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Which outcome occurs when rapid thermal cycling induces stress in laser optics?

A)Reduced beam quality and astigmatism
B)Wavelength shift towards infrared
C)Increased reflective coating lifespan
D)Improved thermal conductivity of lens

💡 Explanation

Repeated thermal expansion and contraction causes mechanical failure of lens coatings due to thermal fatigue mechanism. This introduces surface distortions; therefore, beam quality reduces because wavefront errors arise rather than simple wavelength shifts or improved material conductivity.

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