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.

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.

Third-order nonlinear optical properties of the Na2S–PbS–GeS2 sulfide glasses and the Na2S–PbO–GeS2 oxysulfide glasses

1999 ◽  
Vol 14 (2) ◽  
pp. 330-333 ◽  
Author(s):  
Zhong Hua Zhou ◽  
Hiroyuki Nasu ◽  
Tadanori Hashimoto ◽  
Kanichi Kamiya
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Third Harmonic Generation ◽  
Optical Nonlinearity ◽  
Chemical Durability ◽  
Number Density ◽  
Third Order ◽  
Third Harmonic ◽  
The Third ◽  
Maximum Value

The third-order optical nonlinearity of glasses of the Na2S–PbS–GeS2 and Na2S–PbO–GeS2 systems was measured by third-harmonic generation method. The third-order nonlinearities of glasses of both systems increase with the increasing lead content. The maximum value of the third-order optical nonlinearity was 3.00 × 10-12 esu. The addition of PbO basically has little influence on third-order optical nonlinearity, and the largest nonlinearity is 1.49 × 10-12 esu. The minimum appearing at 15 mol% PbO can be explained by the decrease of number density of lead and sulfur. Chemical durability of oxysulfide glasses is superior to that of a pure sulfide system; thus the addition of PbO is important in this sense.

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.

Linear and Nonlinear Optical Properties of Mesoionic Oxyallyl Derivatives: Enhanced Non-Resonant Third Order Optical Nonlinearity in Croconate Dyes

2008 ◽  
Vol 112 (34) ◽  
pp. 13272-13280 ◽  
Author(s):  
Ch. Prabhakar ◽  
K. Yesudas ◽  
K. Bhanuprakash ◽  
V. Jayathirtha Rao ◽  
R. Sai Santosh Kumar ◽  
...  
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Optical Nonlinearity ◽  
Nonlinear Optical Properties ◽  
Third Order ◽  
Linear And Nonlinear
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