Measurements for the nonlinear refractive index of a new kind of polymer material doped with chlorophyll using nanosecond laser pulses.
A new kind of organic polymer doped with natural active chlorophyll is made, and self-focusing and saturable absorption are observed on it under the excited laser light at 532 nm with a pulse width of 20 ns. The nonlinear refractive indices n(2), estimated to be ~10(-7) cm(2)/W, measured by two methods were consistent with each other. By analyzing the experimental data based on the glassy polymer dye model, it can be confirmed that the nonlinearity is induced by the transition of excited on-site pi electrons.
S C
SC
Yang
Q M
QM
Qian
L P
LP
Zhang
P H
PH
Qiu
Z J
ZJ
Wang