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随着光纤激光器输出功率的提高,对光纤耦合半导体激光泵浦模块的亮度提出了新的要求。为了进一步提高光纤耦合半导体激光模块的输出功率,提出了基于mini-bar的光纤耦合方法。这种方法具有耦合效率高、光学元件数量少等特点。本文通过采用mini-bar光纤耦合方案,实现光纤耦合半导体激光泵浦模块的高亮度输出。采用输出功率为30.5W的mini-bar进行光纤耦合,实现芯径为200μm,数值孔径NA为0.15的光纤27W的高功率输出,光纤耦合效率超过88%,通过光纤镀膜可以实现超过95%的耦合效率。采用芯径为105μm,数值孔径NA为0.15的光纤进行耦合实现输出功率达到23.8W,光纤耦合的效率超过78%,可以满足光纤激光对光纤耦合半导体激光泵浦模块的要求。
With the increase of the output power of the fiber laser, new requirements are put forward on the brightness of the fiber-coupled semiconductor laser pumping module. In order to further improve the output power of the fiber-coupled semiconductor laser module, a mini-bar based fiber coupling method is proposed. This method has the characteristics of high coupling efficiency and small number of optical components. In this paper, the mini-bar fiber coupling scheme is adopted to realize the high brightness output of fiber-coupled semiconductor laser pumping module. Fiber-coupled using a mini-bar with an output power of 30.5W to achieve a high-power output of 27W with a core diameter of 200μm and a numerical aperture NA of 0.15 with coupling efficiency over 88% and over 95% coupling via fiber coating effectiveness. The optical fiber with a core diameter of 105μm and a numerical aperture NA of 0.15 is used for the coupling to achieve an output of 23.8W and an efficiency of more than 78% of optical fiber coupling to meet the requirements of the fiber laser diode-coupled semiconductor laser pumping module.