Abstract
Full elements of second-order nonlinear optical (NLO) tensor can be completely characterized for an organic NLO crystal for the first time. As-grown bulk N-benzyl-2-methyl-4-nitroaniline (BNA) crystal was processed to expose (100) and (010) crystal orientations with fine optical surfaces by using precision lathe and diamond blade. Then, every five nonvanishing second-order NLO coefficient of BNA can be determined quantitatively using the precisely processed crystals based on 1st-kind Maker fringe measurements. Our method makes it possible to clarify uncertain NLO property of any organic materials and to accelerate application study via precise device fabrications even for fragile organic materials.
Highlights
Nonlinear optical (NLO) effects in materials have been widely utilized for optical signal-processing devices in information-telecommunication system
Since organic materials are very brittle, having hygroscopic properties, low melting temperatures and particular cleavage planes owing to weak intermolecular bonding, conventional processing technologies used for inorganic materials cannot be extrapolated to obtain arbitrary shape crystals and fine optical surfaces
They tried single point diamond turning for organic L-arginine phosphate (LAP) crystals to generate high quality optical surfaces and achieved ten-nm level
Summary
Nonlinear optical (NLO) effects in materials have been widely utilized for optical signal-processing devices in information-telecommunication system. They tried single point diamond turning for organic L-arginine phosphate (LAP) crystals to generate high quality optical surfaces and achieved ten-nm level www.nature.com/scientificreports rms roughness typically They found that there is no relation between processed surface roughness and processed crystal orientations. Non-centrosymmetric crystals are generally obtained when some partial molecular structures, such as bulky, hydrogen-bonding and/or chiral substituents, are effectively introduced Since these organic NLO crystals have poor crystal symmetry, there are many nonvanishing elements in the second-order NLO tensor of the crystals. We report characterization of all elements of second-order NLO tensor for the BNA crystal using precisely processed plane-parallel (100)- and (010)-slab crystals. This is the first accomplishment of measuring all elements of second-order NLO tensor completely for organic crystals
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