Glick Yaakov, Shamir Yariv, Wolf Alexey A, Dostovalov Alexandr V, Babin Sergey A, Pearl Shaul
Opt Lett. 2018 Mar 1;43(5):1027-1030. doi: 10.1364/OL.43.001027.
We report for the first time, to the best of our knowledge, an all-fiber Raman graded-index (GRIN) fiber laser pumped by a fiber laser. This configuration points to potential future power and brightness increases. Continuous-wave power of 135 W with an M value of 2.5 was obtained at a wavelength of 1081 nm with an optical-to-optical efficiency of 68%. A commercial GRIN core fiber acts as the Raman fiber in a power oscillator configuration that includes fiber Bragg gratings (FBGs) written onto the GRIN fiber. The efficiency and brightness demonstrated here are, to the best of our knowledge, the highest reported in any Raman GRIN fiber laser. A brightness enhancement of the pump beam by a factor of 5.6 is attained due to the transverse profiles of Raman gain and FBG reflection in the GRIN fiber.
据我们所知，我们首次报道了一种由光纤激光器泵浦的全光纤拉曼渐变折射率（GRIN）光纤激光器。这种配置预示着未来功率和亮度有望提高。在波长为1081nm时，获得了135W的连续波功率，M值为2.5，光光效率为68%。一种商用GRIN纤芯光纤在功率振荡器配置中充当拉曼光纤，该配置包括写入GRIN光纤的光纤布拉格光栅（FBG）。据我们所知，此处展示的效率和亮度是所有拉曼GRIN光纤激光器中报道的最高值。由于GRIN光纤中拉曼增益和FBG反射的横向分布，泵浦光束的亮度提高了5.6倍。
