Essays about: "beam shaping"

Found 5 essays containing the words beam shaping.

1. 1. Far-field pattern synthesis of transmitarray antennas using convex optimization techniques

   University essay from KTH/Tillämpad fysik

   Author : Marie Defives; [2022]
   Keywords : Applied physics; Transmitarray antennas; convex optimization; Tillämpad fysik; Transmitarray-antenner; konvex optimering;

   Abstract : Transmitarrays antennas (TAs) can be seen as the planar counterpart of optical lenses. They are composed of thin radiating elements (unit cells) which introduce different local phase shifts on an incident electromagnetic wave, emitted by a primary source, and re-radiate it. READ MORE

3. 2. Manipulation and application of laser light using spatial light modulation

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

   Author : Albin Hedse; [2020]
   Keywords : spatial light modulation; wavefront correction; high harmonic generation; harmonic divergence; Physics and Astronomy;

   Abstract : Attosecond pulses obtained via high harmonic generation often suffer from chromatic aberration. This is inherent from the generation process as a consequence of the spatial profile of the driving laser pulses. READ MORE

4. 3. Investigating Gas Turbulence in Galactic Discs

   University essay from Lunds universitet/Astronomi - Genomgår omorganisation

   Author : Timmy Ejdetjärn; [2019]
   Keywords : galaxies; gas; turbulence; interstellar medium; star formation; feedback; gravitational instability; local; high redshift; Physics and Astronomy;

   Abstract : The interstellar medium of both local and distant disc galaxies is observed to be supersonically turbulent and the turbulent motion of the gas is thought to be important for galaxy formation and evolution, particularly as a key ingredient for star formation. Consequently, this generates a striking relation between the star formation rate (SFR) and gas velocity dispersion ($\sigma_{\rm g}$; a measurement on the level of turbulence). READ MORE

5. 4. Intensity distribution conversion from Gaussian to Top-Hat in a single-mode fiber connector

   University essay from Lunds universitet/Atomfysik

   Author : Ola Willstrand; [2013]
   Keywords : Gaussian beam; top-hat; fiber connector; Powell lens; FRED; ZEMAX; Physics and Astronomy;

   Abstract : Gaussian to top-hat beam shaping is widely used today in areas of cutting, welding, and laser patterning. Typically, single-mode solid state lasers are used whose Gaussian intensity distribution is transformed into a top-hat. READ MORE

6. 5. Approximation of Antenna Patterns With Gaussian Beams in Wave Propagation Models.

   University essay from Institutionen för datavetenskap, fysik och matematik, DFM

   Author : Navid Sherkat; [2011]
   Keywords : Gaussian beam; Pattern synthesis; Point matching; Wave propagation models;

   Abstract : The topic of antenna pattern synthesis, in the context of beam shaping, is considered. One approach to this problem is to use the method of point matching. This method can be used to approximate antenna patterns with a set of uniformly spaced sources with suitable directivities. READ MORE