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Updated: Jun 7, 2026
09:43
Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
Published on: March 20, 2017
Tomographic wavefront error using multi-LGS constellation sensed with Shack-Hartmann wavefront sensors.
Clélia Robert1, Jean-Marc Conan, Damien Gratadour
1Office National dÉtudes et de Recherches Aérospatiales, BP 72, 92322 Châtillon, France. clelia.robert@onera.fr
Summary
Laser guide star (LGS) elongation noise requires global analysis for accurate tomographic reconstruction. Edge launching offers comparable performance to central launching, mitigating fratricide scatter risks.
Area of Science:
- Adaptive optics
- Astronomical instrumentation
Background:
- Laser guide star (LGS) elongation introduces noise in tomographic reconstruction.
- Accurate performance estimation requires global analysis of multi-LGS systems.
Purpose of the Study:
- To analyze wavefront error from LGS elongation using Shack-Hartmann sensors.
- To compare different LGS launching options and their impact on performance.
Main Methods:
- Modal analysis of wavefront error.
- Quasi-analytical matrix formalism.
- Shack-Hartmann wavefront sensing.
Main Results:
- Edge launching shows similar performance to central launching, accounting for spot elongation and Rayleigh fratricide.
- Optimized centroid estimators slightly improve performance.
- Field-of-view truncation has minimal impact.
Conclusions:
- Global analysis of LGS elongation noise is crucial for tomographic reconstruction.
- Edge launching is a viable alternative to central launching.
- Detector characteristics are important for LGS Shack-Hartmann sensors.
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