Parallel detection of Jones-matrix elements in polarization-sensitive optical coherence tomography

Area of Science:

• Biomedical Optics
• Ophthalmology
• Medical Imaging

Background:

• Characterizing sample polarization properties typically requires Jones matrix measurements using two incident polarization states.
• Conventional polarization-sensitive optical coherence tomography (PS-OCT) methods often face drawbacks like reduced A-scan rates or axial depth range when employing multiplexing schemes.
• High A-scan rates and axial depth range are crucial for clinical applications, particularly for imaging the anterior eye segment.

Purpose of the Study:

• To develop a novel PS-OCT method that overcomes the limitations of existing techniques regarding A-scan rate and axial depth range.
• To enable efficient and accurate polarization-sensitive imaging of the anterior eye segment.

Main Methods:

• A parallel-detection approach was implemented using a fiber-optic interferometer with polarization-maintaining components.
• Swept-source OCT (SS-OCT) was utilized in conjunction with parallel detection.
• A numerical correction method, using signals from a static mirror, was developed to address synchronization challenges between A-scans and detection channels.

Main Results:

• The developed PS-OCT method successfully maintained the same A-scan rate and axial measurement range as conventional OCT.
• The system demonstrated effective imaging of the anterior eye segment, from the cornea to the posterior surface of the crystalline lens.
• The parallel-detection approach eliminated the need for complex polarization management.

Conclusions:

• The novel parallel-detection PS-OCT method offers a significant advancement for clinical imaging of the anterior eye segment.
• This technique provides high-resolution, polarization-sensitive imaging without compromising speed or depth range.
• The developed numerical correction ensures accurate Jones matrix measurements, crucial for diagnostic applications.