Zusammenfassung
Bisher sind alle Einflüsse des aktiven Mediums vernachlässigt und die stationären Feldverteilungen im leeren Resonator diskutiert worden. Das aktive Medium wirkt aber durch zwei Effekte auf das im Resonator umlaufende Licht ein: die Intensität des Lichts wird bei jedem Durchgang durch das Medium verstärkt, wobei der Verstärkungsfaktor von der Lichtintensität abhängt, und die Ausbreitungsrichtung des Lichts wird durch die optischen Eigenschaften des Lasermaterials geändert. Modenstrukturen und Verluste unterscheiden sich deshalb von denen des passiven Resonators. Mit wachsender Verstärkung, d.h. mit wachsender Pumpleistung werden diese Unterschiede immer signifikanter, im Grenzfall extrem kleiner Pumpleistungen stimmen die Eigenschaften mit denen des passiven Resonators überein. Die ausführliche Diskussion der passiven Resonatoren bildet deshalb den idealen Ausgangspunkt, um die Änderungen die durch das aktive Medium verursacht werden zu verstehen. In diesem Kapitel werden neben den Einflüßen des Mediums auch die Abhängigkeit der Laserausgangsleistung von den Resonatorparametern, wie z.B. g-Parameter, Reflexionsgrad und Verluste behandelt, sowie Konsequenzen daraus für den optimalen Betrieb von Resonatoren gezogen.
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Hodgson, N., Weber, H. (1992). Aktive Resonatoren. In: Optische Resonatoren. Laser in Technik und Forschung. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-84576-5_5
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