Nonlinear Optical Properties of PBT in Nematic Solutions

1990 ◽  
Vol 214 ◽  
Author(s):  
Hedi Mattoussi ◽  
Philip G. Kaatz ◽  
Gary D. Patterson ◽  
Guy C. Berry
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Lyotropic Liquid Crystal ◽  
Fringe Analysis ◽  
Third Order ◽  
Third Harmonic ◽  
Nematic Director ◽  
Fringe Patterns ◽  
Maker Fringe

ABSTRACTThird-order nonlinear optical properties of lyotropic liquid crystal poly(1,4-phenylene-2,6-benzobisthiazole), PBT, solutions are studied by third harmonic generation measurements. Besides the enhancement observed for this coefficient with respect to the pure PBT, coupling is observed between the mean filed nematic director n and the incident fundamental polarization B0. Different geometries, with respect to the relative orientation of B0 and n, provided different harmonic Maker Fringe Patterns. These data are compared using refractive index measurements, independently achieved on these materials, and necessary for Maker Fringe analysis.

Nonlinear Optical Properties of Ladder Polymers and Their Model Compound

1990 ◽  
Vol 214 ◽  
Author(s):  
Samson A. Jenekhe ◽  
Michael Roberts ◽  
Ashwini K. Agrawal ◽  
Jeffrey S. Meth ◽  
Herman Vanherzeele
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Model Compound ◽  
Third Harmonic Generation ◽  
Nonlinear Optical Properties ◽  
Third Order ◽  
Third Harmonic ◽  
The Third ◽  
Ladder Polymers

ABSTRACTThe third order nonlinear optical properties of thin films of polybenzimidazobenzophenanthroline ladder (BBL) and semi–ladder (BBB) polymers and their model compound cis–BBB were investigated by picosecond, third harmonic generation. The χ(3) (−3ω, ω ω, ω) spectrum of BBL, BBB, and cis-BBB was obtained in the wavelength range 1.0–2.4µm and shown to exhibit a three–photon peak at respectively 1.695, 1.695, and 1.50 µm. The magnitude of the three–photon enhanced χ(3) was 6.40×10−11, 3.15×10−11, and 0.77×10−11 esu, respectively, for BBL, BBB, and cis–BBB. The results show that the χ(3) of BBL and BBB is enhanced by a factor of 50 and 17, respectively, relative to the model compound cis–BBB at 1.05µm.

Third-Order Nonlinear Optical Properties of a Series of Systematically Designed Conjugated Rigid-Rod Polyquinolines

1992 ◽  
Vol 247 ◽  
Author(s):  
Ashwini K. Agrawal ◽  
Samson A. Jenekhe ◽  
Herman Vanherzeele ◽  
Jeffrey S. Meth
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Scaling Law ◽  
Optical Nonlinearity ◽  
Nonlinear Optical Properties ◽  
Model Compounds ◽  
Third Order ◽  
Third Harmonic ◽  
The Third ◽  
Rigid Rod

ABSTRACTThe third-order nonlinear optical properties of thin films of two series of conjugated rigid-rod polyquinolines, exemplified by poly(2, 2'-(l, 4-phenylene)-6, 6'-bis(4-phenyl quinoline)) (PPPQ, 2d) and poly(2, 7-(l, 4-phenylene)-4, 9-diphenyl-l, 6-anthrazoline) (PPDA, 3d), were investigated by third harmonic generation spectroscopy. Of the nine polyquinolines with diverse backbone structures, PPPQ has the largest optical nonlinearity with a χ(3) (-3ω; ω, ω, ω) value of 3.2 × 10−12 esu and 3.3 × 10−11 esu in the off-resonant and three-photon resonant regions, respectively. A comparison of the nonresonant χ(3) of the series of nine systematically derived polyquinolines showed that a scaling law of the form χ(3) ∼ (λmax)v ∼ Eg-v does not hold; in fact, the nonresonant χ(3) was essentially independent of the optical bandgap. These results suggest that structure-χ(3) propeny relationships in polymers cannot be inferred from those of oligomers and model compounds.

Cubic Nonlinear Optical Properties of Thin Films of a Series of Aromatic Schiff Base Polymers

1992 ◽  
Vol 247 ◽  
Author(s):  
Chen-Jen Yang ◽  
Samson A. Jenekhe ◽  
Herman Vanherzeele ◽  
Jeffrey S. Meth
Keyword(s):  
Optical Properties ◽  
Schiff Base ◽  
Nonlinear Optical ◽  
Random Copolymer ◽  
Optical Nonlinearity ◽  
Nonlinear Optical Properties ◽  
Third Order ◽  
Third Harmonic ◽  
Schiff Base Polymers ◽  
Photon Resonance

ABSTRACTThe third-order nonlinear optical properties of a series of homopolymers and a random copolymer of conjugated aromatic Schiff base polymers have been investigated by picosecond third harmonic generation spectroscopy in the wavelength range 0.9–2.4 um. The off-resonant χ(3)(-3ω;ω, ω, ω) value at 2.4 μm was found to be 1.6×10−12esu for the parent polymer (PPI). 2, 5-Dimethoxy and 2, 5-dihydroxy substitutions or random colpolymerization was found to enhance the nonresonant optical nonlinearity of PPI by a factor of 1.5–4.5. 2-Methyl substitution lowered the χ(3) value. The three-photon resonance enhanced χ(3) of the polymers was in the range l.l×10−11 to 5.2×l0−11 esu. A three-level essential states model was found to describe the observed χ(3) spectra and the resulting fitting parameters were used to explain the observed trends in structure - χ(3) relationships.

Synthesis, characterization and third order nonlinear optical properties of trans-A2B-tpye cobalt corroles

2021 ◽  
Author(s):  
Guifen Lu ◽  
Peng Zhang ◽  
Yuanyuan Fang ◽  
Yongjie Gao ◽  
Qikang Hu
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Para Position ◽  
Third Order

A series of trans-A2B cobalt corroles, represented as [Cor(p-RPh)2(p-NO2Ph)]Co(PPh3) (1-5), where Cor is trianion of corrole, R is a CN, F, CH3, C(CH3)3 or PhCH2O on the para-position of the...

Physical origin of the third-order nonlinear optical properties of polyenes

2005 ◽  
Vol 52 (14) ◽  
pp. 1933-1945 ◽  
Author(s):  
I. Fuks-Janczarek ◽  
I. V. Kityk * ◽  
J. Berdowski ◽  
B. Sahraoui ◽  
C. Andraud
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Physical Origin ◽  
Third Order ◽  
The Third
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