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Which diffraction outcome causes spectral broadening in lasers?

A)Increased longitudinal mode competition
B)Self-phase modulation interference
C)Reduced transverse electromagnetic modes
D)Enhanced spatial hole burning rate

💡 Explanation

Self-phase modulation, a type of interference in laser cavities, generates new frequencies as pulse intensity varies, leading to spectral broadening, because of the time-dependent refractive index. Therefore, the answer is broadened spectra, rather than mode changes, because SPM directly induces new frequencies.

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