A sapphire crystal doped with titanium absorbs strongly around 500 nm. Calculate the difference in the...

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A sapphire crystal doped with titanium absorbs strongly around 500 nm. Calculate the difference in the refractive index of the doped crystal above and below the 500 nm absorption band if the density of absorbing atoms is I x 1025 m-3. The refractive index of undoped sapphire is 1.77. A sapphire crystal doped with titanium absorbs strongly around 500 nm. Calculate the difference in the refractive index of the doped crystal above and below the 500 nm absorption band if the density of absorbing atoms is I x 1025 m-3. The refractive index of undoped sapphire is 1.77.