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1. Reminders about resonators
The theory is based on the study of the electromagnetic field generated by stimulated emission in the resonator. Since Kogelnik and Li , a distinction has been made between stable and unstable resonators, each giving rise to a particular type of operation and beam.
1.1 Stable resonator
For these resonators (figure 1 ), the most widespread, the most telling way of approaching the question is an analysis made in 1961 by Fox and Li
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Reminders about resonators
Gaussian beam characteristics
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