Nonlinear Optical Properties of Two Thiophene-Based Polyconjugated Systems: Photoinduced Absorption and Third Harmonic Generation Spectroscopy

1989 ◽  
Vol 173 ◽  
Author(s):  
R. Zamboni ◽  
C. Taliani ◽  
G. Ruani ◽  
A. J. Pal ◽  
F. Kajzar
Keyword(s):  
Optical Properties ◽  
Conjugated Polymers ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Third Harmonic Generation ◽  
Nonlinear Optical Properties ◽  
Photoinduced Absorption ◽  
Third Harmonic ◽  
Optical Gap ◽  
The Third

ABSTRACTNonlinear optical properties of two thiophene-based conjugated polymers (PTT and PDTB) were studied by the photoinduced absorption spectroscopy and the third harmonic generation spectroscopy. The results obtained with these two methods are used to estimate the value of χ(3) in these materials. Resonant χ(3) are (2.0 ± 0.2) × 10−11 e.s.u. and (1.0 ± 0.1) × 10−11 e.s.u. for PTT and PDTB, respectively. χ(3) is shown to be related to the width of the optical gap through a sixth-power law. In PTT a vibronic structure due to the C = C stretching mode appears in the χ(3) spectrum.

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.

Linear and nonlinear optical properties of indeno[2,1-b]fluorene and its structural isomers

2014 ◽  
Vol 16 (44) ◽  
pp. 24592-24597 ◽  
Author(s):  
Simil Thomas ◽  
Kwang S. Kim
Keyword(s):  
Optical Properties ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Third Harmonic Generation ◽  
Nonlinear Optical Properties ◽  
Structural Isomers ◽  
Third Harmonic ◽  
Diradical Character ◽  
Linear And Nonlinear

The DMRG method reveals that third harmonic generation coefficients (γ) of indeno[2,1-b]fluorene and its structural isomers correlate with their diradical character.

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.

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.

Defect engineering, microstructural examination and improvement of ultrafast third harmonic generation in GaZnO nanostructures: a study of e-beam irradiation

2020 ◽  
Vol 22 (7) ◽  
pp. 4252-4265 ◽  
Author(s):  
Albin Antony ◽  
Poornesh P. ◽  
I. V. Kityk ◽  
K. Ozga ◽  
J. Jedryka ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electron Beam ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Third Harmonic Generation ◽  
Beam Irradiation ◽  
Defect Engineering ◽  
Third Harmonic ◽  
Doped Zno ◽  
Microstructural Examination

Electron beam induced effects on defect engineering and structural, morphological and optical properties of Ga doped ZnO (GaZnO) nanostructures for improved ultrafast nonlinear optical properties are presented.

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