研究目的
To demonstrate an all few-mode fiber laser capable of multi-wavelength oscillation and switchable transverse modes based on the polarization dependence of the fiber Bragg grating.
研究成果
The demonstrated all few-mode fiber laser successfully achieves multi-wavelength oscillation and switchable transverse modes, including the generation of cylindrical vector beams. This innovation holds potential for applications in WDM systems, MDM systems, and sensing.
研究不足
The study is limited by the sensitivity of the fiber Bragg gratings to polarization states and the complexity of achieving precise control over the laser's operating states.
1：Experimental Design and Method Selection:
The experiment utilizes the polarization dependence of fiber Bragg gratings (FBGs) to achieve multi-wavelength oscillation and switchable transverse modes in a fiber laser.
2：Sample Selection and Data Sources:
The setup includes a pair of few-mode fiber Bragg gratings (FMFBGs), Yb-doped fiber (YDF), and polarization controllers (PCs).
3：List of Experimental Equipment and Materials:
Equipment includes a 974 nm laser diode (LD), wavelength division multiplexer (WDM), optical spectrum analyzer (OSA, YOKOGAWA AQ6373B), and CCD camera.
4：Experimental Procedures and Operational Workflow:
The laser's operating state is adjusted by manipulating the polarization controllers to achieve different wavelengths and transverse modes.
5：Data Analysis Methods:
Output spectra and beam profiles are analyzed using the OSA and CCD camera, respectively.
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Yb-doped fiber
DCF-YB-9/128-FA
Coractive
Used as the gain medium in the fiber laser
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optical spectrum analyzer
AQ6373B
YOKOGAWA
Measuring the transmission spectra of the FBGs
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laser diode
Pumping the Yb-doped fiber
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wavelength division multiplexer
Coupling the pump light into the fiber laser
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