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← ScienceWhich mechanism limits coherence length in excimer lasers?
A)Spontaneous emission broadens spectral linewidth✓
B)Stimulated emission reduces pulse duration
C)Non-linear amplification increases sidebands
D)Gain saturation narrows pulse spectrum
💡 Explanation
Spontaneous emission introduces photons with random phases; therefore, the coherence is limited because spontaneous emission broadens the spectral linewidth, rather than linewidth being narrowed by gain saturation or altered via stimulated emission.
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