研究目的
To demonstrate a high-power (~50 W) Raman laser with direct generation of Stokes radiation at 976 nm, achieving high beam quality and efficiency from a multimode laser diode pump.
研究成果
The study successfully demonstrated a high-power Raman laser at 976 nm with excellent beam quality and high efficiency, making it promising for applications such as pumping fiber lasers and amplifiers. Future work could focus on further increasing the output power and optimizing the beam quality.
研究不足
The study is limited by the beam quality of the pump diodes and the potential for further optimization of the FBGs to improve beam quality and power output.
1：Experimental Design and Method Selection:
The experiment utilized a 100/140 multimode graded-index fiber with in-fiber Bragg gratings to form a cavity for Raman generation. The pump was provided by three high-power multimode laser diodes at ~938 nm.
2：Sample Selection and Data Sources:
The fiber line was 1 km long, and the output was measured for power, beam quality, and spectral characteristics.
3：List of Experimental Equipment and Materials:
Equipment included multimode LDs, a 3 × 1 pump combiner, GRIN fiber, FBGs, dichroic mirrors, power meters, an optical spectrum analyzer, and a Thorlabs M2-measurement system.
4：Experimental Procedures and Operational Workflow:
Pump radiation was coupled into the GRIN fiber, and the output was analyzed for Stokes generation at 976 nm, including measurements of power, beam quality, and spectrum.
5：Data Analysis Methods:
The output power and beam quality were measured as functions of input pump power, and spectral analysis was performed to characterize the Stokes generation.
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