Optical limiting of pentaazadentate complexes in solution for nanosecond pulses

Fengqi Guo; Wenfang Sun; Duo-Yuan Wang; Yinglin Song

doi:10.1117/1.1334948

1 January 2001 Optical limiting of pentaazadentate complexes in solution for nanosecond pulses

Fengqi Guo, Wenfang Sun, Duo-Yuan Wang, Yinglin Song

Optical Engineering, Vol. 40, Issue 1, (January 2001). https://doi.org/10.1117/1.1334948

Passive optical limiters are significant for protecting sensors and human eyes from high intensity laser. The selection of materials is still the key point for optical power limiters. The optical limiting performances have been measured for six new pentaazadentate metal complexes with initial linear transmission of 0.90 in a 2 mm cell in chloroform at 532 nm with 8 ns pulses, in which the reverse saturable absorption from the triplet?triplet excited state is responsible for the optical limiting. The optical limiting thresholds at T/T0 = 0.5 are 139 mJ/cm2, 350 mJ/cm2 and 420 mJ/cm2 for [(PMC-NO2)Cd]Cl, [(PMC-Np)Cd]Cl and [(PMC)Sm]Cl, respectively. The lowest nonlinear transmittance for [(PMC-NO2)Cd]Cl is 10%, while the incident maximum fluence reaches to 600 mJ/cm2. The ratios of T0/Tlim are estimated at 2.3 to 9.0. The limiting thresholds are strongly influenced by the nature of the substituents on the benzene ring and the heavy atom effect. Electron withdrawing groups of the complexes can enhance the limiting capability, and the heavy atom effect facilitates the decreasing of the limiting threshold.

©(2001) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Fengqi Guo, Wenfang Sun, Duo-Yuan Wang, and Yinglin Song "Optical limiting of pentaazadentate complexes in solution for nanosecond pulses," Optical Engineering 40(1), (1 January 2001). https://doi.org/10.1117/1.1334948

Published: 1 January 2001

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