研究目的
To propose a new method for an all-fiberized top-hat beam shaper based on controlling mode content and suppressing multimode interference, for converting Gaussian-beam profile to top-hat beam profile.
研究成果
The proposed all-fiberized beam shaper successfully converts Gaussian beams to top-hat beams by controlling mode content and suppressing multimode interference, with a flatness factor of about 0.6. Theoretical simulations agree well with experimental results, and the method shows potential for other beam profile transformations with low length-sensitivity.
研究不足
The tolerance for core misalignment in the splice process is about ±1μm, and fiber bending or alignment mismatch can affect the flatness factor. The device may have limitations in repeatability due to fabrication sensitivities.
1：Experimental Design and Method Selection:
A 2D simulation model using beam propagation method in RSoft BeamPROP module was developed to calculate mode content and output intensity profile. The beam shaper was fabricated by fusion splicing a tapered multimode fiber to a single-mode fiber, with taper ratio and shape optimized based on simulations.
2：Sample Selection and Data Sources:
Samples were fabricated with taper ratios from
3：4 to 6 in steps of A single-mode laser diode at 1064 nm wavelength with PM980 pigtail fiber was used as the signal source. List of Experimental Equipment and Materials:
Equipment includes a fused biconical technique setup for fabrication, a mode field adapter with 20/400
4：06/46NA pigtail, an infrared CCD camera (Spiricon Pyrocam IV), and fibers (20/400 06/46NA single-mode fiber and 50/400 2NA multimode fiber from Nufern and Coractive). Experimental Procedures and Operational Workflow:
The beam shaper was fabricated by tapering the multimode fiber to specific ratios, splicing it to the single-mode fiber with electrode offset to maintain transmission. Output beam profiles were recorded by cutting the fiber pigtail in steps and observing with the CCD camera.
5：Data Analysis Methods:
The flatness factor was calculated as the ratio of clip-level average power density to maximum power density, with clip-level set to 10% of maximum. Mode content and intensity distributions were analyzed from simulation and experimental data.
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