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← ScienceWhich outcome results when thermal lensing occurs in a laser?
A)Decreased output beam mode quality✓
B)Increased laser cooling efficiency
C)Amplified stimulated Brillouin scattering
D)Increased gain medium coherence length
💡 Explanation
Thermal lensing creates a refractive index gradient within the gain medium because heat distorts the crystal introducing optical aberrations and reducing beam quality, therefore degrading mode quality rather than improving laser functionality or scattering, due to heat-induced refraction.
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