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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Large-mode-area optical fiber for photonic nanojet generation
Optics Letters
|May 16, 2019
Summary
Large-mode-area (LMA) optical fibers enhance photonic nanojet (PNJ) generation for laser micro-machining. LMA fibers require significantly less energy, improving efficiency in PNJ applications.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Photonic nanojets (PNJs) generated by shaped optical fiber tips are promising for laser micro-machining.
- Multimode (MM) fibers are typically used, but higher-order modes do not contribute to PNJ generation, leading to energy inefficiency.
Purpose of the Study:
- To investigate the benefits of using a large-mode-area (LMA) optical fiber for PNJ generation.
- To compare the performance of an LMA fiber with a conventional MM fiber for laser micro-machining applications.
Main Methods:
- A homemade 40 μm mode field diameter LMA optical fiber was fabricated and shaped.
- The PNJ generation from the LMA fiber was compared to a 100/140 μm MM-shaped fiber tip.
- Energy efficiency and micro-peak characteristics were evaluated.
Main Results:
- Similar micro-peak structures were achieved with both LMA and MM fibers.
- The LMA fiber demonstrated a significant energy gain, requiring eight times less coupled energy.
- This indicates improved energy utilization in PNJ generation.
Conclusions:
- Large-mode-area optical fibers offer an advantage for photonic nanojet generation.
- The enhanced energy efficiency of LMA fibers opens new possibilities for laser micro- and nano-processing.
- This research contributes to more efficient laser-based fabrication techniques.
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