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Found 4 essays matching the above criteria.

  1. 1. Focal Spot Optimization Using Spatial Light Modulation and a Phase Retrieval Algorithm

    University essay from Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

    Author : Robert Petersen; [2023]
    Keywords : Spatial Light Modulation; Phase Retrieval Algorithm; Focal Spot Optimization; Adaptive Optics; Wavefront Sensing; Lasers; Physics and Astronomy; Technology and Engineering;

    Abstract : Aberrations to the wavefront of a laser beam reduce the quality of the focal spot and are generally undesired. This project is aimed at determining the aberrations of laser beams by using a phase retrieval algorithm and to show that it is possible to correct the aberrations with a spatial light modulator to optimize the focal spot. READ MORE

  3. 2. Wavefront Sensor with Astigmatism Correction for Measurements on the Human Eye

    University essay from KTH/Skolan för teknikvetenskap (SCI)

    Author : Mei-Li Holmberg; Linnea Johansson; [2017]
    Keywords : ;

    Abstract : When conducting experiments on the human eye it is sometimes required to correct some form of astigmatism. A fexible and cost effective way to achieve this is using two identical cross-cylinder lenses, as described in the article ‘Adaptive Astigmatism-Correcting Device for Eyepieces' by Arines and Acosta. READ MORE

  4. 3. Implementation of adaptive optics into a femtosecond laser chain

    University essay from Lunds universitet/Fysiska institutionen

    Author : Sandhra-Mirella Valdma; [2015]
    Keywords : wavefornt correction; deformable mirror; femtosecond laser; wavefront sensor; shack-hartmann; adaptive optics; Physics and Astronomy;

    Abstract : Optical aberrations are the main cause for reduced focusability and low peak intensity in laser beams. All the applications that rely on high peak power and/or small focus spot size, loose efficiency when optical aberrations are present. READ MORE

  5. 4. Evaluation of measurement data for an optical free-space aircraft to ground communication link system

    University essay from Blekinge Tekniska Högskola/Institutionen för tillämpad signalbehandling

    Author : Vevek Selvaraj; [2014]
    Keywords : Optical Free-space communication; Power Vectors; Shack-Hartmann wavefront Sensors and Finite State Space Markov Model.; Master of Science Programme in Electrical Engineering with emphasis on Signal Processing Masterprogram i Elektroteknik med inriktning mot signalbehandling;

    Abstract : Optical free-space communication is an e ffective approach that can provide tap-proof, high bandwidth data communications. In this thesis there is an Optical link established between aircraft and the ground station. READ MORE