The photodarkening suppression effect of an 813-nm -doped ZBLAN fiber amplifier has been investigated. We have experimentally observed that a photodarkened fiber can be bleached by an 813-nm light and that the photoinduced loss during the amplifier operation is effectively suppressed with the help of the high-power signal. To the best of our knowledge, this is the first investigation of the photodarkening suppression by using a higher power signal in -doped fiber amplifiers. Based on these signal photodarkening suppression effects, we have designed a multistage fiber amplifier, and demonstrated the stable operation of the 1.15-W fiber master oscillator power amplifier at 813 nm without additional photobleaching light.
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Theoretical Study on Transverse Mode Instability in Raman Fiber Amplifiers Considering Mode Excitation.
Micromachines (Basel)
October 2024
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China.
Article Synopsis
- Raman fiber lasers (RFLs) utilize the stimulated Raman scattering effect to create laser beams with benefits like adjustable wavelengths and low quantum defects, but increased power leads to significant heat generation.
- This heat can cause transverse mode instability (TMI), making it a key obstacle in enhancing RFL performance.
- The study presents a static model for TMI in high-power Raman fiber amplifiers, exploring various factors that influence TMI threshold power and establishing a formula that aids in understanding and mitigating TMI.
The photodarkening suppression effect of an 813-nm -doped ZBLAN fiber amplifier has been investigated. We have experimentally observed that a photodarkened fiber can be bleached by an 813-nm light and that the photoinduced loss during the amplifier operation is effectively suppressed with the help of the high-power signal. To the best of our knowledge, this is the first investigation of the photodarkening suppression by using a higher power signal in -doped fiber amplifiers.
View Article and Find Full Text PDFIn this work, quasi-static mode degradation in high power fiber amplifiers has been investigated experimentally. An increase of M from 1.3 to 2.
View Article and Find Full Text PDFA novel method for mitigating photo-darkening and the effective photo-bleaching phenomenon by 532 nm cladding pump in Yb-doped fiber were herein reported. Compared with the pristine fiber, beyond 30% of photo-darkening induced excess loss was suppressed by 532 nm pretreatment. Moreover, the excess loss in the photo-darkened fiber was completely bleached with 532 nm pump.
View Article and Find Full Text PDFThe laser performance of a high-power ytterbium-doped fiber amplifier is mainly hindered by the onset of mode instability. In this work, the slope efficiency and mode instability threshold of the ytterbium-doped fiber under various gamma-ray radiation doses have been measured. Experimental results reveal that gamma-ray radiation-induced photodarkening degrades mode instability severely, and gamma-ray radiation-induced mode instability degradation can be partly bleached by hours of pump-light injection.
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