Optical limiting of &#946;-octa-octyloxy-phthalocyanines for pecosecond pulses in solution

Yu Chen; Duoyuan Wang; Yunjing Li; Yuxin Nie

doi:10.1117/12.446352

14 February 2003 Optical limiting of β-octa-octyloxy-phthalocyanines for pecosecond pulses in solution

Yu Chen, Duoyuan Wang, Yunjing Li, Yuxin Nie

Proceedings Volume 4797, Multiphoton Absorption and Nonlinear Transmission Processes: Materials, Theory, and Applications; (2003) https://doi.org/10.1117/12.446352
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

The optical limiting performances for β-octa-octyloxy phthalocyanines with initial linear transmission T_o = 88% to approximately 92% at 532 nm in a 5 mm spectroscopic cell in toluene have been measured with 35 ps pulses, in which β-octa-octyloxy phthalocyanine free-base exhibits the strongest optical limiting ability through a reverse saturable absorption from S₁ → S_n excited singlet states with σ_s1 = 4.0 x 10^-17 cm². The optical limiting thresholds are 50, 130 and 140 mJ/cm² at T/T_o = 0.5 for phthalocyanine free base, nickel phthalocyanine, and lead phthalocyanine respectively. The throughput of the phthalocyanine free base is clamped down to 70 mJ/cm² with the limiting nonlinear transmittance T_lim = 18% as the incident fluence reaching to 400 mJ/cm². The solubility, aggregation behavior and photo-stability for β-octa-octyloxy phthalocyanines have been studied. The solubility of the β-octa-octyloxy phthalocyanines has an obvious improving, which dissolve in non-polar solvent more easily than in polar solvent. The aggregation equilibrium constant k = 5.6 x 10³ in toluene for phthalocyanine free base is lager that in mixed solvent (k' = 1.4 x 10³), which means that the β-octa-octyloxy phthalocyanines aggregate more easily in non-polar solvent than in polar solvent through the π-π interaction. The β-octa-octyloxy lead phthalocyanine appeared a lower photo-stability among them.

Citation Download Citation

Yu Chen, Duoyuan Wang, Yunjing Li, and Yuxin Nie "Optical limiting of β-octa-octyloxy-phthalocyanines for pecosecond pulses in solution", Proc. SPIE 4797, Multiphoton Absorption and Nonlinear Transmission Processes: Materials, Theory, and Applications, (14 February 2003); https://doi.org/10.1117/12.446352

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