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← ScienceWhich limitation arises under increased photodiode laser drive current?
A)Decreased spatial coherence reduces focal quality✓
B)Increased resistance leads to thermal runaway
C)Reduced quantum efficiency lowers sensitivity
D)Excess carriers cause modulation bandwidth narrowing
💡 Explanation
Sufficiently driving a laser photodiode increases beam divergence and thus, reduces coherence; because the drive current is beyond gain saturation. Therefore spatial coherence degrades, rather than other failure modes like thermal runaway, at this operating condition.
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