TY - JOUR AU - Spychala, K. J. AU - Mackwitz, P. AU - Widhalm, A. AU - Berth, G. AU - Zrenner, A. ID - 22053 JF - Journal of Applied Physics SN - 0021-8979 TI - Spatially resolved light field analysis of the second-harmonic signal of χ(2)-materials in the tight focusing regime ER -