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Which outcome arises when overlapping laser beams lack temporal coherence?

A)Speckle pattern fluctuations occur
B)Diffraction fringes become more distinct
C)Polarization rotates erratically
D)Harmonic generation efficiency increases drastically

💡 Explanation

Speckle pattern fluctuations happen because the **interference** arising from incoherent laser beams varies randomly in time, therefore the speckle changes rapidly rather than remaining static, which only occurs with temporally coherent light sources.

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