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Spontaneous and Stimulated Emission of Radiation by Professor G Srinivasan
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- 1 Summer course 2018 - A Random walk in astro-physics
- 2 Spontaneous and Stimulated Emission of Radiation Lecture - 02
- 3 Quantum theory of radiation
- 4 The opening sentence of Einstein's 1917 paper:
- 5 But Einstein wanted his quantum theory to give Planck's Law!
- 6 Einstein's profound insight in 1917:
- 7 Definition of the Einstein coefficients in Quantum Mechanics
- 8 Spontaneous Emission
- 9 Stimulated emission
- 10 Absorption and Emission coefficients in terms of the Einstein Coefficients.
- 11 Absorption coefficient alpha
- 12 It is useful to regard stimulated emission as negative absorption .
- 13 Inverted population
- 14 Two-state systems in Quantum Mechanics
- 15 Zeeman splitting of energy levels
- 16 Hyperfine splitting of energy levels
- 17 Fine structure of energy levels of electron in atoms
- 18 Hyperfine Splitting
- 19 Hyperfine splitting of ground state of hydrogen atom Enrico Fermi, 1930
- 20 After some standard steps,
- 21 Radial wave function of Is electron in a hydrogen atom
- 22 Hyperfine splitting of n=1 level of hydrogen atom
- 23 Ammonia molecule
- 24 Electric dipole moment of Ammonia molecule
- 25 Two-state systems in Quantum Mechanics
- 26 Maser
- 27 Ammonia Maser
- 28 Hydrogen Maser
- 29 The Nobel Prize in Physics 1964
- 30 3-level laser
- 31 Celestial Masers
- 32 Next Lecture - The Interstellar Medium
- 33 Q&A
