This conference presentation was prepared for the Advanced Lasers, High-Power Lasers, and Applications XIII conference at PA22 SPIE/COS Photonics Asia, 2022
A random distributed feedback Raman fiber laser (RRFL) based on graded-index (GRIN) fiber with brightness enhancement (BE) is demonstrated. Pumped by temporally stable amplified spontaneous emission source, the output power of 722 W at 1130 nm is achieved thanks to the effective suppression on higher-order Stokes generation. Besides, benefiting from the beam cleanup effect in GRIN fiber, the beam quality factor M2 of the signal laser at maximum output is 4.65 corresponding to the BE factor of 8.9. To the best of our knowledge, this is the record output power of RRFL based on GRIN fiber with BE.
In this article, we present the first-ever mode-resolved bending loss measurement for Large-mode-aera (LMA) fiber based on S2 mode measurement method. The new method can be extended to measure the bending loss of all high order modes (HOMs) of LMA fiber at different bending radii, which is more accurate than previously reported methods. What is more, it can provide guidance for the design and control of LMA fiber, and provide parameter basis for the beam quality optimization of high-power fiber laser (HPFL) system.
Agile mode switching between LP01 mode and LP11 mode and power amplification in specific mode can be achieved at the same time by inserting an acoustically-induced fiber grating into a Raman fiber amplifier. The maximum signal light output power of the LP01 mode and LP11 mode is 8.51W and 7.98 W with the characteristic frequency of 769 kHz and 763 kHz, respectively. Moreover, the ratio of the two modes can be adjusted by modulating the frequency loaded on the acoustically-induced fiber grating. This work could provide an example of realizing a mode-switchable Raman fiber amplifier for practical application.
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