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(Color online) A scheme of the ellipsometric setup: (1) laser, (2) polarization generator, (3) DAC, (4) analyzer, (5) signal photodiode, (6) beam splitter, and (7) reference photodiode.
(Color online) The optics in a diamond anvil: (1) incidence light, (2) backing plate, (3) diamond, (4) sample material, and (5) stainless steel gasket. , , and represent the complex index of refraction for air, diamond, and sample material, respectively.
(Color online) A fit for the polarimetric measurements taken at 13.6 GPa. (a) The analyzer is in the first mode, Eq. (1) is used for the fit. (b) The analyzer is in the second mode, Eq. (2) is used for the fit. The deviation of the fitting parameter from the value 1 is less the for both graphs.
(Color online) A comparison of the pressure dependence of the ellipsometric parameter (a) during compression and (b) during decompression, with the phase fraction from Mössbauer measurements (Ref. 15). Ellipsometric measurements are in blue squares and Mössbauer measurements are in blank red circles. The lines are a guide for the eye.
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