Shack-Hartmann wavefront sensors Our wavefront sensors measure optical elements, optical assemblies and lasers with high accuracy and precision. Test at DUV, VIS, NIR, SWIR, MWIR, LWIR wavelengths, on-axis and off-axis. Our wavefront sensors measure optical elements, optical assemblies and lasers with high accuracy and precision. Test at DUV, VIS, NIR, SWIR, MWIR, LWIR wavelengths, on-axis and off-axis.