Abstract

The borate crystals are often used for laser radiation frequency conversion in visible and ultraviolet (UV) areas via sum-frequency generation (SFG) and near infrared (IR) band via different-frequency generation (DFG). In order to obtain the complete data for all possible frequency conversion processes the presentation was proposed in [1] in the form of diagram for figure of optical merit (FOM: FOM₂=(d_eff)²/(n₁n₂n₃)) with maximum values of the effective nonlinear coefficient d_eff along the phase matching directions for every combination of interacting wavelengths. It is also possible to use this diagram for finding interacting wavelengths combinations with noncritical angular and spectral phase matching.

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