研究目的
Investigating the generation of cylindrical vector beams (CVBs) using a photonic lantern as a transverse mode converter and mode splitter in a linear-cavity continuous-wave fibre laser.
研究成果
The study successfully demonstrates a linear-cavity CW fibre laser generating CVBs with high purity (>96%) at a center wavelength of 1553.1 nm. The use of a photonic lantern and TM-FBG enhances the laser's performance, suggesting promising applications in optoelectronics.
研究不足
The study is limited by the specific setup and materials used, such as the photonic lantern's fabrication and the laser's operational wavelength. Potential optimizations could include exploring different materials or configurations for broader applications.
1：Experimental Design and Method Selection:
The study employs a linear-cavity CW fibre laser setup with a photonic lantern for CVB generation. The design includes a 980 nm laser diode, a WDM, EDF, a circulator, and a TM-FBG for bandwidth narrowing and mode discrimination.
2：Sample Selection and Data Sources:
The photonic lantern is fabricated by placing three single fibers into a capillary tube, which is then adiabatically tapered and spliced into a multiple mode fibre.
3：List of Experimental Equipment and Materials:
Includes a 980 nm laser diode, WDM, EDF, circulator, TM-FBG, photonic lantern, polarization controllers, spectrum analyzer (YOKOGAWA, AQ6370C), and CCD camera.
4：Experimental Procedures and Operational Workflow:
The setup involves optimizing the output spectrum and controlling CVB generation with PCs, measuring spectral characteristics with an OSA, and capturing beam profiles with a CCD camera.
5：Data Analysis Methods:
The purity of polarized beams is estimated using a fibre bending method, calculating the percentage bending loss.
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spectrum analyzer
AQ6370C
YOKOGAWA
Measuring the spectral characteristics of the laser
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laser diode
Pumping laser source
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wavelength division multiplexer
Multiplexing and demultiplexing wavelengths
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Erbium-doped fibre
Amplifying the optical signal
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circulator
Acting as a cavity mirror
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two-mode fibre grating
TM-FBG
Narrowing the bandwidth of the laser and discriminating mode
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photonic lantern
Transverse mode converter and mode splitter
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polarization controllers
PC1, PC2, PC3
Optimizing output spectrum and controlling CVB generation
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CCD camera
Capturing output beam profiles
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