Birefringence measurements on unidirectional ADP single crystals grown by SR method have been carried out. Pure ADP, slotted ampoule grown ADP, L-Asparagine monohydrate, ammonium chloride and nickel sulphate doped ADP crystals were selected for the measurements. It provides qualitative assessment of the uniformity of dislocation density inside the crystal. This technique is also used for precise determination of the birefringence along any preferred direction of the crystal. The uniformity of the fringes signifies that the grown crystals have good optical quality. The birefringence is practically zero, implying that the crystal plate is almost perpendicular to the optic axis direction. The birefringence value for < 0 0 1> direction of all crystals have been determined and these results are correlated with UV-Visible transmittance results.

Birefringence spectrum of (a) Slotted ampoule grown ADP (b) Pure ADP

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