Measurement of Two-Photon Absorption Cross Section of Metal Ions by a Mass Sedimentation Approach

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作者：
Zhuo-Chen Ma
Qi-Dai Chen
Bing Han
Xue-Qing Liu
Jun-Feng Song
Hong-Bo Sun
机构：
[1] State Key Laboratory on Integrated Optoelectronics,
[2] College of Electronic Science and Engineering,undefined
[3] Jilin University,undefined
[4] College of Physics,undefined
[5] Jilin University,undefined
来源：
Scientific Reports | / 5卷
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摘要：
The photo-reduction of metal ions in solution induced by femtosecond laser is an important and novel method for fabricating three-dimensional metal microstructures. However, the nonlinear absorption cross section of metal ions remains unknown because its measurement is difficult. In the present study, a method based on Two-Photon Excited Sedimentation (TPES) is proposed to measure the two-photon absorption cross section (TPACS) of metal ions in solution. The power-squared dependence of the amount of sediment on the excitation intensity was confirmed, revealing that 800 nm femtosecond laser induced reduction of metal ions was a two photon absorption process. We believe that the proposed method may be applied to measure the TPACS of several metal ions, thereby opening a new avenue towards future analysis of two-photon absorption materials.
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