研究目的
Investigating the feasibility of Raman based power combining and wavelength conversion for more than two pump inputs and with varying wavelength separation.
研究成果
The results demonstrate that Raman based power combining and wavelength conversion can be achieved with more than two pump inputs and with wavelength separation varying from 5nm to 29nm. This suggests that RPC can be achieved with a multitude of Yb-lasers operating at arbitrary wavelengths, expanding the potential applications of this technique.
研究不足
The study does not address the maximum number of pump inputs that can be effectively combined or the upper limit on wavelength separation for successful RPC.
1：Experimental Design and Method Selection:
The experiment utilized cascaded Raman fiber lasers (CRFLs) based on random distributed feedback (RDFB) for high-power fiber lasers. The method involved using multiple low-power pump sources instead of a single high-power pump laser for power scaling.
2：Sample Selection and Data Sources:
Three independent Yb lasers operating at 1074nm, 1079-1088nm in tunable configuration, and 1117nm were used as pump sources.
3：List of Experimental Equipment and Materials:
A specialty Raman filter fiber of length ~350m was used, which terminates the Raman conversion at
4：5μm wavelength band. Experimental Procedures and Operational Workflow:
The pump lasers were combined via a wavelength division multiplexer (WDM) and fed into the Raman power combining (RPC) stage. The output spectrum at the
5：5μm band was analyzed. Data Analysis Methods:
The normalized input pump spectrum and the power combined spectrum at the 1.5μm band were compared to evaluate the effectiveness of RPC.
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