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← ScienceWhich outcome occurs when the temporal coherence of a femtosecond laser oscillator degrades?
A)Reduced pulse duration at target
B)Increased wavelength center drift
C)Improved spectral output stability
D)Decreased interference fringe contrast✓
💡 Explanation
Decreased interference fringe visibility occurs because degradation leads to a shorter coherence length via the Wiener-Khinchin theorem; the optical path difference then exceeds this length, destroying interference. Therefore contrast decreases rather than stability because photons no longer have fixed phase relationships.
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