Fig. 6(b) shows the DC recorded for a typical specimen grown under the same conditions as that of Fig. 6(a) but with an condition of seed rotation during growth experimental additional by the optimum rotation (40 rpm) of the seed crystal. The curve is (FwHM) extremely sharp having the full-wave at half-maximum of 2.7 arcsec as expected for a perfect crystal according to the plane wave dynamical theory of XRD 128]. Absence of additional perfection peaks and the very sharp DC shows that the crystalline of the specimen crystal is extremely good. This clearly shows that the specimen does not contain any complex structure, which is otherwise observed when there is no seed rotation (Fig. 6(a)). The 80%) and the very small value of FWHM high reflectivity indicate that even the unavoidable point defects like interstitials d vacancy defects 125l are also extremely low. This comparative KDP crystals with and without seed study of K2Co3-doped rotation reveals that the seed rotation helps to a significant the crystalline perfection. It seems that due to extent in impurities and seed rotation, the complex layers containing dopants are not allowed to stay on the surface of the growing crystal due to centripetal force and also helps to interface saturated solution at the liquid-solid homogeneous and thereby the crystal grown under seed rotation condition has perfection as evident from the very crystalline got an excellent sharp and single DC of Fig 6(b)