Modal instability of rod fiber amplifiers: a semi-analytic approach

被引：2
|
作者：
Jorgensen, Mette Marie [1 ]
Hansen, Kristian Rymann [1 ]
Laurila, Marko [1 ]
Alkeskjold, Thomas Tanggaard
Laegsgaard, Jesper [1 ]
机构：
[1] DTU Foton, Orsteds Plads, DK-2800 Lyngby, Denmark
来源：
FIBER LASERS X: TECHNOLOGY, SYSTEMS, AND APPLICATIONS | 2013年 / 8601卷
关键词：
Fiber amplifiers; modal instability; microstructered fibers; high power amplifiers; thermal effects; POWER; LASERS; OPERATION;
D O I：
10.1117/12.2001412
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The modal instability (MI) threshold is estimated for four rod fiber designs by combining a semi-analytic model with the finite element method. The thermal load due to the quantum defect is calculated and used to numerically determine the mode distributions on which the expression for the onset of MIs is highly dependent. The relative intensity noise of the seed laser in an amplifier setup is used to seed the mode coupling between the fundamental and higher order mode, and lead to MI threshold values of 174 W - 348 W of extracted output power for the four rod fibers having core diameters in the range 53 mu m - 95 mu m.
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页数：8
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