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In the previous discussion of the output power we did not take the mode structure into account. The volume of the beam inside the medium was only characterized by an effective cross sectional area \(A_{b}\) resulting inFill factor a fill factor \(\gamma = A_{b} /A\) , with \(A\) being the cross sectional area of the active medium. The question we want to answer in this Chapter is how the beam cross section has to be defined to get a realistic expression for the output power of a laser resonator. In Part III we defined the mode radius w by using the second intensity moments. A first approximation, therefore, would be to use this mode radius for the definition ofBeam diameterdefinition of the mode cross section Ab = πw2.

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Influence of Gain on Mode Structure and Loss

  • 章节

  • 发表日期：

    2025年

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  • Norman Hodgson,
  • Horst Weber

摘要

In the previous discussion of the output power we did not take the mode structure into account. The volume of the beam inside the medium was only characterized by an effective cross sectional area \(A_{b}\) resulting inFill factor a fill factor \(\gamma = A_{b} /A\) , with \(A\) being the cross sectional area of the active medium. The question we want to answer in this Chapter is how the beam cross section has to be defined to get a realistic expression for the output power of a laser resonator. In Part III we defined the mode radius w by using the second intensity moments. A first approximation, therefore, would be to use this mode radius for the definition ofBeam diameterdefinition of the mode cross section Ab = πw2.