cse • paper_1 • waves_oscillationscse-2011-subject-02-009
[UPSC CSE 2011] Polarisation and Modern Optics (Q399, 15M)
Bring out the essential differences between the physical principles of spontaneous and stimulated emission of radiation. Why is it difficult to get efficient lasing action in case of an ideal two-level material system? Can you propose a scheme to enhance efficiency? Discuss.
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