Optical phase conjugation and photoisomerization of novel polyester films functionalizied by nitroazobenzene with push pull structures

The optical phase conjugation and photoisomerization of some films of two kinds of polyesters functionalizied by 4-bis(N,N hydroxyethylene)-imino-4-nitroazobenzene have been studied.The photoresponsive mechanism of these films was explained quite well by a model of four-level energy system,which was consisting of two pairs of siglet states of trans and cis isomers,respectively.Photoismerization was the main intramolecular relaxtion between both two-level energy systems.Investigation on effects of pump intensities,polyester structures and thicknees of films has been also carried out.