Abstract
Polydiacetylenes are well known as materials having very large off-resonant third-order susceptibilities.1-3 We recently reported a value of the nonlinear refractive index n2 of ~10−5(cm2/MW) at λ = 1.06 μm for PTS polydiacetylene waveguides.2 Large photoinduced absorption (two photonlike) in the off-resonant domain (away from the band-to-band transition) of polydiacetylene has been reported previously.3 Although some explanations for the origin of the large off-resonant nonlinearity have been provided previously using specific theoretical models,1 no definitive interpretation has been given for the large photoinduced absorption that has been observed.3 A new scheme that seems to explain both the photoinduced absorption as well as large off-resonant nonlinearity of polydiacetylene is discussed.
© 1990 Optical Society of America
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