1.5 Population inversion and laser operation

gain

Condition of operation:

losses

1.6 Interaction of light and matter

Dipole approximation valid when:IR, VIS, UV: OKX-rays: not OK

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

|1>

|2>

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

Atomic orbitals

Emission spectroscopy of the hydrogen atom

Emission spectrum of the hydrogen atom