Transverse Mode Instability Analysis in Fibre Amplifiers

被引：13
作者：
Zervas, Michalis N. [1 ,2 ]
机构：
[1] Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants, England
[2] SPI Lasers UK Ltd, Adv Laser Lab, Southampton SO30 2QU, Hants, England
来源：
FIBER LASERS XIV: TECHNOLOGY AND SYSTEMS | 2017年 / 10083卷
关键词：
transverse mode instabilities; fiber amplifiers; fiber lasers; high power lasers; high power amplifiers; BEAM QUALITY; POWER; THRESHOLD; STRATEGIES; SCATTERING; ORIGIN;
D O I：
10.1117/12.2252435
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Mode instabilities in fiber amplifiers are analyzed by a new approach, considering the stability of the steady state FM amplification in the presence of transverse amplitude and/or phase perturbations, taking into account the effects of population inversion and thermal loading due to quantum-defect heating. Population inversion contribution to instability is shown to be dominant at low powers and high inversion. Under high powers and low inversion (high amplifier saturation) the thermal effects dominate the instability behavior. A simple and easy to interpret TMI power threshold formula is derived for the first time.
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页数：9
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