研究目的
Investigating the efficiency and power scaling of a monolithic high power random fiber laser based on a tandem-pumping scheme.
研究成果
The paper concludes that a monolithic high power random fiber laser based on a tandem-pumping scheme can achieve an output power of 4020 W with an optical-to-optical efficiency of 88.5%. The RFL seed demonstrated better control over spectral broadening compared to a FBGs seed, making it advantageous for high power applications.
研究不足
The study notes spectral broadening when the output power exceeded 1.5 kW, attributed to nonlinear effects such as self-phase modulation and cross-phase modulation. The length of the gain fiber also led to residual pump laser and second Raman laser in the output spectrum.
1：Experimental Design and Method Selection:
The study adopted a master-oscillator-power-amplification (MOPA) structure with a tandem-pumping scheme to scale the power of a random fiber laser (RFL).
2：Sample Selection and Data Sources:
The RFL seed was constructed in a half-open cavity, and the amplifier stages used specially designed Yb doped fibers.
3：List of Experimental Equipment and Materials:
Equipment included a 1018 nm YDFL as a pump source, a 30/250 μm Yb doped fiber as the gain fiber, and a Yokogawa AQ6370D Optical spectrum analyzer for spectrum measurement.
4：Experimental Procedures and Operational Workflow:
The RFL seed was amplified through two amplifier stages to achieve a high output power. The spectral evolution and beam quality were measured at different power levels.
5：Data Analysis Methods:
The output power and spectral width were analyzed to evaluate the efficiency and spectral broadening of the RFL.
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