Download (4Mb) - Etheses - Saurashtra University

Chapter VI UV-Vis Spectroscopic….
bonds, which leads to wide transparency ranges in the visible and UV spectral
regions and (iii) zwitter ionic nature of the molecule, which favors crystal
hardness for application in devices. Therefore, in many semi-organic
materials crystals different amino acids were used, for example, L-alaninium-
oxalate [23], tetra L-lysine alanine monohydrochloride dihydrate [24] L-
arginine hydrochloride monohydrate [25], L-histidine hydrochloride
monohydrate [26], L-proline cadmium chloride monohydrate [27], etc.
Moreover, pure amino acid crystals have been grown for NLO applications, for
example, L-alanine crystals exhibited higher damage threshold than KDP [28].
L-threonine exhibited the second and third order optical non-linearities and the
phase matching curves for second harmonic generation were obtained [29].
To investigate the effect of different amino acids doping on the SHG
efficiency of KDP crystals, the Kurtz powder technique has been employed
and the results are given in the following section. The single crystals of pure
and L-histidine, L-threonine and DL-methionine doped KDP crystals were
grown by the slow aqueous solution evaporation technique, which is
described in Chapter-II.
6.4 Experimental Setup
Kurtz and Perry powder technique was employed to obtain the second
harmonic generation (SHG) efficiency. The schematic representation of the
experimental set-up of Kurtz powder method used for the comprehensive
analysis of the second order nonlinearity is shown in figure (6.3).
In the present study, Q-switched Nd:YAG laser emitting 1064 nm, 10 ns
laser pulses having repetition rate 10 Hz with spot radius of 1 mm was used
as a source for illuminating the powder sample.
231