Abstract
In the previous chapters the propagation of electromagnetic waves has been described in different ways.
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Notes
- 1.
In general the dipole moment is defined as \( \vec{p} = \int {{\text{d}}\vec{x} \, \rho \left( {\vec{x}} \right) \cdot \vec{x}} \), with the electric charge density ρ. For approximately point-shaped charges the integral can be reduced to the formula according to Gl. 7.1.
- 2.
In the classical picture, the attenuation describes the reduction of the oscillation amplitude as a consequence of a dissipative energy loss, e.g. due to mechanical friction. These processes cannot be reversed to result in an energy gain (2nd law of thermodynamics). Thus the damping coefficient is always positive.
- 3.
The phase of the respective wave function.
- 4.
With laser resonators a Q-factor of Q > 107 can be achieved.
- 5.
In case of a two level system, the indices of the Einstein coefficients are redundant and thus are omitted in the following.
Reference
Brehm, J.J. and Mullin, W.J., “Introduction to the Structure of Matter: A Course in Modern Physics,” (Wiley, New York, 1989) ISBN 047160531X.
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Poprawe, R., Boucke, K., Hoffman, D. (2018). Interaction of Light and Matter. In: Tailored Light 1. RWTHedition. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-01234-1_7
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DOI: https://doi.org/10.1007/978-3-642-01234-1_7
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