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- W2025797793 abstract "We present the results of reduction of laser beam geometrical fluctuations that we have experimentally measured using aprototype of Adaptive Optics (AO) system previously designed. The scheme of this prototype provides that thewavefront sensing function is not operated by a Shack Hartmann sensor as usual, but it is based on an interferometrictechnique which allows to detect the perturbed phase profile using the interference fringes pattern. We show that thistechnique is of particular interest when high sensitivity and large bandwidth are required for the correction of smallperturbations. The architecture of the system is based on a typical Michelson configuration with He-Ne laser source. It isassumed that one arm of the interferometer is passed through by the reference beam while in the other one there is theaberrated wave. The output intensity produces a fringe pattern which is detected by means of a pixellated photodiode.Combining the output of each photodiode, we achieve signals which can be immediately interpreted as aberrationcoefficients and thus reintroduced into the digital control as error signals in order to calculate the correction commandsto be sent to the deformable mirror. The results here presented show that we have obtained 2 decades of noise reductionin the 10 Hz bandwidth, and that the control has been operating 10 dB attenuation up to 200 Hz." @default.
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- W2025797793 date "2008-10-02" @default.
- W2025797793 modified "2023-09-23" @default.
- W2025797793 title "Adaptive optics system prototype for the automatic control of geometrical fluctuations in a laser beam in air" @default.
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- W2025797793 doi "https://doi.org/10.1117/12.800432" @default.
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