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← ScienceWhich risk increases when laser light encounters an etalon with imperfections?
A)Unintended secondary mode amplification✓
B)Increased group velocity dispersion
C)Excessive stimulated Raman scattering
D)Significant self-phase modulation errors
💡 Explanation
Imperfect etalons cause variations in phase delay, leading to interference and thus uneven amplification across different frequencies. Therefore, off-axis modes may lase if their gain exceeds threshold because of constructive interference zones, rather than uniform single-mode output.
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