| Abstract [eng] |
Photonic crystals can be used to control the propagation of light. If certain conditions are met, they are selective directionally and can, therefore, be used as spatial filters for laser beams. These filters are characterized by a translational invariance and the fact that they do not require sharp beam focusing. Directional selectivity is achieved in Laue (diffraction) or Bragg (photonic stopgap) geometric modes. The geometry and fabrication methods of photonic crystals operating Laue mode have been improved, and filtering demonstrated for the first time in Bragg mode. This was achieved through the application of new numerical modeling and fabrication techniques. During testing of the resulting photonic crystal spatial filters in laser resonators, useful filtration was observed, characterized by higher quality and brightness of the laser beam. Two cases have been for a microchip and an external cavity semiconductor laser. |
