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← ScienceWhich effect occurs when increasing laser pulse duration beyond coherence time?
A)Speckle pattern contrast reduces significantly✓
B)Precise wavelength amplification of specific spectra
C)Enhanced stimulated emission of pump photons
D)Significantly reduced energy conversion efficiency
💡 Explanation
Increasing pulse duration beyond coherence reduces spatial correlation because individual wave fronts become uncorrelated; therefore, the speckle contrast weakens, rather than wavelength amplification or improved conversion, which concerns monochromatic beam energy.
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