensing and light-matter interactions.
• Existing detection methods face limitations in frequency response due to modulation techniques.

Purpose of the Study:

• Introduce a new method for coherent detection of transient OAM properties.
• Develop a single pixel detector system for OAM spectrogram generation.
• Enable high-speed (MHz) analysis of dynamic OAM states.

Main Methods:

• Utilize acousto-optic correlator principles with log-polar optical elements.
• Integrate higher-order Bessel beams in time (HOBBIT) for OAM analysis.
• Employ a single pixel detector for coherent detection and spectrogram creation.

Main Results:

• Demonstrated creation and detection of OAM spectrograms.
• Successfully analyzed beams with time-varying OAM properties.
• Investigated coherent combinations and transient scattering by phase objects.

Conclusions:

• The proposed method offers a high-frequency response for transient OAM detection.
• This technique advances the study of dynamic light properties in various applications.
• The OAM spectrogram provides a powerful tool for analyzing complex light-matter interactions.