Role of spatial coherence in polarization tomography

Area of Science:

• Optics
• Light Scattering
• Coherence Theory

Background:

• Mueller matrices are essential for characterizing the polarization properties of optical systems.
• The spatial coherence of light can influence how it interacts with scattering media.
• Previous studies have not fully explored the impact of probe beam spatial coherence on Mueller matrix measurements.

Purpose of the Study:

• To investigate the influence of probe beam spatial coherence on the Mueller matrix of a paraxial optical scatterer.
• To demonstrate that the same scattering medium can yield different Mueller matrices based on the incident beam's spatial coherence.
• To alert experimentalists to the potential impact of spatial coherence in optical scattering measurements.

Main Methods:

• Utilizing a quasi-monochromatic, spatially coherent light beam for probing.
• Analyzing the Mueller matrix representation of a paraxial optical scatterer.
• Systematically varying the degree of spatial coherence of the incident probe beam.

Main Results:

• The Mueller matrix of an optical scatterer is dependent on the spatial coherence of the probing light beam.
• Different degrees of spatial coherence lead to distinct Mueller matrix representations for the identical scattering medium.
• This dependency highlights a critical factor often overlooked in scattering experiments.

Conclusions:

• Experimentalists must carefully consider and control the spatial coherence of probe beams in optical scattering studies.
• The spatial coherence of light is a crucial parameter that can alter the interpretation of Mueller matrix measurements.
• Failure to account for spatial coherence may lead to mischaracterization of scattering media.