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← ScienceWhich alignment risk worsens when amplifying a pulsed laser?
A)Thermal lensing in amplifier medium✓
B)Reduced coherence limits focal depth
C)Chromatic aberration blurs the beam
D)Fresnel losses increase at interfaces
💡 Explanation
Thermal lensing worsens because spatial temperature gradients induce refractive index variations via thermo-optic effect, therefore distorting the beam path rather than maintaining focus needed for amplification; rather than losses or aberration common in static laser systems.
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