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Single crystals of pure and Lanthanum added KDP crystals were grown from aqueous solution. The influence of La 3+ ions in KDP crystals is studied. Isolated centers are formed by La 3+ ions in KDP structure along (100) plane. La 3+ ions incorporated into superficial crystal growth layer and slightly affect the growth process as they generate weak lattice stresses. The creation of these weak lattice stress is confirmed by Vickers's micro hardness test. The HRXRD analysis showed reduced structural defects in the La added KDP in the (100) plane than pure KDP. The incorporation of La in the crystal was confirmed by EDAX analysis. The Kurtz's powder SHG efficiency was found to be 1.5 times that of pure KDP. The UV-Vis transmission spectra of La added KDP showed excellent transmittance from 1100 nm to 340 nm and did not show any change in lower cutoff wavelength with respect to pure KDP. Laser damage threshold value has been determined using Qswitched Nd:YAG laser operating at 1064 nm and with 65 ns pulses in single shot mode.

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