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Nonlinear optical response of liquid crystalline azo‐dendrimer in picosecond and CW regimes
Author(s) -
Zhang Xiaoqiang,
Wang Changshun,
Lu Xuemin,
Zeng Yi
Publication year - 2011
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.33489
Subject(s) - picosecond , materials science , excitation , dendrimer , birefringence , laser , polymer , nonlinear optics , optics , polymer chemistry , physics , composite material , quantum mechanics
The nonlinear optical response of the liquid crystalline multiarm star‐shaped azodendrimer was investigated in picosecond pulse and CW regimes at 532 nm. The polymer exhibited large nonlinear refractive coefficient in two regimes ( n 2 = −2.88 × 10 −13 cm 2 /W and −1.1 × 10 −10 cm 2 /W under picoseconds pulse excitation, whereas n 2 = −1.4 × 10 −6 cm 2 /W and n 2 = −8.8 × 10 −5 cm 2 /W under CW laser excitation in solution and film, respectively). The mechanism accounting for the process of nonlinear refraction was discussed. The value of photoinduced birefringence in the polymer film was also measured (Δ n ∼ 10 −3 ) under CW laser excitation at 532 nm. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011