研究目的
To demonstrate an all-fiber mode-locked laser emitting broadband-spectrum cylindrical vector mode pulse based on nonlinear polarization rotation and long-period fiber grating.
研究成果
The all-fiber mode-locked laser successfully generates broadband-spectrum cylindrical vector mode pulses with high mode purity and stability. This work demonstrates the potential for generating high-purity and ultra-fast cylindrical vector beams.
研究不足
The technical constraints include the complexity of manufacturing the LPFG and the need for precise alignment and tuning of the polarization controllers to achieve stable mode-locking. Potential areas for optimization include improving the conversion efficiency and spectral bandwidth of the mode converter.
1：Experimental Design and Method Selection:
The experiment utilizes a few-mode long-period fiber grating (LPFG) as a mode converter inside the cavity and a flat-end connector deposited with gold film as an output coupler. The mode-locked mechanism is achieved through nonlinear polarization rotation (NPR).
2：Sample Selection and Data Sources:
A 974 nm laser diode is used to pump 25 cm Ytterbium-doped fiber (YDF). The spectral properties are measured with an optical spectrum analyzer (OSA), and temporal characteristics are recorded by an oscilloscope and an autocorrelator.
3：List of Experimental Equipment and Materials:
Equipment includes a laser diode, YDF, wavelength division multiplexer (WDM), circulator, polarizer, polarization controllers (PCs), LPFG, flat-end connector with gold film, OSA, oscilloscope, autocorrelator, and CCD camera.
4：Experimental Procedures and Operational Workflow:
The laser setup involves pumping the YDF, using the LPFG for mode conversion, and employing NPR for mode-locking. The output is characterized for spectral width, pulse duration, and mode purity.
5：Data Analysis Methods:
The spectral and temporal data are analyzed to determine the laser's performance characteristics, including spectral width, pulse duration, and mode purity.
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