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Analysis and simulation of a fiber bundle method for creating a partially spatially coherent beam
1Klipsch School of Electrical and Computer Engineering, New Mexico State University, Las Cruces, New Mexico 88003, USA.
Applied Optics
|August 14, 2013
Summary
A fiber bundle with varied fiber lengths can create a partially spatially coherent beam from temporally incoherent light. This method smooths the far-field pattern, matching a single fiber
Area of Science:
- Optics and Photonics
- Fiber Optics
- Beam Coherence
Background:
- Partially spatially coherent beams are crucial for various optical applications.
- Existing methods for generating such beams can be complex or limited.
- Fiber bundles offer a potential alternative for beam shaping.
Purpose of the Study:
- To investigate a fiber bundle arrangement for producing partially spatially coherent beams.
- To develop theoretical expressions for the optical properties of the fiber bundle.
- To simulate and analyze the far-field irradiance pattern generated by the fiber bundle.
Main Methods:
- Theoretical development of expressions for autocorrelation function and far-field irradiance.
- Numerical simulations of light propagation through a fiber bundle with distributed fiber lengths.
- Comparison of simulated results with speckle-free conditions.
Main Results:
- The fiber bundle approach successfully translates limited temporal coherence into limited spatial coherence.
- The average shape of the generated irradiance pattern approximates that of a single fiber.
- A "smoothed" far-field pattern is achieved when fiber length differences exceed the source temporal coherence length.
Conclusions:
- Fiber bundles with distributed fiber lengths provide a viable method for generating partially spatially coherent beams.
- The technique offers a way to control spatial coherence and smooth far-field patterns.
- This approach has implications for applications requiring tailored beam properties.
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