Fig. 1 : Key performance criteria of DUV NLO crystals and related materials.
From: Deep-ultraviolet nonlinear optical crystals: concept development and materials discovery

Screening scheme of DUV NLO crystal candidates (a), key criteria coordinates (I, II, III), and corresponding structures of “pseudo” (b), “possible” (c), and “promising” (d) DUV NLO crystals