With the increasing output power of the monolithic fiber laser oscillators, the stimulated Raman scattering （SRS） effect becomes one of the main limitations of power scaling. Employing fiber with a larger mode area ...With the increasing output power of the monolithic fiber laser oscillators, the stimulated Raman scattering （SRS） effect becomes one of the main limitations of power scaling. Employing fiber with a larger mode area is an effective technique to mitigate the SRS, but, for the monolithic fiber laser oscillators, the difficulty of the inscription of the high-reflection fiber Bragg gratings （FBGs） increases with the fiber mode area. In this work, we demonstrated a high-power monolithic fiber laser oscillator based on the home-made large mode area FBGs and ytterbium-doped fiber （YDF） with 25 μm core diameters. A maximum output power of 4.05 kW is achieved at the central wavelength of -1080 ？nm with a total 915 nm pump power of -6.7 kW. At the operation of 4.05 kW, the intensity of the Raman Stokes light is -25 dB below the signal laser, and the beam quality （M2-factor） is -2.2. To the best of our knowledge, this is the first detailed report of the monolithic fiber laser oscillator with an output power beyond 4 kW.展开更多
Ⅰ. In the past fewer years, Chinese big bus manufacturers have been experiencing a hard time with the decline in terms of production and sales. According to the statistics from AIB of MMI, the production and sales vo...Ⅰ. In the past fewer years, Chinese big bus manufacturers have been experiencing a hard time with the decline in terms of production and sales. According to the statistics from AIB of MMI, the production and sales volume of 15 main Chinese manufacturers reached 1968展开更多
基金supported by the National Key R&D Program of China (No. 2016YFB0402204)the National Natural Science Foundation of China (Nos. 61735007, 61377062, and 61505260)
文摘With the increasing output power of the monolithic fiber laser oscillators, the stimulated Raman scattering （SRS） effect becomes one of the main limitations of power scaling. Employing fiber with a larger mode area is an effective technique to mitigate the SRS, but, for the monolithic fiber laser oscillators, the difficulty of the inscription of the high-reflection fiber Bragg gratings （FBGs） increases with the fiber mode area. In this work, we demonstrated a high-power monolithic fiber laser oscillator based on the home-made large mode area FBGs and ytterbium-doped fiber （YDF） with 25 μm core diameters. A maximum output power of 4.05 kW is achieved at the central wavelength of -1080 ？nm with a total 915 nm pump power of -6.7 kW. At the operation of 4.05 kW, the intensity of the Raman Stokes light is -25 dB below the signal laser, and the beam quality （M2-factor） is -2.2. To the best of our knowledge, this is the first detailed report of the monolithic fiber laser oscillator with an output power beyond 4 kW.
文摘Ⅰ. In the past fewer years, Chinese big bus manufacturers have been experiencing a hard time with the decline in terms of production and sales. According to the statistics from AIB of MMI, the production and sales volume of 15 main Chinese manufacturers reached 1968
