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← ScienceWhich consequence results when optical feedback destabilizes a femtosecond laser cavity?
A)Pulse duration undergoes spectral broadening✓
B)Gain is reduced substantially
C)Photodiode sensitivity permanently increases
D)Amplified spontaneous emission decreases gradually
💡 Explanation
Unwanted optical feedback often broadens the pulse duration by introducing instabilities into the pulse shaping intracavity; because of the disruptive coupling through amplified spontaneous emission, mode-locking starts deteriorating, therefore temporal spreading is observed, rather than lower gain or increased sensitivity.
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