scholarly journals Twins in YAl3(BO3)4 and K2Al2B2O7 Crystals as Revealed by Changes in Optical Activity

Crystals ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 8 ◽  
Author(s):  
Johannes Buchen ◽  
Volker Wesemann ◽  
Steffen Dehmelt ◽  
Andreas Gross ◽  
Daniel Rytz
Keyword(s):  
Optical Properties ◽  
Optical Activity ◽  
Nonlinear Optical ◽  
Frequency Conversion ◽  
Optical Rotation ◽  
Visible Spectrum ◽  
Rotatory Power ◽  
Nonlinear Optical Properties ◽  
Crystal Quality ◽  
Optical Rotatory Dispersion

Many borate crystals feature nonlinear optical properties that allow for efficient frequency conversion of common lasers down into the ultraviolet spectrum. Twinning may degrade crystal quality and affect nonlinear optical properties, in particular if crystals are composed of twin domains with opposing polarities. Here, we use measurements of optical activity to demonstrate the existence of inversion twins within single crystals of YAl 3 (BO 3 ) 4 (YAB) and K 2 Al 2 B 2 O 7 (KABO). We determine the optical rotatory dispersion of YAB and KABO throughout the visible spectrum using a spectrophotometer with rotatable polarizers. Space-resolved measurements of the optical rotation can be related to the twin structure and give estimates on the extent of twinning. The reported dispersion relations for the rotatory power of YAB and KABO may be used to assess crystal quality and to select twin-free specimens.

Enhancement of Nonlinear Optical Properties Through Supramolecular Chirality

1999 ◽  
Vol 561 ◽  
Author(s):  
S. Van Elshocht ◽  
B. Busson ◽  
T. Verbiest ◽  
M. Kauranen ◽  
J. Snauwaert ◽  
...  
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Frequency Conversion ◽  
Nonlinear Optical Properties ◽  
Pure Material ◽  
Enantiomerically Pure ◽  
Langmuir Blodgett ◽  
Supramolecular Chirality ◽  
Langmuir Blodgett Films ◽  
Supramolecular Aggregation

ABSTRACTWe study second-order nonlinear optical properties of enantiomerically pure and racemic Langmuir-Blodgett films of a chiral helicenebisquinone. Supramolecular aggregation of the material enhances the nonlinear efficiency of the enantiomerically pure material. We also show that the material is potentially useful for constructing quasi-phase-matched structures for frequency conversion.

scholarly journals Calculation of nonlinear optical properties of lithium niobate crystals

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 72-76
Author(s):  
D. A. Vorobev ◽  
◽  
O. V. Sidorova ◽  
M. N. Palatnikov ◽  
A. V. Kadetova ◽  
...  
Keyword(s):  
Optical Properties ◽  
Lithium Niobate ◽  
Nonlinear Optical ◽  
Frequency Conversion ◽  
Lithium Niobate Crystal ◽  
Second Harmonic ◽  
Polar Axis ◽  
Nonlinear Optical Properties ◽  
Optical Effects ◽  
Lithium Niobate Crystals

The coefficients of the second-order nonlinear optical tensor for lithium niobate crystal with a composition close to stoichiometric were calculated. The calculated results show that the contribution of the Li-O group to the optical effects of the second harmonic was greater than the contribution of the Nb-O group. The results also showed that the most efficient frequency conversion occurred along the polar axis of the crystal

Synthesis, Characterization, and Processing of Organic Nlo Polymers

1992 ◽  
Vol 247 ◽  
Author(s):  
Mark A. Druy ◽  
Paul J. Glatkowski ◽  
Ryszard Burzynski
Keyword(s):  
Optical Properties ◽  
Optical Activity ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Optical Polymers ◽  
Third Order ◽  
Nonlinear Optical Polymers

ABSTRACTThe research described in part in this manuscript is a multi disciplinary effort to target key applications and material and processing requirements for these third order nonlinear optical polymers. It discusses the synthesis, characterization, and processing of nonlinear optical properties of polyimides which have been tailored for nonlinear optical activity.

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