Saturable absorption in poly(indenofluorene):?a picket-fence polymer
Marek SamoćLaser Physics Centre, Australian Photonics Cooperative Research Centre, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, AustraliaAnna SamoćLaser Physics Centre, Australian Photonics Cooperative Research Centre, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, AustraliaBarry Luther‐DaviesLaser Physics Centre, Australian Photonics Cooperative Research Centre, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, AustraliaHelge A. ReischMax-Planck Institut für Polymerforschung, Mainz, GermanyUllrich ScherfMax-Planck Institut für Polymerforschung, Mainz, Germany
1998en
ABI
Аннотация
Poly(indenofluorene) shows a strong degenerate four-wave mixing (DFWM) response when it is excited with 100-fs pulses at 800 nm. The DFWM signal scales with the 1.5 power of the input intensity, which we interpret as being due to absorption saturation phenomena. The saturation was studied by open-aperture Z scan in dilute solutions of poly(indenofluorene) in chloroform. The changes in the absorption coefficient alpha are described by the formula alpha = alpha(0)/[1 + (I/I(sat))(1/2)], where I(sat) is the saturation intensity, which is found to be of the order of 100>MW/cm(2).
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