Nonlinear optical absorption of [(C2H5)4N]2Cu(dmit)2 irradiated by picosecond and nanosecond laser pulses

✍ Scribed by F.J. Zhang; W.F. Guo; X.B. Sun; Q. Ren; Y. Gao; H.L. Yang; G.H. Zhang; Y.T. Chow; D. Xu

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 124 KB
• Volume: 4
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.200610088

✦ Synopsis

Nonlinear optical absorption of [(C~2~H~5~)~4~N]~2~Cu(dmit)~2~(dmit^2-^=4,5-dithiolate-1,3- dithiole-2-thione), abbreviated as EtCu, dissolved in acetone has been investigated by open-aperture Z-scan technique with picosecond and nanosecond laser pulses in the near infrared region. Under irradiation with 40 ps laser pulses at 1064 nm, two-photon absorption is observed and the two-photon absorption coefficient β~TPA~is (5.8±0.3)×10^-13^m/W. While excited by 15 ns laser pulses at 1053 nm, the sample presents a strong reverse saturable absorption and its nonlinear absorption coefficient β~RSA~is as high as (1.7±0.1)× 10^-10^m/W. The mechanism responsible for the difference between the results is analyzed. All the results suggest that this material may be a promising candidate for the application to optical limiting in the near infrared waveband.