Two-Photon Absorption Measurements in PDA (12, 8) Waveguides

Akimasa KANEKO  Akira ITO  Osamu FURUKAWA  Tatsuo WADA  Hiroyuki SASABE  Keisuke SASAKI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E77-C   No.5   pp.700-703
Publication Date: 1994/05/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Organic Functional Devices)
Category: 
Keyword: 
two-photon absorption,  polydiacetylene (12,8),  mode-locked Ti: Sapphire laser,  slab waveguide,  

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Summary: 
We report the dispersion of two-photon absorption (TPA) coefficient, (β), in polydiacetylene (12, 8) thin film waveguides in the wavelength range less than the one-photon band-gap with a 100 femtosecond mode-locked Ti: Sapphire laser pulses. The TPA coefficient was found to be 4 cm/GW for TE polarization at 900 nm (1.38 eV) by taking into account a Gaussian intensity distribution as well as a temporal pulse shape. We observed a sharp resonance in β above the first one-photon allowed transition with a full width at half maximum (FWHM) of 90 meV.