Which risk increases when optical feedback enters laser?

💡 Explanation

Coherence collapse increases because back reflections cause perturbations in the laser's gain medium, resulting in significant phase and amplitude fluctuations; therefore coherence is disrupted, rather than other effects like spontaneous emission, which are related to separate cavity properties.

• Which phenomenon reduces fringe visibility when spectral linewidth broadens in Michelson interferometry?
• Which mechanism causes increased resistance when mechanical stress distorts a piezoelectric crystal?
• Which outcome results when mismatched molecular orbital symmetries undergo [forbidden] cycloaddition?
• Which outcome occurs when differential stress is applied rapidly to crystalline ceramic materials?
• Which consequence results when decay heat overwhelms reactor cooling?
• Which mechanism causes increased solubility in supercritical fluids?