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Chapter VI UV-Vis Spectroscopic…. Table: 6.2 Optical transmission data of pure and different Amino acids doped KDP crystals. Samples Therefore, L-histidine and DL-methionine doping in the KDP crystals narrows down the window and decreases the cut off limit, while L-threonine doping in KDP keeps the cut off limit unaltered. The UV transparency cut-off frequency increases marginally on doping L-histidine in KDP crystals from 350 nm to 375 nm, for DL-methionine in KDP crystals from 350 nm to 385 nm and for L-threonine doped KDP crystals almost remaining the same around 350 nm. Altogether, the percentage optical transmission increases on increasing the doping of L-histidine, L-threonine and DL-methionine in KDP crystals. On sacrifying slightly the UV-transparency cut-off limit, the L-histidine and DL- methionine doping increase the transparency of grown crystals, whereas, for L-threonine the UV- cut off limit remains almost unaltered and greater transparency is obtained. Optical Transmission Transparency Cut-off Pure KDP Crystal 72 % ≈ 350 nm KDP + 0.3% L-histidine 74 % ≈ 375 nm KDP + 0.4% L- histidine 76 % ≈ 375 nm KDP + 0.5% L- histidine 80 % ≈ 370 nm KDP + 0.3% L-threonine 78 % ≈ 350 nm KDP + 0.4% L- threonine 81 % ≈ 350 nm KDP + 0.5% L- threonine 86 % ≈ 350 nm KDP + 0.3% DL-methionine 74 % ≈ 385 nm KDP + 0.4% DL-methionine 77 % ≈ 385 nm KDP + 0.5% DL-methionine 81 % ≈ 380 nm 241
Chapter VI UV-Vis Spectroscopic…. Conclusion 1. As the doping level of amino acids increased the SHG efficiency increased. The effect of doping on SHG efficiency is roughly the same for all three dopant Viz. L-histidine, L-threonine and DL-methionine. The interaction of amino acids through hydrogen bond with KDP crystal may be responsible for enhanced SHG efficiency. 2. The UV cut-off frequency increased and the UV cut off limits except for L- threonine doped crystal decreased slightly as the doping increased. For obtaining higher percentage optical transmission in KDP crystals by doping L-histidine and DL-methionine, There was slight sacrifice in the UV cut-off limits. The percentage optical transmission for L- threonine doped KDP crystals was higher than pure and L-histidine and DL-methionine doped KDP crystals, but the UV cut-off limit remained almost constant without any deteoration. 3. Looking at SHG efficiency data, UV cut-off limit and percentage transmission data, it could be concluded that L-threonine doping in KDP was a better option compared to other two amino acids. 242
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Saurashtra University Re - Accredit
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Statements Under O. Ph.D.7 of Saura
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ACKNOWLEDGEMENT The author expresse
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in-law, Mother- in -law and all oth
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of NLO materials in rapidly develop
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doped samples in comparison to the
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micro-hardness decreases. Also, as
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Papers Published in National and In
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Seminar on Recent Advances in Conde
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Chapter I Brief Introduction... Cha
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Load (N) Chapter VIII Micro-hardnes
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