The NLO properties of the high molecular weight (M-w > 200 000) MEH-PPV fil
ms spin casted on BK-7 glass substrates were studied by conventional Z-scan
technique in a wide near-infrared region 1100-1700 nm with a measurement s
tep 50 nm. It was shown that the chi (3) value for MEH-PPV in this waveleng
th range varies from 3.6x10(-10) esu up to the maximum value 1.5x10(-9) esu
at 1450 nm. The precision of Z-scan measurements was controlled using stan
dard chi (3) values of BK-7 glass and nitrobenzene.