Quality and reliability of our Shack-Hartmann wavefront sensors 

Factors important for accuracy in our Shack-Hartmann sensors

  • Focal length of lenslet array : in our instruments we use long focal length for the Shack-Hartmann lenslet array (22 mm or 41 mm). Why a long focal length lenslet array is so important?
  • Centroiding: very sophisticated algorithm tuned on our lenslet arrays. It also akes into account for local non-uniform illumination
  • Combination of reference and test spots: our proprietary algorithm is very reliable and works in presence of very high aberrations
  • Choice among 4 set of polynomials to fit to data: Annular, Standard and Fringe Zernikes and Seidel polynomials. Annular Zernikes are required when analyzing astronomical telescopes
  • 70 Zernike terms: low order and higher order aberration terms for Spherical aberrations, Astigmatism, Coma etc.
  • Wavefront reconstruction: independent from the Zernike aberrations, very sophisticated algorithm for integration from residuals