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Pressure and Temperature Dependence of the Absorption Edge in GaN
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10.We did not attempt to measure the pressure coefficient using polarized light since our best sapphire windows for the optical pressure vessel tended to depolarize the light. Without the optical bomb in position 99.7% of the light could be removed by crossed polarizers. However, if the pressure vessel was placed between the crossed polarizers (without the sample) only 70% of the light could be removed. Even if the sapphire windows are properly annealed, it has been found that by applying hydrostatic pressure to the windows they tend to strain and depolarize the light. Much care must be taken with selection and preparation of windows if polarization measurements under hydrostatic pressure are to be useful.
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