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← ScienceWhich risk increases when a high humidity environment compromises the Zinc Selenide (ZnSe) lens in a CO2 laser cutting system?
A)Enhanced Fresnel diffraction effects in atmosphere
B)Reduced laser beam coherence length rapidly
C)Catastrophic thermal runaway of laser cavity✓
D)Increased mode-locking effect with pulse broadening
💡 Explanation
Catastrophic thermal runaway inside resonant system occurs because moisture absorbed by the ZnSe lens leads to increased absorption of the 10.6 μm laser wavelength, causing rapid, uncontrolled heating; therefore lens cracks rather than beam effects or mode anomalies.
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