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Which problem arises when coherence length of the pulsed laser decreases during terahertz pulse generation?

A)Pulse envelope asymmetry increases strongly
B)Photogenerated carriers cause beam distortion
C)Terahertz generation efficiency improves greatly
D)Spatial chirp becomes insignificant rapidly

💡 Explanation

Decreased coherence length means a broader laser bandwidth; phase matching degrades. Therefore, temporal resolution worsens, causing increased pulse envelope asymmetry, because bandwidth broadens, rather than the alternatives involving carriers or improved generation applying when coherence increases. The mechanism here is dispersion.

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