Which performance limit manifests when high-frequency signals exceed a Bragg grating's photothermic effects threshold?

💡 Explanation

The optical band gap broadens because elevated temperatures through photothermic effect alter the refractive index via thermal expansion, disrupting the designed grating periodicity. Therefore, the band-gap broadens, rather than shifting wavelength or inducing instability, due to material property alterations.

• Which consequence occurs when a molecular orbital's energy level lowers?
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