Abstract Nonlinear refractive properties of chloroaluminum phthalocyanine (CAP) in ethanol solution are studied using the Z-scan technique with picosecond (ps) and nanosecond (ns) laser pulses at a wavelength of 532 nm. A transition from self-focusing to self-defocusing in CAP solution excited by 10 ns pulses is observed during the decrease of its concentration. This transition is due to co-existing excited-state refraction and transient thermal lensing effects. The experimental results are described very well using the rate-equation model and the theory of transient thermal refraction in liquids. The refractive cross sections of the excited-state are also obtained.
Received: 12 August 2008
Revised: 02 December 2008
Accepted manuscript online:
PACS:
42.65.Jx
(Beam trapping, self-focusing and defocusing; self-phase modulation)
Fund: Project supported
by the National Natural Science Fundation of China (Grant No
10104007), the Program for New Century Excellent Talents in
University, China (Grant No NCET-04-0333), and the Excellent
Youth Fund of Heilongjiang Province, China (Grant No JC-04-04).
Cite this article:
Yang Jun-Yi(杨俊义), Song Ying-Lin(宋瑛林), and Gu Ji-Hua(顾济华) Concentration dependent nonlinear refraction in chloroaluminum phthalocyanine/ethanol solution 2009 Chin. Phys. B 18 2828
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