Enhanced Third Order Optical Nonlinear Response in Polythiophene Films—Polaron Contributions

1989 ◽  
Vol 173 ◽  
Author(s):  
Lina Yang ◽  
R. Dorsinville ◽  
R. Zamboni ◽  
C. Taliani ◽  
R. Tubino ◽  
...  
Keyword(s):  
Nonlinear Response ◽  
Four Wave Mixing ◽  
Nonlinear Susceptibility ◽  
Wave Mixing ◽  
Third Order ◽  
Pump Probe ◽  
Order Of Magnitude ◽  
Degenerate Four Wave Mixing ◽  
Thiophene Based Polymers ◽  
Third Order Nonlinear Susceptibility

ABSTRACTThe enhancement of the third order nonlinear susceptibility χ(3)) of an homologous series of polycondensed thiophene based polymers was observed about photoinduced polaronic bands by a novel “pump-probe” degenerate four wave mixing echnique. Enhancement of the degenerate four wave mixing signal for more than an order of magnitude was achieved with response time of less than 25 ps. The intrachain polarons contribution is proposed as the possible mechanism responsible for the observed enhancement.

Generation of Non-Classical Light by Four-Wave Mixing in Semiconductors

1998 ◽  
Vol 07 (02) ◽  
pp. 167-180
Author(s):  
A. M. Fox ◽  
M. Dabbicco ◽  
J. F. Ryan
Keyword(s):  
Phase Modulation ◽  
Four Wave Mixing ◽  
Nonlinear Susceptibility ◽  
Squeezed States ◽  
Wave Mixing ◽  
Third Order ◽  
Susceptibility Tensor ◽  
Squeezed Light ◽  
The Third ◽  
Third Order Nonlinear Susceptibility

We describe experiments to generate non-classical quadrature squeezed states of light by four-wave mixing in semiconductors. Squeezing can be achieved with either the diagonal or off-diagonal components of the third-order nonlinear susceptibility tensor. We have demonstrated squeezing by self-phase modulation in ZnS at 780 nm, and by cross-phase modulation in ZnSe at 960 nm. Possibilities for generating squeezed light in other materials by these techniques are discussed.

scholarly journals Generalized Kramers–Kronig relations and sum rules for moments and powers of degenerate four wave mixing susceptibility

2021 ◽  
Author(s):  
Jarkko J. Saarinen
Keyword(s):  
Sum Rules ◽  
Terahertz Spectroscopy ◽  
Theoretical Models ◽  
Present Theory ◽  
Four Wave Mixing ◽  
Dispersion Relations ◽  
Nonlinear Susceptibility ◽  
Complex Frequency ◽  
Wave Mixing ◽  
Degenerate Four Wave Mixing

AbstractGeneralized Kramers–Kronig (K–K) type dispersion relations and sum rules are derived in the static limit for the moments of the degenerate four wave mixing susceptibility. The degenerate nonlinear susceptibility is different from a typical use of the conventional K–K dispersion relations, which assume absence of complex poles of a function in the upper half of complex frequency plane, whereas degenerate susceptibility has simultaneous poles in both half planes. In the derivation of the generalized K–K relations the poles and their order are taken into account by utilization of the theorem of residues. The conventional K–K relations can be used to estimate the real and imaginary parts of the second and higher powers of the susceptibility as the effect of the poles is reduced due to a faster convergence of the dispersion relations. The present theory is directly applicable to higher order susceptibilities and can be used in testing of theoretical models describing the degenerate four wave mixing susceptibility in nonlinear optical and terahertz spectroscopy.

Degenerate four-wave mixing measurements of the nonlinear response of conjugated silicon-ethynylene polymers

1999 ◽  
Author(s):  
Oleg L. Antipov ◽  
Andrey V. Afanasiev ◽  
George A. Domrachev ◽  
William E. Douglas ◽  
Daniel M. H. Guy ◽  
...  
Keyword(s):  
Nonlinear Response ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Degenerate Four Wave Mixing
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