中国物理B ›› 2009, Vol. 18 ›› Issue (7): 2828-2834.doi: 10.1088/1674-1056/18/7/034

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Concentration dependent nonlinear refraction in chloroaluminum phthalocyanine/ethanol solution

杨俊义, 宋瑛林, 顾济华   

  1. School of Physical Science and Technology, Soochow University, Suzhou 215006, China
  • 收稿日期:2008-08-12 修回日期:2008-12-02 出版日期:2009-07-20 发布日期:2009-07-20
  • 基金资助:
    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).

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)   

  1. School of Physical Science and Technology, Soochow University, Suzhou 215006, China
  • Received:2008-08-12 Revised:2008-12-02 Online:2009-07-20 Published:2009-07-20
  • Supported by:
    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).

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摘要： 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.

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.

Key words: transient thermal lensing effect, Z-scan, excited-state refraction

中图分类号:  (Beam trapping, self-focusing and defocusing; self-phase modulation)

  • 42.65.Jx
42.65.Re (Ultrafast processes; optical pulse generation and pulse compression) 42.70.Jk (Polymers and organics)