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Which 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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