Which limitation arises when an uncorrected pulsed laser heats a Bragg grating?

💡 Explanation

Transient grating thermal phase chirp limits pulsed lasers heating Bragg gratings, because localized heating induces varying refractive indices which affects the the grating's periodicity during the pulse. Therefore, the pulse broadens in k-space, rather than reflecting uniformly because coherence is disrupted by time-varying chirp.

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