研究目的
Investigating the generation of high purity cylindrical vector beams (CVBs) using few-mode fiber (FMF) based devices and an all-FMF mode-locked ring laser with carbon nanotubes.
研究成果
The study successfully demonstrates an all-FMF ring laser generating mode-locked pulses with high purity cylindrical vector beam (CVB) emission. The laser achieves a spectral bandwidth of 0.33 nm, a repetition rate of 30.58 MHz, and signal to noise ratio of 71.27dB. The purities of the azimuthally and radially polarized beams are measured to be 96.7% and 95.2%, respectively. This novel laser source has potential applications in mode-division multiplexing (WDM) for enhancing optical fiber communication capacity.
研究不足
The mode-locked state becomes unstable once the pump power exceeds 340mW, indicating a limitation in the operational power range for stable mode-locking.
1：Experimental Design and Method Selection:
The study involves the design of few-mode fiber (FMF) based devices and the demonstration of an all-FMF mode-locked ring laser with carbon nanotubes for generating cylindrical vector beams (CVBs).
2：Sample Selection and Data Sources:
The study uses a single-mode fiber (Nufern, 1060-XP) and a two mode fiber (OFS, step-index) for device fabrication. The performance of these devices is tested using various optical measurements.
3：List of Experimental Equipment and Materials:
Includes a wavelength-division multiplexing-wavelength-selection coupler (WDM-MSC), few-mode erbium-doped fiber (FM-EDF), carbon nanotube saturable absorber (CNT-SA), and other optical components like isolators, couplers, and collimators.
4：Experimental Procedures and Operational Workflow:
The process involves fabricating the WDM-MSC, testing the FM-EDF's ability to transmit and amplify high-order LP11 mode, and setting up an all-FMF ring laser cavity to generate mode-locked pulses and CVBs.
5：Data Analysis Methods:
The study analyzes the output beam profiles, gain spectra, pulse trains, and spectral bandwidths using CCD cameras, optical spectrum analyzers (OSA), and oscilloscopes.
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