Тип публикации: статья из журнала
Год издания: 2001
Идентификатор DOI: 10.1070/QE2001v031n10ABEH00072
Ключевые слова: nonlinear refraction; silver hydrosol; self-defocusing, Nonlinear refraction, Self-defocusing, Silver hydrosol
Аннотация: The relation between the degree of aggregation of silver hydrosols and their nonlinear refractive index n(2) is studied experimentally. It is found that the sign Of n(2) at a wavelength of 1.064 mum changes with increasing the aggregation degree, which corresponds to the replacing of self-focusing by self-defocusing. The observed effects are explained based on the analysis of a change in nonlinear dispersion of the medium, taking into account the interaction between phases and the photochromic effects, which are typical for colloidal structures with fractal geometry. It is shown that the change in the sign of the nonlinear refractive index of hydrosols upon irradiation by laser pulses of duration of less than 10(-7) s is caused by the perturbation of resonances of silver and water and by the competition between Kerr nonlinear polarisations involving these resonances.
Журнал: Quantum Electronics
Выпуск журнала: Vol. 31, Is. 10
Номера страниц: 904-908
ISSN журнала: 10637818
Место издания: Letchworth
Издатель: Turpion LTD
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