1.5 Population inversion and laser operation

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Presentation transcript:

1.5 Population inversion and laser operation gain losses Condition of operation:

1.6 Interaction of light and matter IR, VIS, UV: OK X-rays: not OK Dipole approximation valid when: Electric dipole moment Magnetic dipole interaction

1.7 Coherent excitation of a two-level system TDSE: Time-dependent Hamiltonian: Using the molecular eigenstates as a basis, one obtains a matrix equation: Remember:

Rabi oscillations |2> |1>

Atomic orbitals http://www.geo.arizona.edu/xtal/nats101/orbitals.jpg

Emission spectroscopy of the hydrogen atom

Emission spectrum of the hydrogen atom