Nonlinear optical absorption of a metal dithiolene complex irradiated by different laser pulses at near-infrared wavelengths

• DOI: 10.1016/j.cplett.2006.12.057
• Publication Date: 2006-12-22T17:35:16Z
• Authors: W.F. Guo; X.B. Sun; J. Sun; X.Q. Wang; G.H. Zhang; Q. Ren; D. Xu
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract Nonlinear optical (NLO) absorption of a metal dithiolene complex, [(C 2 H 5 ) 4 N][Ni(dmit) 2 ] has been studied by open-aperture (OA) Z-scan technique under irradiation with 15 ns and 1 ns laser pulses at 1053 nm and 40 ps laser pulses at 1064 nm. Distinct excited-state absorption behaviors were observed: a reverse saturable absorption (RSA) for 15 ns while a saturable absorption (SA) for 1 ns and 40 ps laser pulses, and the SA for 1 ns laser pulses was stronger than that for the latter. The mechanism responsible for the results with different laser pulses is analyzed using a five energy-level diagram.