Author:
Roohforouz Ali,Eyni Chenar Reza,Rezaei-Nasirabad Reza,Azizi Saeed,Hejaz Kamran,Hamedani Golshan Ali,Abedinajafi Ali,Vatani Vahid,Nabavi Seyed Hassan
Abstract
AbstractTo achieve a 3.02 kW Yb-doped fiber laser oscillator, the behavior of transverse mode instability (TMI) is experimentally studied in different pumping configurations; co, hybrid, counter, and bidirectional. A comparative analysis showed that population inversion saturation has a substantial impact on TMI threshold enhancement in high power fiber oscillators. Monitoring the dynamic power exchange of fundamental mode and higher-order mode of laser output beam indicates that in a hybrid pumping scheme, simultaneous pumping with two different wavelengths enhances the TMI threshold to a great stand. Moreover, injecting a few watts of pumping light in the counter direction mitigates the TMI caused by pumping in the co-direction. Calculation of population inversion in different pumping configurations using simulation shows that higher population inversion saturation leads to increasing the TMI threshold.
Publisher
Springer Science and Business Media LLC
Cited by
11 articles.
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