The refractive indices at 630 nm and thicknesses of the coatings.
| Sample | Thickness (nm) | Refractive index |
|---|---|---|
| 400 °C | 142 | 1.62 |
| 500 °C | 131 | 1.63 |
| 600 °C | 124 | 1.63 |
| 700 °C | 118 | 1.64 |
| 800 °C | 106 | 1.67 |
| 900 °C | 100 | 1.70 |
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