Volume 26 - ICOP & ICPET 2020                   ICOP & ICPET _ INPC _ ICOFS 2020, 26 - ICOP & ICPET 2020: 533-536 | Back to browse issues page

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Pumping configuration effect on the transverse mode instability in high power fiber lasers
Ali Roohforouz * 1, Reza Eyni Chenar1 , Saeed Azizi1 , Reza Rezaei-Nasirabad1 , Kamran Hejaz1 , Vahid Vatani1 , Seyed hasan Nabavi1
1- Iranian National Center for Laser Science and technology, Tehran, Iran
Abstract:   (1547 Views)
Transverse Mode Instability (TMI) as a substantial restriction for further power scaling of high-power fiber lasers has been investigated and its occurrence power threshold in a 3.02 kW level fiber oscillator has been compared in co-, counter- and bidirectional pumping schemes. Experimental results show that TMI power threshold in a bidirectional-pumping scheme is higher than that of co- and counter-pumping configurations. It is also observed that counter pumping method has higher TMI threshold than co-pumping scheme. The TMI threshold of bidirectional-pumping is higher than co/counter-pumping because the index gratings generated in the bidirectional-pumping scheme is smoother than that of co/counter-pumping configuration.
Keywords: Fiber lasers, Mode instability, Fiber oscillator, Transverse modes.
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Type of Study: Research | Subject: Special
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