研究目的
Investigating the self-Q-switched operation of a linear cavity fiber laser based on a homemade Er/Yb double clad fiber as gain medium and the impact of active fiber length on the characteristics of self-Q-switched pulses.
研究成果
The study demonstrates stable self-Q-switched operation in a linear cavity fiber laser using a homemade Er/Yb double clad fiber. Longer fiber lengths provide better performance in terms of repetition rate, pulse duration, and peak power. The laser also achieves dual-wavelength and switchable single-wavelength operations using a PM-FBG as a spectral filter.
研究不足
The study is limited by the range of pump powers and fiber lengths tested. The self-Q-switched operation is significantly diminished when the fiber length is shortened to 2 m, and the pump power range for stable operation is narrowed.
1：Experimental Design and Method Selection:
The study employs a linear cavity fiber laser setup with a homemade Er/Yb double clad fiber as the gain medium. A polarization maintaining fiber Bragg grating (PM-FBG) is used as a spectral filter to achieve dual-wavelength and switchable single-wavelength operations.
2：Sample Selection and Data Sources:
The experiment uses different lengths of Er/Yb double clad fiber (2, 3, and 4 m) to study the effect of fiber length on the self-Q-switched operation.
3：List of Experimental Equipment and Materials:
The setup includes a multimode high-power laser source at 976 nm, a beam combiner, a polarization controller, a PM-FBG, an Optical Spectrum Analyzer (OSA, Yokogawa AQ6375), a photodetector (Thorlabs, Photodetector 1.2 GHz InGaAs), and an oscilloscope (Tektronix, DPO4104B).
4：2 GHz InGaAs), and an oscilloscope (Tektronix, DPO4104B).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser output is measured at different pump powers and fiber lengths to analyze the characteristics of self-Q-switched pulses, including repetition rate, pulse duration, and peak power.
5：Data Analysis Methods:
The data collected from the OSA and oscilloscope are analyzed to determine the performance metrics of the self-Q-switched laser operation.
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