We changed from OpenGL to Direct3D which reduces possible issues with graphics card drivers. Especially if SLM devices are used e.g. with laptops with internal itel graphics cards and an additional graphics card it is now possible to select the graphics card which should be used for the rendering process.
Due to the fabrication process, the backplane of Liquid Crystal on Silicon displays is not perfectly flat. This can introduce aberrations to a light beam and influence efficiency and wave front quality. Due to the nature of a 2D phase only SLMs, the device is able to compensate its own flatness imperfection by addressing a compensation function.
We therefore characterize the wavefront error of each individual LCOS display with high accuracy and generate a corresponding compensation function. Wavefront compensation files (*.h5 file) are avaiable for LCOS SLM devices shipped after March 2021, containing an optical path difference field of the deformation.
This wavefront compensation file can be loaded as background compensation using the Pattern Generator software 5.1.