Abstract
We investigate the influence of the complete linear atom-field interaction on the frequency spectrum of a solid-state laser in the frame of the semi-classical theory. The complete linear interaction energy ( i.e. the “paramagnetic” part of the interaction) can be split into three parts which cause (i) resonant atomic transitions, (ii) anti-resonant atomic transitions, and (iii) energy-dependent shifts of the atomic levels. An initially monochromatic field is modified by these three mechanisms in the following way: 1. (i) Through resonant atomic transitions the field remains monochromatic but its frequency is modified. 2. (ii) Through resonant and antiresonant transitions the initial frequency is modified and all odd harmonics of the modified frequency appear in the electric field. 3. (iii) Through resonant atomic transitions between energy-dependent atomic levels the initial frequency is modified and all harmonics (even and odd) of the modified frequency appear in the electric field. In case (iii) it turns out that the field frequency shift is intensity-dependent, a feature which may be relevant for high intensity lasers.
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