Polarization phase unwrapping by a dual-wavelength Mueller matrix imaging system

Jiawei Song; Jiawei Song; Wei Guo; Wei Guo; Nan Zeng; Hui Ma; Hui Ma; Hui Ma

doi:10.1364/OL.488675

Optics Letters
Vol. 48,
Issue 8,
pp. 2058-2061
(2023)
•https://doi.org/10.1364/OL.488675

Polarization phase unwrapping by a dual-wavelength Mueller matrix imaging system

Jiawei Song, Wei Guo, Nan Zeng, and Hui Ma

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Jiawei Song, Wei Guo, Nan Zeng, and Hui Ma, "Polarization phase unwrapping by a dual-wavelength Mueller matrix imaging system," Opt. Lett. 48, 2058-2061 (2023)

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Abstract

In this Letter, we report a dual-wavelength Mueller matrix imaging system for polarization phase unwrapping, allowing simultaneous acquisition of the polarization images at 633 nm and 870 nm. After phase unwrapping, the relative error of linear retardance is controlled to be 3% and the absolute error of birefringence orientation is about 6°. We first show that polarization phase wrapping occurs when the samples are thick or present obvious birefringence effects, and further analyze the effect of phase wrapping on anisotropy parameters via Monte Carlo simulations. Then, experiments on porous alumina with different thicknesses and multilayer tapes are performed to verify the feasibility of phase unwrapping by a dual-wavelength Mueller matrix system. Finally, by comparing the temporal characteristics of linear retardance during tissue dehydration before and after phase unwrapping, we emphasize the significance of the dual-wavelength Mueller matrix imaging system not only for anisotropy analysis in static samples, but also for determining the trend in polarization properties of dynamic samples.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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MC Parameters	Wavelengths
Values	532 nm	633 nm	870 nm
μ_s/cm⁻¹	31.9	20	7.5
μ_c/cm⁻¹	287.5	180	67.5
Δn	1 × 10⁻⁴: 1 × 10⁻⁴: 3 × 10⁻³
Birefringence Orientation	−30°
Sample Thickness	600 μm
Fiber Orientation	x Axis

Region	δ_633c	η·δ_870c	E_δ	θ_633c	θ_870c	E_θ (°)
1	0.67	0.68	1.5%	9.29	8.73	0.56
2	0.69	0.70	1.4%	20.81	20.27	0.54
3	0.85	0.86	1.2%	84.40	84.03	0.37
4	0.38	0.39	2.6%	37.38	37.18	0.20
5	0.44	0.45	2.3%	59.00	58.46	0.54
6	0.60	0.61	1.7%	−56.77	−57.10	0.33

Region	δ_633c	η·δ_870c	E_δ	θ_633c	θ_870c	E_θ (°)
1	3.88	3.97	2.3%	−62.24	−66.87	4.63
2	4.05	3.96	2.2%	−5.44	−13.67	8.23
3	3.78	3.85	1.9%	−17.61	−19.65	2.04
4	2.40	2.33	2.9%	36.56	36.54	0.02
5	1.71	1.68	1.8%	62.05	61.09	0.36
6	2.26	2.24	0.9%	52.36	54.03	1.67

Region	δ_633c	η·δ_870c	E_δ	θ_633c	θ_870c	E_θ (°)
1	13.58	13.36	1.6%	−52.08	−52.26	0.18
2	30.91	31.19	0.9%	−63.78	−64.36	0.58
3	14.09	13.94	1.1%	−68.42	−51.02	17.40
4	7.30	7.40	1.4%	−51.33	−38.75	12.58
5	39.99	40.02	0.1%	−74.37	−70.30	4.07
6	15.57	15.23	2.2%	−5.06	−11.66	6.60
7	3.65	3.67	0.5%	−54.98	−54.97	0.01
8	7.02	7.14	1.7%	−53.28	−55.72	2.44
9	29.20	29.12	0.3%	−18.57	−17.65	0.92
10	22.69	22.60	0.4%	−3.03	−7.12	4.09

MC Parameters	Wavelengths
Values	532 nm	633 nm	870 nm
μ_s/cm⁻¹	31.9	20	7.5
μ_c/cm⁻¹	287.5	180	67.5
Δn	1 × 10⁻⁴: 1 × 10⁻⁴: 3 × 10⁻³
Birefringence Orientation	−30°
Sample Thickness	600 μm
Fiber Orientation	x Axis

Abstract

Data availability

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Figures (8)

Tables (4)

Equations (8)

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