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Timestamp: 2019-04-25 12:57:43+00:00

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For some space applications, sensors are sensitive to light polarization and can only be properly calibrated with non-polarized light. Here we propose new optical devices which allow to depolarize light in a spatial process. These devices are thin film multilayers which exhibit polarimetric phase variations in their plane. A zero spatial polarization degree can be reached with high accuracy in a controlled bandwidth.
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Fig. 1. Example of 1D-transverse variations of the polarimetric phase difference at the surface x–y of the device.
Fig. 2. Incident, local and global polarizations plotted on the Poincaré sphere with γ = π/20.
Fig. 3. Incident, local and global polarizations plotted on the Poincaré sphere with γ = π/60.
Fig. 4. Incident, local and global polarizations plotted on the Poincaré sphere with γ = π/60 for an arbitrary elliptical incident polarization (see text) with β ≠ 1.
Fig. 5. Incident, local and global polarizations plotted on the Poincaré sphere with a random phase distribution (For greater clarity, only the polarizations corresponding to the first line of the filter are plot).
Fig. 6. Draft on non-uniformity effects at the surface sample (see text).
Fig. 8. Spectral variations of polarization ratio (full lines) in situations where the band-pass condition Eq. (67) is satisfied (blue curve) or not (orange curve). The polarization degree (yellow dashed curve) is also plotted in the case where the bandpass condition is satisfied (see text).
Fig. 9. Case where the gradient mirror M0(x) is deposited on a flat mirror Madd (see text).
Fig. 10. Intensity spectrum of the total mirror M(x), versus wavelength and x position. We observe that an intensity (horizontal) bandwidth is hold whatever the x-position. The left and right figures are given for TM and TE polarizations, respectively. The oblique bandwidth is that of the gradient mirror M0(x).
Fig. 12. Spectral variations of the polarization degree of the total mirror M(x), for different uniformity values which correspond to: Δe/e = 5%, 25%, 50%, 75% and 100%. Total depolarization is reached in the whole mirror band-pass. The reflection spectrum of the gradient mirror is also is plotted in dashed line (see text).
Fig. 13. Spectral variations of the polarization degree of a narrow-band filter (see text). The green curve is for the flat coating while the red curve is for the gradient coating.
Fig. 14. TE reflected beam versus wavelength and spatial frequency. The left figure is the reference (see text) and the right figure emphasizes additional diffraction effects.
Fig. 15. TM reflected beam versus wavelength and spatial frequency. The left figure is the reference (see text) and the right figure emphasizes additional diffraction effects.
Fig. 16. TE and TM reflected beams after re-centering, for comparison to Fig. 15 (see text).
Fig. 17. Detail of beam alteration at two wavelengths λ1 = 500nm and λ2 = 633nm (see text). The λ1 pattern is quasi-superimposed to the reference, while noticeable differences can be seen for the λ2 pattern plotted in dashed line. The left and right figures are given for TM and TE polarization respectively.
Fig. 18. Ratio versus wavelength of reflected energy from the depolarizing device and from the reference. The frequency range of integration is 1/L in the left figure and 3/L in the right figure.
Fig. 19. Case of a birefringent substrate.

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