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Explain absorption, spontaneous and stimulated emission of radiation. Discuss Einsteins coefficient and derive the relation between them?
written 7.9 years ago by gravatar for neeta.vanage neeta.vanage • 880 modified 3.9 years ago by gravatar for pedsangini276 pedsangini276 • 4.8k

Subject :- Applied Physics 2.

Topic :- Laser.

Difficulty :- Medium.
engineering physics
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written 7.8 years ago by gravatar for neeta.vanage neeta.vanage • 880 modified 7.7 years ago by gravatar for yashbeer yashbeer ★ 11k

When a material medium is exposed to external radiation, three process takes place in if. For simplicity consider a substance in which atoms have only two allowed energy level states- ground state and excited state. When this substance is exposed to a radiation of a stream of photons each carrying …

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