期刊
OPTICS COMMUNICATIONS
卷 251, 期 4-6, 页码 429-433出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2005.03.003
关键词
nonlinear absorption; saturable absorption; reverse saturable absorption; nanoparticle; Z-scan
类别
The optical nonlinear absorption of the aqueous solution of platinum nanospheres protected by poly (N-vinyl-2-pyrrolidone) was investigated using open aperture Z-scan method with nanosecond pulse laser at the wavelength of 532 run. A shift from saturable absorption to reverse saturable absorption was observed at higher input pump intensities. The transition process was analyzed using a phenomenological model based on nonlinear absorption coefficient and saturation intensity. (c) 2005 Elsevier B.V. All rights reserved.
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