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Laser beam focusing through a moderately scattering medium using a bimorph mirror
Optics Express
|December 31, 2020
Summary
Researchers improved laser beam focusing through scattering media like fog using a bimorph deformable mirror. This technique enhanced focal spot brightness by up to 60% for better optical radiation transmission.
Area of Science:
- Optics and Photonics
- Laser Physics
- Scattering Media
Background:
- Optical radiation propagation through scattering media is challenging.
- Weakly scattering media, like fog, present unique optical challenges.
- Effective laser beam focusing is crucial for applications in scattering environments.
Purpose of the Study:
- To investigate laser beam focusing through weakly scattering media.
- To demonstrate the effectiveness of a bimorph deformable mirror for optimizing focal spots.
- To compare different optimization algorithms for beam focusing.
Main Methods:
- Investigated a 5 mm-thick layer of polystyrene microbead suspension.
- Utilized a wide aperture bimorph deformable mirror with 48 electrodes.
- Employed Shack-Hartmann sensor and CCD for focal spot analysis.
- Compared focal position optimization with peak brightness/diameter optimization algorithms.
Main Results:
- Achieved up to 60% increase in far-field focal spot peak brightness.
- Demonstrated successful beam focusing through scattering media (10^5 to 10^6 mm^-3).
- Showcased the novel application of a bimorph deformable mirror for scattering compensation.
Conclusions:
- Bimorph deformable mirrors can significantly improve laser beam focusing in scattering media.
- Optimization algorithms focusing on peak brightness are effective for this application.
- This method offers enhanced optical radiation transmission through challenging environments.
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