Third-Order Optical Nonlinearity in a Polymer Composite

1989 ◽  
Vol 175 ◽  
Author(s):  
K. M. White ◽  
R. E. Harelstad ◽  
C. V. Francis ◽  
D. J. Gerbi ◽  
J. Stevens ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Polymeric Composite ◽  
Optical Nonlinearity ◽  
Electron Delocalization ◽  
Charge Transfer Complexes ◽  
Third Order ◽  
Third Harmonic ◽  
The Third ◽  
Nonlinear Characterization ◽  
Alternative Approach

AbstractThird-order optical nonlinearity in organic materials has generally been sought from molecules and polymers having extended i-electron delocalization in conjugated bonding schemes. In an alternative approach, we have investigated the third-order optical response of a polymeric composite containing charge transfer complexes in which the nonlinearity originates from intermolecular electron delocalization between π-electron clouds in charge transfer stacks. The material, which is composed of a polymer having electrondonating pendant side groups that complex with dopant electron-acceptor molecules, has been processed into an optically clear thin film. Nonlinear characterization of the film by means of third-harmonic generation suggests enhancement of the third-order response arising from charge transfer interactions.

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.

Investigation on ultrafast third-order optical nonlinearity of metal(dmit) 2 /(mnt) 2 charge transfer complexes

2003 ◽  
Vol 12 (3) ◽  
pp. 305-309 ◽  
Author(s):  
Wang Shu-Feng ◽  
Huang Wen-Tao ◽  
Liu Chu-Ling ◽  
Yang Hong ◽  
Gong Qi-Huang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Optical Nonlinearity ◽  
Charge Transfer Complexes ◽  
Third Order

Third-Order Optical Nonlinearity of a 1,3-Bis(2,4,6-Trihydroxy-Phenyl)Squaraine

2011 ◽  
Vol 80-81 ◽  
pp. 360-364
Author(s):  
Zhong Yu Li ◽  
Song Xu ◽  
Ying Du
Keyword(s):  
Intramolecular Charge Transfer ◽  
Optical Nonlinearity ◽  
Electron Delocalization ◽  
Wave Mixing ◽  
Optical Nonlinearities ◽  
Third Order ◽  
The Third ◽  
Ultrafast Optical ◽  
Nlo Response ◽  
Transfer Structure

The magnitude and dynamic response of the third-order optical nonlinearity of a 1,3-bis(2,4,6-trihydroxy-phenyl)squaraine was measured by femtosecond degenerate four-wave mixing (DFWM) technique at 800 nm. Ultrafast optical response has been observed and the magnitude of the second-order hyperpolarizability of the studied squaraine was measured as large as 3.8 ×10-31 esu. The large optical nonlinearities of the squaraine can be attributed to their rigid and intramolecular charge transfer structure, and the instantaneous NLO response of squaraine is mainly contributed from the electron delocalization.

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.

scholarly journals Ultrafast Third-Order Nonlinear Optical Response Excited by fs Laser Pulses at 1550 nm in GaN Crystals

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3194
Author(s):  
Adrian Petris ◽  
Petronela Gheorghe ◽  
Tudor Braniste ◽  
Ion Tiginyanu
Keyword(s):  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Laser Pulses ◽  
Third Harmonic Generation ◽  
High Repetition Rate ◽  
Third Order ◽  
Third Harmonic ◽  
The Third ◽  
High Repetition ◽  
Gan Crystal

The ultrafast third-order optical nonlinearity of c-plane GaN crystal, excited by ultrashort (fs) high-repetition-rate laser pulses at 1550 nm, wavelength important for optical communications, is investigated for the first time by optical third-harmonic generation in non-phase-matching conditions. As the thermo-optic effect that can arise in the sample by cumulative thermal effects induced by high-repetition-rate laser pulses cannot be responsible for the third-harmonic generation, the ultrafast nonlinear optical effect of solely electronic origin is the only one involved in this process. The third-order nonlinear optical susceptibility of GaN crystal responsible for the third-harmonic generation process, an important indicative parameter for the potential use of this material in ultrafast photonic functionalities, is determined.

Contribution of the 2 ^1Ag state to the third-order optical nonlinearity in a squaraine dye: errata

1994 ◽  
Vol 19 (22) ◽  
pp. 1909 ◽  
Author(s):  
James H. Andrews ◽  
John D. V. Khaydarov ◽  
Kenneth D. Singer
Keyword(s):  
Optical Nonlinearity ◽  
Third Order ◽  
The Third ◽  
Squaraine Dye
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