Femtosecond measurement of the third order nonlinear optical coefficients of CuPc (copper phthalocyanine), CoPc (cobalt phthalocyanine) and ZnPc (zinc phthalocyanine) thin films using Z-scan measurement method

M. J. Shin, J. W. Wu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

The Z-scan measurement method possessing the simplicity of the experiment set-up as well as the simplicity of the interpretation separately determines the nonlinear changes in index and absorption and has the high sensitivity to all nonlinear optical mechanisms. Thus we performed the experiment, varying a repetition rate at 82MHz, 4MHz, 800kHz and 400kHz with a pulse selector in the laser system. We found that the larger the repetition rate was, the more dominant the thermal nonlinearity was in both the nonlinear changes in index and absorption. At the 4OOkHz and 800kHz repetition rate where the samples didn't show thermal nonlinearity, we compared the experiment results with the theory derived from GD(Gaussian decomposition)method[ 11. At the 4MHz and 82MHz repetition rate where the thermal nonlinearity was dominant we explain the experiment results both qualitatively and quantitatively. The samples were irradiated by Ti-sapphire femtosecond laser with pulse widths of FWHM 100-200 fs. The samples employed for the measurement were CuPc(Copper Phthalocyanine), CoPc(Coba1t Phthalocyanine) and ZnPc(Zinc Phthalocyanine) , fabricated in a thin film by a vacuum evaporation. These have a response time of f s order due to electronic distortion and have widely used as a saturable absorber. Near the resonant absorption of &-band(& 750nm) in CuPc molecule the nonlinear absorption coefficient is121 α=α01+1/1=α0-α0/1s1=α0+β1(-α0/1s=β).

Original languageEnglish
Title of host publicationCLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages867-868
Number of pages2
ISBN (Electronic)0780356616, 9780780356610
DOIs
StatePublished - 1999
Event1999 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 1999 - Seoul, Korea, Republic of
Duration: 30 Aug 19993 Sep 1999

Publication series

NameCLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics
Volume3

Conference

Conference1999 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 1999
Country/TerritoryKorea, Republic of
CitySeoul
Period30/08/993/09/99

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