Ms. Wei Lian Tan Profile

Wei Lian Tan

Lecturer at Ngee Ann Polytechnic

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Proceedings Article | 9 November 1999 Paper

Optical limiting properties of neutral nickel dithiolenes

Wei Lian Tan, Wei Ji, Jing Zuo, Jun Bai, Xiao You, Jin Lim, Sidney Yang, David Hagan, Eric Van Stryland

Proceedings Volume 3899, (1999) https://doi.org/10.1117/12.369436

KEYWORDS: Picosecond phenomena, Absorption, Nickel, Transmittance, Optical limiting, Refraction, Visible radiation, Sensors, Data modeling, Optical sensors

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Wide applications of lasers have stimulated a great interest in development of optical limiting devices. These devices can be used to protect optical sensor form laser-induced damage because their transmission is high when they are exposed to low-power laser light, and their transmission becomes low when irradiated by intense laser beams. Here we report such a device based on nonlinear optical effects in two neutral nickel complexes with multi-sulfur 1,2 dithiolene ligands, 1 and 2. The limiting device consisted of a focusing setup and a 1-mm-thick cell, which contained a benzene solution of one of the complexes. THe limiting properties were investigated by both nanosecond and picosecond laser pulses. At 532 nm, the limiting thresholds of complexes 1 and 2 measured by the picosecond laser pulses. At 532 nm, the limiting threshold of complexes 1 and 2 measured by the picosecond laser pluses with a focusing geometry were determined to be approximately 0.3 J/cm². The linear absorption spectra of the to complexes also indicated that their limiting response should cover the visible and near-IR region. All these result show their limiting performance is superior to the limiting effecting C₆₀. Picosecond time-resolved pump-probe and Z-scan experiments revealed that the observed limiting effects should originate from excited-state absorption and refraction.

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