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1st Semester
BT-201
Unit 4 Notes

BT-201 Engineering Physics Unit 4 Notes

Notes and important questions for unit 4: Lasers.

Unit 4 · Short notes Lasers Einstein coefficients $A$ and $B$ · Population inversion and light amplification · Gas lasers (He‑Ne, CO$_2$) · Solid‑state lasers (ruby, Nd:YAG) · Properties of laser beams: monochromaticity, coherence, directionality, brightness · Laser speckles and applications

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