scholarly journals Second harmonic generation from the `centrosymmetric' crystals

IUCrJ ◽  
2015 ◽  
Vol 2 (3) ◽  
pp. 317-321 ◽  
Author(s):  
Venkatram Nalla ◽  
Raghavender Medishetty ◽  
Yue Wang ◽  
Zhaozhi Bai ◽  
Handong Sun ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Uv Light ◽  
Second Harmonic ◽  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Potassium Dihydrogen ◽  
Space Group ◽  
Shg Efficiency ◽  
Optical Phenomena

Second harmonic generation (SHG) is a well known non-linear optical phenomena which can be observed only in non-centrosymmetric crystals due to non-zero hyperpolarizability. In the current work we observed SHG from a Zn(II) complex which was originally thought to have crystallized in the centrosymmetric space groupC2/c. This has been attributed to the unequal antiparallel packing of the metal complexes in the non-symmetric space groupCcor residual non-centrosymmetry inC2/cgiving rise to polarizability leading to strong SHG. The enhancement of SHG by UV light has been attributed to the increase in non-centrosymmetry and hence polarity of packing due to strain induced in the crystals. The SHG signals measured from these crystals were as large as potassium dihydrogen phosphate crystals, KH2PO4(KDP), and showed temperature dependence. The highest SHG efficiency was observed at 50 K. The SHG phenomenon was observed at broad wavelengths ranging from visible to below-red in these crystals.

scholarly journals Synthesis, Growth and Characterization of New Promising Organic Non-Linear Optical Crystal: L-Alanine Alaninium Nitrate

2019 ◽  
Vol 31 (8) ◽  
pp. 1661-1666
Author(s):  
G. Krishnamoorthi ◽  
R. Uvarani
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Visible Region ◽  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Dielectric Study ◽  
Second Harmonic Generation Efficiency ◽  
Cell Parameters ◽  
Induced Defects

A relative study on pure L-alanine alaninium nitrate (LAAN) single crystals and doped with lanthanum oxide, urea and glycine were developed from fluid solution by slow evaporation strategy at room temperature. X-ray diffraction result reveals that LAAN crystallites with system with space bunch P21 and cell parameters a = 7.836 Å, b = 5.428 Å, c = 12.809 Å and β = 94.25°. These parameters were marginally changes for doped crystals compared to pure LAAN crystal. The UV results recommend that the great transmission property of the doped LAAN crystal within the whole visible region guarantees its reasonableness for second harmonic generation applications. The presence of dopants within the LAAN crystal was further affirmed through ICP studies. The functional groups were analyzed through Fourier change infrared spectra investigation. The microhardness and dielectric study at 100 Hz was found to be broadly higher than that of pristine LAAN. The AC conductivity was found to extend after doping due to the induced defects in crystal lattice. The grown crystals were also subjected to second harmonic generation efficiency tests and it was found to be La2O3 doped LAAN crystal is 2.8 times greater than that of potassium dihydrogen phosphate (KDP).

scholarly journals Crystal Structure of L-Histidinium 2-Nitrobenzoate

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Subramanian Natarajan ◽  
Kalimuthu Moovendaran ◽  
Jeyaperumal Kalyana Sundar ◽  
Krishnan Ravikumar
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
X Ray Diffraction ◽  
Potassium Dihydrogen ◽  
X Ray ◽  
Shg Efficiency

A new nonlinear optical organic compound, namely, L-histidinium 2-nitrobenzoate (abbreviated as LH2NB (I); ([C6H10N3O2]+ [C7H4NO4]−)), was synthesized. The molecular structure of LH2NB (I) was elucidated using single crystal X-ray diffraction technique. The second harmonic generation (SHG) efficiency of this compound is about two times that of the standard potassium dihydrogen phosphate crystals.

An non-centrosymmetric mononuclear Zr complex exhibiting UV second-harmonic-generation

2015 ◽  
Vol 08 (02) ◽  
pp. 1550029
Author(s):  
Cai-Yun Han ◽  
Mei Qu ◽  
Qin-Qin Dang ◽  
Xian-Ming Zhang
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Organic Ligand ◽  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Strong Response ◽  
Oxygen Donor ◽  
Transmission Study

A novel non-centrosymmetric (NCS) orthorhombic complex Zr ( dmpu )2 Cl 4 (1) has been solvothermally prepared in situ from starting materials of Zirconium(IV) acetylacetonate ( Zr ( acac )4) and N,N-dimethylpropyleneurea (dmpu), in which dmpu can act not only as solvent but also as organic ligand of monodentate oxygen donor. The second-harmonic generation (SHG) measurements reveal that complex 1 has a strong response of 1.4 times that of potassium dihydrogen phosphate (KDP) at 532 nm based on the Kurtz–Perry method. Furthermore, optical transmission study indicates that complex 1 has a wide transparency range in the UV region (200–850 nm) with a cutoff at 291 nm. According to first-principles calculations, the enhanced macroscopic SHG response of 1 can be attributed to the organic ligand dmpu. Therefore, 1 could be a promising candidate for non-linear optical material.

scholarly journals Characterization of salt interferences in second-harmonic generation detection of protein crystals

2013 ◽  
Vol 46 (6) ◽  
pp. 1903-1906 ◽  
Author(s):  
R. G. Closser ◽  
E. J. Gualtieri ◽  
J. A. Newman ◽  
G. J. Simpson
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Sparse Matrix ◽  
Second Harmonic ◽  
Protein Crystallization ◽  
Potassium Dihydrogen Phosphate ◽  
Protein Crystals ◽  
Dihydrogen Phosphate ◽  
Crystal Formation ◽  
Crystallization Experiments

Studies were undertaken to assess the merits and limitations of second-harmonic generation (SHG) for the selective detection of protein and polypeptide crystal formation, focusing on the potential for false positives from SHG-active salts present in crystallization media. The SHG activities of salts commonly used in protein crystallization were measured and quantitatively compared with reference samples. Out of 19 salts investigated, six produced significant background SHG and 15 of the 96 wells of a sparse-matrix screen produced SHG upon solvent evaporation. SHG-active salts include phosphates, hydrated sulfates, formates and tartrates, while chlorides, acetates and anhydrous sulfates resulted in no detectable SHG activity. The identified SHG-active salts produced a range of signal intensities spanning nearly three orders of magnitude. However, even the weakest SHG-active salt produced signals that were several orders of magnitude greater than those produced by typical protein crystals. In general, SHG-active salts were identifiable through characteristically strong SHG and negligible two-photon-excited ultraviolet fluorescence (TPE-UVF). Exceptions included trials containing either potassium dihydrogen phosphate or ammonium formate, which produced particularly strong SHG, but with residual weak TPE-UVF signals that could potentially complicate discrimination in crystallization experiments using these precipitants.

Efficient Second Harmonic Generation in Hydrazone, Derivatives of Substituted Aromatic Aldehydes

1989 ◽  
Vol 173 ◽  
Author(s):  
Richard S. Potember ◽  
Robert C. Hoffman ◽  
Karen A. Stetyick
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Harmonic Signal ◽  
Aromatic Aldehydes ◽  
Dihydrogen Phosphate ◽  
Ammonium Dihydrogen Phosphate ◽  
Harmonic Signals ◽  
Derivatives Of ◽  
Second Harmonic Signal

ABSTRACTHydrazone, 1,1-dimethylhydrazone, methylhydrazone, phenylhydrazone and p-nitrophenyl hydrazone derivatives of substituted aromatic aldehydes were prepared and screened for second harmonic generation using the Kurtz powder technique. One compound, 4-nitro-3-methoxybenzaldehyde hydrazone exhibited a second harmonic signal up to 32 times that of ammonium dihydrogen phosphate (ADP) and 4-nitrobenzaldehyde hydrazone exhibited a second harmonic signal five times higher than previously reported, up to 40 times that of ADP. 3-methyl-4-nitrobenzaldehyde hydrazone, 4-nitrobenzaldehyde phenylhydrazone, 1-naphthaldehyde phenylhydrazone, 1-pyrenecarboxaldehyde phenylhydrazone exhibited second harmonic signals 25, 2.5, 5 and 20 times that of an ADP standard.

SECOND HARMONIC GENERATION, THERMAL AND OPTICAL STUDY OF POTASSIUM IODIDE DOPED L-THREONINE SINGLE CRYSTAL

2013 ◽  
Vol 22 (03) ◽  
pp. 1350031 ◽  
Author(s):  
PRATIK M. WANKHADE ◽  
GAJANAN G. MULEY
Keyword(s):  
Second Harmonic Generation ◽  
Single Crystal ◽  
Harmonic Generation ◽  
Potassium Iodide ◽  
Second Harmonic ◽  
Dihydrogen Phosphate ◽  
Generation Efficiency ◽  
Orthorhombic Crystal ◽  
Second Harmonic Generation Efficiency ◽  
Orthorhombic Crystal Structure

Potassium iodide doped L-threonine (LTPI) single crystal with improved second harmonic generation efficiency, thermal stability and optical transmission was grown by low temperature solution growth method from aqueous solution. The grown crystal has 1.22 times second harmonic generation efficiency compared to the standard potassium dihydrogen phosphate. LTPI has a high optical transparency over a wide spectral range 245–1083 nm and lower cut-off at around 219 nm. LTPI crystallizes in the orthorhombic crystal structure with space group P212121. It is thermally stable up to 238°C. In this paper, the photoluminescence study, FT-IR spectroscopic study and elemental analysis have been presented.

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