Essays about: "wavefront sensor"

Found 5 essays containing the words wavefront sensor.

  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. Design of a compact wavefront sensor for measurements on the human eye

    University essay from KTH/Tillämpad fysik

    Author : Charlie Börjeson; [2020]
    Keywords : Applied physics; optical physics; visual optics; Tillämpad fysik; optisk fysik; visuell optik;

    Abstract : Wavefront sensors for measurements on human eyes are usually large, expensive and difficult to move. A compact wavefront sensor would be more cost-effective and versatile as is could be used in multiple systems. The aim of this thesis was to produce a more compact and portable wavefront sensor. READ MORE

  4. 3. 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

  5. 4. 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

  6. 5. Controlling the Secondary Mirror Cell of the Euro50 Project using an Inertial Measurement Unit

    University essay from Lunds universitet/Institutionen för reglerteknik

    Author : Olof Sandberg; [2005]
    Keywords : Technology and Engineering;

    Abstract : When building a telescope, importance does not only lie on the optical performance. Keeping the entire structure stable is also of great importance. In the case of the Euro50, the secondary mirror cell will be located some 60 m above ground level, exposed of wind speeds up to 15 m/s. READ MORE