Enhancement of Optical Third Order Nonlinearity in Main-Chain Oriented Polythiophenes

1991 ◽  
Vol 244 ◽  
Author(s):  
Haruki Okawa ◽  
Tatsuo Wada ◽  
Hiroyuki Sasabe
Keyword(s):  
Conjugated Polymers ◽  
Main Chain ◽  
Nonlinear Susceptibility ◽  
Third Order ◽  
Polymer Backbone ◽  
Third Harmonic ◽  
One Dimensional ◽  
Nonlinear Responses ◽  
Large Enhancement ◽  
Third Order Nonlinear Susceptibility

ABSTRACTThe third order nonlinear responses for soluble one-dimensional ϕ-conjugated polymers, poly(3-alkylthiophene)s were investigated. Uniaxial stretching of the polymer film was carried out to align the polymer backbone. The stretched film showed large dichroism and crystallinity. Third order nonlinear susceptibility, χ(3)1111 of the stretched film was determined by optical third harmonic generation. A large enhancement of χ(3) due to the main chain alignment was observed.

THE THIRD ORDER NONLINEAR SUSCEPTIBILITY OF INTERACTING ONE-DIMENSIONAL FRENKEL EXCITONS

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3809-3812 ◽  
Author(s):  
H. Ishihara ◽  
T. Amakata
Keyword(s):  
Exciton State ◽  
Nonlinear Susceptibility ◽  
State Transitions ◽  
Third Order ◽  
One Dimensional ◽  
Long Wavelength ◽  
The Third ◽  
Wavelength Approximation ◽  
Frenkel Excitons ◽  
Third Order Nonlinear Susceptibility

An analytical expression of the third order nonlinear susceptibility χ(3) has been derived rigorously for a system of interacting Frenkel excitons in a one-dimensional chain of size N with the periodic boundary conditions. It has been clarified that the magnitude of interacting potential between excitons strongly influences the size dependence of χ(3) in the long wavelength approximation, which is well explained in terms of the cancellation effect between the contributions from [ground state] - [one-exciton] transitions and those from [one-exciton] - [two-exciton state] transitions.

EFFECT OF VACUUM FIELD RABI OSCILLATIONS ON THIRD ORDER NONLINEAR SUSCEPTIBILITY

1991 ◽  
Vol 05 (14) ◽  
pp. 2347-2353
Author(s):  
MUBEEN A. MIR ◽  
TAHIRA NASREEN ◽  
M.S.K. RAZMI
Keyword(s):  
Third Harmonic Generation ◽  
Vacuum Field ◽  
Nonlinear Susceptibility ◽  
Interference Effects ◽  
Rabi Oscillations ◽  
Third Order ◽  
Third Harmonic ◽  
Peak Splitting ◽  
Two Photon ◽  
Third Order Nonlinear Susceptibility

Third order nonlinear susceptibility of two-level atoms dressed by the cavity vacuum is studied to see the effect of Rabi oscillations. It is found that while the interference effects remove the peaks of on-resonance third harmonic generation, peak splitting is seen for Raman scattering and two photon processes.

Glass Structures and Linea/Nonlinear Optical Properties of Ag2O-Doped TeO2 Glasses

2014 ◽  
Vol 617 ◽  
pp. 141-144 ◽  
Author(s):  
Yusuke Kasuya ◽  
Toshiki Suhara ◽  
Tomokatsu Hayakawa ◽  
Philippe Thomas ◽  
Masayuki Nogami
Keyword(s):  
Optical Properties ◽  
Absorption Edge ◽  
Photoelectron Spectroscopy ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Nonlinear Susceptibility ◽  
Third Order ◽  
Nonlinear Properties ◽  
Nonlinear Optical Devices ◽  
Third Order Nonlinear Susceptibility

A family of TeO2-based glasses is known to have high third-order nonlinear properties and expected as nonlinear optical devices. In the present study, we fabricated Ag2O-TeO2 and Ag2O-Nb2O5-TeO2 glasses, and estimated their structures and linear/nonlinear optical properties. The main results showed that the absorption-edge of the glasses was shifted to longer wavelength side with increasing Ag2O content. By Raman spectroscopy, it was found that an increase in Ag2O content promoted to change TeO4 to TeO3/TeO3+1 units. X-ray photoelectron spectroscopy (XPS) revealed the presence of an electronic state of Ag2+ ions, which was supposed to have a large influence on the absorption-edge wavelength. In Ag2O-Nb2O5-TeO2 glass system, the third-order nonlinear susceptibility χ(3) increased with increasing Ag2O content at the expense of Nb2O5 content.

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