Agile mode switching between LP01 and LP11 modes in an all-fiber laser is demonstrated by exploiting an acoustically induced fiber grating within the laser cavity. The laser exploits a cladding pump configuration and can deliver up to 5.85 W of stable output power in LP11 mode at 1070.07 nm and 6.06 W in LP01 mode at 1070.48 nm, with a slope efficiency near 50%. Complete mode-switching speed with 250 Hz and partial mode-switching speed with 1 kHz are demonstrated. Based on the obtained switching time between LP11 and LP01 mode, the maximum complete mode-switching speed is calculated to be ∼555.56 Hz. Moreover, variable output beam profiles could be obtained by adjusting the frequency of the modulation signal applied on the acoustically induced fiber grating. This paper could provide an example of realizing a high-power, mode-switchable fiber laser source for practical use.

中文翻译：

---

通过腔内转换具有灵活模式切换能力的全光纤激光器

通过利用激光腔内的声诱导光纤光栅，演示了全光纤激光器中 LP01 和 LP11 模式之间的灵活模式切换。该激光器采用包层泵浦配置，可在 LP11 模式下在 1070.07 nm 下提供高达 5.85 W 的稳定输出功率，在 LP01 模式下在 1070.48 nm 下提供高达 6.06 W 的稳定输出功率，斜率效率接近 50%。演示了 250 Hz 的完整模式切换速度和 1 kHz 的部分模式切换速度。根据获得的 LP11 和 LP01 模式之间的切换时间，计算出最大完全模式切换速度为 ~555.56 Hz。此外，可以通过调整施加在声诱导光纤光栅上的调制信号的频率来获得可变的输出光束轮廓。本文可以提供一个实现高功率的例子，