Including Fresnel reflection losses in freeform lens design A.H. van Roosmalen, M.J.H. Anthonissen, W.L. IJzerman and J.H.M. ten Thije Boonkkamp EPJ Web Conf., 266 (2022) 02008 Published online: 13 October 2022 DOI: 10.1051/epjconf/202226602008