Nonlinear refraction of silver hydrosols during their aggregation

Journal Article · Wed Oct 31 00:00:00 EST 2001 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2001V031N10ABEH002072· OSTI ID:21442854

Karpov, S V ^[1]; Kodirov, M K; Ryasnyansky, A I ^[2]; Slabko, V V ^[3]

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1. L.V. Kirenskii Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Academgorodok, Krasnoyarsk (Russian Federation)
2. A. Navoi Samarkand State University, Samarkand (Uzbekistan)
3. Krasnoyarsk State Technical University, Krasnoyarsk (Russian Federation)

The relation between the degree of aggregation of silver hydrosols and their nonlinear refractive index n{sub 2} is studied experimentally. It is found that the sign of n{sub 2} at a wavelength of 1.064 {mu}m 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{sup -7} s is caused by the perturbation of resonances of silver and water and by the competition between Kerr nonlinear polarisations involving these resonances. (nonlinear optical phenomena and devices)

• OSTI ID: 21442854
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Vol. 31, Issue 10; Other Information: DOI: 10.1070/QE2001v031n10ABEH002072; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AGGLOMERATION
DISPERSIONS
DISTURBANCES
LASER RADIATION
NONLINEAR PROBLEMS
POLARIZATION
PULSES
REFRACTION
REFRACTIVE INDEX
RESONANCE
SILVER
WATER
WAVELENGTHS
ELECTROMAGNETIC RADIATION
ELEMENTS
HYDROGEN COMPOUNDS
METALS
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
TRANSITION ELEMENTS