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Chapter VI UV-Vis Spectroscopic…. Chapter VI UV-Vis Spectroscopic and SHG Efficiency Studies of Pure and L-histidine, L-threonine and DL-methionine Doped KDP 6.1 Introduction Crystals Nonlinear optical (NLO) materials play a vital role in the fabrication of optoelectronic devices. Recent interest is focused on the development of materials which have suitable NLO properties for use as the active media in efficient second harmonic generators, tunable parametric oscillators and broadband electro-optic modulators. In this regard, a large number of compounds are needed to be screened for NLO applications. The Kurtz powder technique represents the first real means of screening experimentally large numbers of unknown materials for non linear activity without the need of growing good quality crystals of each material. In 1968 Kurtz and Perry [1, 2] showed that it is possible, by measurements on powders, to ascertain whether a crystal has large or small nonlinearity as well as it can be phase matched or not. From this information and the commonly known data of crystal properties, the probability of selecting a particular material for crystal growth to achieve NLO application is drastically increased. Kurtz and Perry [2] also proposed a powder SHG method for comprehensive analysis of the second order nonlinearity. Employing this technique, Kurtz surveyed a very large number of compounds. A good NLO crystal should also possess good transmission in ultra- violet and visible region. It is also important to find the UV cut-off limit for particular crystal. For this purpose UV-Vis spectroscopy is usually employed. 223
Chapter VI UV-Vis Spectroscopic…. In the present chapter the SHG efficiency of pure and amino acids doped KDP crystals are reported by using the Kurtz powder technique. The optical transparency and UV cut off limit for pure and amino acids doped KDP crystals are studied by UV-Vis spectroscopy. 6.2 Brief Theory of Kurtz and Perry Method To determine the essential features of second harmonic generation (SHG) in thin powder layers, the dependence of second harmonic intensity on, (1) angle between detector and direction of incident light beam (), (2) powder layer thickness (L) and (3) average particle size (rˆ ) and laser beam diameter (D) are studied [2]. Within certain ranges of layer thickness and particle size, it was found that a fairly simple and reproducible result could be obtained for above parameters. This region is rˆ
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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 II Solution Growth…. Tabl
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Chapter VIII Micro-hardness studies
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