Publications G. Khan, K. Mantel, I. Harder, N. Lindlein, J. Schwider, Design considerations for the absolute testing approach of aspherics using combined diffractive optical elements, Appl. Opt., 46, 7040-7048, (2007)

F. Simon, G. Khan, K. Mantel, N. Lindlein, J. Schwider, Quasi-absolute measurements of aspheres with a combined-diffractive optical element as reference, Appl. Opt., 45, 8606-8612, (2006)