Recently, the research team led by Feng Yan, a researcher at the Space Laser Information Technology Research Center of the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, has made new progress in the research of high-power Raman fiber lasers. A 镱-Raman integrated fiber amplifier structure is proposed, which effectively solves the main technical bottleneck problem of Raman fiber laser power boost. For the first time at 1120nm wavelength, 580W single transverse mode linear polarization Raman fiber laser and 1.3kW are obtained. Near-unimode Raman fiber laser output.
In recent years, high-power fiber lasers have developed rapidly. The 1μm band erbium-doped fiber laser has a near diffraction limit output power of up to 20kW and a multi-transverse mode output power of up to 100kW. Nevertheless, the output wavelength of rare earth doped fiber lasers can only cover a limited spectral range due to the limitation of the energy level transition of rare earth ions, which limits its application fields. Raman fiber lasers based on the stimulated Raman scattering effect in optical fibers are effective means to extend the wavelength range of fiber lasers.
In this study, two or more wavelengths of seed lasers were injected into a typical high-power erbium-doped fiber amplifier, and the wavelength spacing corresponds to the Raman frequency shift of the fiber. The seed laser at the center of the helium ion gain bandwidth is first amplified, and the Raman Stokes laser is stepwise amplified as a pump laser in the subsequent fiber. A preliminary demonstration experiment obtained a 300 W 1120 nm Raman fiber laser output; then a larger cladding (400 μm) fiber was used to obtain a 580 W single transverse mode linearly polarized Raman fiber laser and a 1.3 kW near single mode Raman. Fiber laser output. The results were published in "Optics Letters" and "Optics Express" [Opt. Lett. 39, 1933-1936 (2014); Opt. Express 22, 18483 (2014)]. In view of the fact that the current high-power erbium-doped fiber lasers adopt a main-vibration amplification structure, the newly proposed fiber amplifier structure can be used to further increase the output power of the Raman fiber laser. Preliminary numerical calculations also show that the technical method is expected to obtain kilowatt-level laser output at any wavelength in the range of 1 to 2 μm.
The research was supported by the 100-member program of the Chinese Academy of Sciences, the National “863†Program, and the National Natural Science Foundation.
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