Polarization-sensitive OFDI using polarization-multiplexed wavelength-swept laser.

Area of Science:

• Biomedical Optics
• Medical Imaging
• Optical Coherence Tomography

Background:

• Polarization-sensitive optical frequency domain imaging (PS-OFDI) is crucial for characterizing tissue birefringence.
• Conventional PS-OFDI systems often involve complex polarization modulation or frequency-encoded multiplexing.
• There is a need for simpler, more robust, and cost-effective PS-OFDI techniques.

Purpose of the Study:

• To develop and demonstrate a novel, simplified PS-OFDI system.
• To enable accurate determination of Stokes vector components using a passive approach.
• To offer a low-cost alternative to existing complex PS-OFDI methods.

Main Methods:

• Implementation of a passive polarization multiplexing technique within the wavelength-swept light source.
• Modification of a fiber delay line to generate two perpendicular polarizations for illumination.
• Acquisition and analysis of reflected light from tissue to determine Stokes vector components at each depth.

Main Results:

• Successful demonstration of a novel all-passive PS-OFDI system.
• The system enables illumination with two perpendicular polarizations via a simple fiber delay line modification.
• The developed method provides a robust and low-cost solution for PS imaging.

Conclusions:

• The novel passive polarization multiplexing approach offers a significant advancement in PS-OFDI.
• This technique simplifies the hardware requirements and reduces the cost of PS imaging systems.
• The demonstrated system is a viable and effective alternative to conventional complex PS-OFDI schemes for biomedical applications.