Studies of third-order optical nonlinearity and nonlinear absorption in tetra tolyl porphyrins using degenerate four wave mixing and Z-scan

2000 ◽  
Vol 182 (1-3) ◽  
pp. 255-264 ◽  
Author(s):  
S.Venugopal Rao ◽  
N.K.M.Naga Srinivas ◽  
D.Narayana Rao ◽  
L. Giribabu ◽  
Bhaskar G. Maiya ◽  
...  
Keyword(s):  
Nonlinear Absorption ◽  
Optical Nonlinearity ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Third Order ◽  
Degenerate Four Wave Mixing

Ultrafast Excitonic Nonlinearity in Regioregular Head-to-Tail Coupled Poly(3-Hexylthiophene)

1998 ◽  
Vol 07 (01) ◽  
pp. 161-166
Author(s):  
Yoshihiro Ueno ◽  
Shiho Kishino ◽  
Hideyuki Kunugita ◽  
Kazuhiro Ema ◽  
Masahiro Rikukawa ◽  
...  
Keyword(s):  
Relaxation Process ◽  
Decay Time ◽  
Optical Nonlinearity ◽  
Four Wave Mixing ◽  
Absorption Peak ◽  
Wave Mixing ◽  
Transient Grating ◽  
Exciton Absorption ◽  
Third Order ◽  
Degenerate Four Wave Mixing

Third-order optical nonlinearity of regioregular head-to-tail coupled poly(3-hexylthiophene)(HT-PHT) was measured using degenerate four wave mixing (DFWM), and the dispersion spectrum of |χ(3)| around the exciton absorption peak was obtained. In addition, the relaxation process of the excitons was measured using the transient grating method. The resultant decay time was less than 2 ps and consisted of two components.

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