Wavefront Measurement

  • Characterization of lasers and optics
  • Complete reconstruction of the wavefront

A wavefront for propagating light waves exists where all the component waves have the same phase. Simple wavefronts are e.g. a plane or a spherical wavefront. If a light wave is reflected by or transmitted through a non-ideal optical element, the wavefront changes as well.The wavefront monitor helps in the measurement and analysis of this phase.

Description and Mode of Operation

Our wavefront sensors work according to the Shack-Hartmann principle and allow the user to characterize lasers and optics. Wavefronts, MTF, PSF, Zernike polynomials as well as the laser's near and far fields can be measured simultaneously.

When a light wavefront hits an array of lenses, the wavefront is split into partial beams. The individual partial wavefronts are then focused by the lenses of the array of lenses. The array of lenses is positioned at its focal distance in front of the CCD sensor. The CCD sensor detects the position and the intensity of the focused beams. Wavefront aberrations lead to lateral shifts of the focal points.

The complete wavefront can be reconstructed from a mathematical assembly of all the lateral shifts. This assembled wavefront can be described using e.g. the coefficients of the Zernike polynomials.