Two-dimensional periodic and quasiperiodic spatial structures in   microchip laser resonator
  The spatially periodic 2D patterns at output mirror of solid state microchip laser with high Fresnel number (100-1000) are discussed in view of numerical modeling with split-step FFT code comprising nonlinear gain, relaxation of inversion and paraxial diffraction. 
A.Yu. Okulov
physics.optics