研究目的
Investigating the development of a robust mode-locked femtosecond fiber laser based on a nonlinear optical mirror with all polarization-maintaining fibers for stable and self-starting operation.
研究成果
The developed laser demonstrates stable and self-starting operation with a 3-dB bandwidth of 25 nm and a repetition rate of 87.7 MHz, producing an ultrashort laser pulse of 100 fs. Its excellent stability and low relative intensity noise make it suitable for building an optical frequency comb.
研究不足
The relative intensity noise (RIN) of the laser is better than SESAM lasers but worse than NPR lasers, indicating potential areas for optimization in noise reduction.
1：Experimental Design and Method Selection:
The experiment involves designing a mode-locked femtosecond fiber laser using a nonlinear optical mirror with all polarization-maintaining fibers. The method includes exploiting an integrated nonreciprocal device biases π/2 phase shift for stable and self-starting operation.
2：Sample Selection and Data Sources:
The experiment uses a 0.5-m long Er-doped fiber as the gain media, pumped by a 976-nm laser diode.
3：5-m long Er-doped fiber as the gain media, pumped by a 976-nm laser diode.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes a 976-nm laser diode, Er-doped fiber, wavelength division multiplexer (WDM), polarization beam splitter (PBS), and a high reflection mirror.
4：Experimental Procedures and Operational Workflow:
The laser pulse is introduced into the nonlinear amplifying loop mirror (NALM) by one port of the coupler, split into two beams transmitted in opposite directions, and interfered to form a femtosecond pulse.
5：Data Analysis Methods:
The optical spectrum, RF spectrum, and relative intensity noise (RIN) are measured to evaluate the laser's performance.
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