Which risk increases when thermal lensing occurs within a pulsed laser?

A)Catastrophic optical damage threshold reached✓

B)Far-field beam divergence decreases

C)Pulse duration undergoes significant shortening

D)Wavelength experiences a blue spectral shift

💡 Explanation

Thermal lensing creates a refractive index gradient in the laser medium, because absorbed power rises, causing beam waist reduction, intensifying the fluence; therefore, this optical damage risk rises, rather than beam improvement under ideal conditions.

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Which risk increases when thermal lensing occurs within a pulsed laser?

💡 Explanation

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