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Which 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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