In modal holographic wavefront sensor (HWFS), the intensity of each spot in the image plane is traditionally measured by integrating over a small area centering on the pre-defined position. Movements of those spots either caused by input aberration or misalignment of optical system affect the measured intensity and reduce linearity of HWFS’s response curve. We proposed an improved detection method by using weighted average intensity within a larger window to reduce the dependency of HWFS’s response curve on the selection of detector size and position (under review for Applied Optics). We also made a HWFS on a hologram film using blue laser and used the proposed method to demonstrate its capability of detecting encoded aberration types. The HWFS was tested with a red laser and white LED later and shown to still work properly, even with radial shift or spectrum rainbow due to the wavelength change between recording and reconstruction light.
© 2016 Optical Society of AmericaPDF Article