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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
Multiple mode conversion and beam shaping with superimposed long period gratings.
1OFS Laboratories, 19 Schoolhouse Road, Somerset, NJ 08873, USA. sumetski@ofsoptics.com
Optics Express
|June 4, 2008
Summary
Superimposed long period gratings (SLPG) enable efficient conversion between multiple optical fiber modes and a single mode. These devices act as all-fiber mode focusers and beam shapers for advanced photonic applications.
Area of Science:
- Photonics and Optical Engineering
- Fiber Optics Technology
- Waveguide Devices
Background:
- Controlling and manipulating light within optical fibers is crucial for advanced applications.
- Converting between multi-mode and single-mode fiber propagation is a key challenge.
Purpose of the Study:
- To demonstrate the use of superimposed long period gratings (SLPG) for optical fiber mode conversion.
- To explore SLPGs for beam shaping and focusing applications.
Main Methods:
- Theoretical analysis of SLPGs composed of multiple gratings.
- Optimization of SLPG parameters to control output beam characteristics.
- Calculation of refractive index profiles for specific fiber types (SMF-28).
Main Results:
- Successfully demonstrated conversion between arbitrary optical fiber modes and a single mode using SLPGs.
- Optimized SLPGs to focus light beams at specific distances (0.5 mm and 1 mm).
- Achieved a uniform beam amplitude within a 4° angle with +/-0.2% accuracy.
Conclusions:
- SLPGs offer an efficient all-fiber solution for mode conversion.
- Proposed SLPG devices function effectively as mode focusers and beam shapers.
- This technology has potential applications in advanced optical systems.
