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Option A: see RefractiveIndex.INFO
Option B: If you have access, see the article
http://dx.doi.org/10.1016/S0022-3697(96)00219-3
which has both theoretical and experimental data. It depends on frequency, of course, and also whether you're talking about zincblende or wurtzite GaN. For wurtzite, it also depends on direction.
If I'm reading Figure 4 correctly, the zero-frequency index of refraction is supposed to vary between about 2.25 and 2.4, depending on structure and direction.
The article is from 1996, so presumably there are newer, better papers since then.
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∙ 15y ago
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