Dispersion-cancelled and dispersion-sensitive quantum optical coherence tomography.

Area of Science:

• Quantum optics
• Optical imaging
• Metrology

Background:

• Conventional optical coherence tomography (OCT) is a widely used imaging technique.
• OCT systems typically rely on broadband light sources.
• Limitations exist in resolving complex structures and measuring dispersion simultaneously.

Purpose of the Study:

• To demonstrate the capability of Quantum Optical Coherence Tomography (QOCT) for axial optical sectioning.
• To probe the longitudinal structure of multi-surface samples in a dispersion-cancelled manner.
• To simultaneously measure group-velocity dispersion between reflecting surfaces.

Main Methods:

• Utilized an entangled twin-photon light source for QOCT.
• Performed axial optical sectioning of a multi-surface sample.
• Implemented a dispersion-cancelled measurement approach.
• Measured group-velocity dispersion of interstitial media.

Main Results:

• Successfully probed the longitudinal structure of a sample with multiple surfaces.
• Achieved dispersion-cancelled measurements.
• Quantified the group-velocity dispersion between reflective interfaces.
• Compared QOCT results with conventional OCT.

Conclusions:

• QOCT offers a viable method for high-resolution structural imaging.
• The technique enables simultaneous dispersion measurement, a key advantage over conventional OCT.
• QOCT shows promise for applications requiring precise depth profiling and material characterization.