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← ScienceWhich outcome occurs when a femtosecond laser pulse exhibits third-order dispersion within an optical fiber?
A)Raman scattering increases sharply
B)Self-phase modulation broadens spectrum
C)Pulse front distortion generates chirps✓
D)Four-wave mixing generates new frequencies
💡 Explanation
Pulse front distortion generates chirps because of third-order dispersion, leading to varying arrival times across the pulse's transverse profile. Therefore, temporal broadening occurs rather than spectral changes, which would be induced by self-phase modulation alone.
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