A hundred-watt level spatial mode switchable all-fiber laser is demonstrated based on a master oscillator power amplifier scheme. The mode switchable seed laser is implemented by integrating a homemade acoustically induced fiber grating (AIFG) mode converter inside the cavity, and the output power was scaled to > 100 W in both LP01 and LP11 mode. Fast mode switching with millisecond scale switching time between LP01 and LP11 mode while operating in full power is realized through the AIFG driven by radio frequency modulation. This work could provide a good reference for realizing high-power agile mode-switchable fiber lasers for practical applications.
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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