Which outcome occurs when a multi-mode laser is focused through a turbulent medium?

A)Speckle pattern forms erratically✓

B)Beam divergence systematically decreases

C)Coherent length remains unchanged

D)Frequency bandwidth narrows drastically

💡 Explanation

An unstable speckle pattern forms because rapid, random fluctuations in the medium's refractive index induce constructive and destructive interference, a mechanism known as optical turbulence. Therefore, speckle rapidly changes, rather than the beam self-focusing or maintaining coherence under stable environments.

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Which outcome occurs when a multi-mode laser is focused through a turbulent medium?

💡 Explanation

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