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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
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