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Chin. Phys. B, 2009, Vol. 18(7): 2828-2834    DOI: 10.1088/1674-1056/18/7/034
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Concentration dependent nonlinear refraction in chloroaluminum phthalocyanine/ethanol solution

Yang Jun-Yi(杨俊义), Song Ying-Lin(宋瑛林), and Gu Ji-Hua(顾济华)
School of Physical Science and Technology, Soochow University, Suzhou 215006, China
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.
Keywords:  transient thermal lensing effect      Z-scan      excited-state refraction  
Received:  12 August 2008      Revised:  02 December 2008      Accepted manuscript online: 
PACS:  42.65.Jx (Beam trapping, self-focusing and defocusing; self-phase modulation)  
  42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)  
  42.70.Jk (Polymers and organics)  
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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