Crystals are by definition is an anisotropic. The properties of them will change as the direction of measurement is change. Now as far as Nonlinear optical properties is to be concern the second and third order susceptibilities are directional as well as structure sensitive. It depends on the symmetry of your grown crystals.
Jaydeep H. Joshi Thank you so much for your descriptive answer. it's really helpful. I will be grateful if you please help me out with some literature for this calculation.