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1

New design of interference band-pass infrared filter

Yaremchuk I. Y., Fitio V. M., Bobitski Y. V.

Opto-Electronics Review

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2011

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Vol. 19, No. 2

193-197

EN

The new design of the interference band-pass infrared filters is proposed. The analytic expressions for the analysis structure "layer with the high refractive index - interference mirror - layer with the high refractive index" are obtained. The refractive indices optimal and thicknesses of individual layers that limited interference mirror are obtained.

2

Optical demultiplexer using for POF-WDM systems

Bartkiv L. V., Bobitski Y. V., Poisel H.

Optica Applicata

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2005

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Vol. 35, nr 1

59-66

EN

Polymer optical fiber (POF) in one of the best transmission media for shortidistance communications. To increase the transmission capacity of the fiber a wave lenght-division-multiplexing (WDW) technique is commonly used. Several POF-WDW systems have been realized using interference filters and plane diffraction gratings as wavelenght selective elements. In the present paper, for the first time a concave diffration grating is applied with POF. A holographic concave grating is calculated and optimized for the use in an optical demultiplexer. The optical losses in the designed demultiplexer are estimated theoretically.

3

Photoelastic propertiesof the beta barium borate crystals

Andrushchak A. S., Bobitski Y. V., Kaidan M. V., Adamiv V. T., Burak Y. V., Mytsyk B. G.

Optica Applicata

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2003

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Vol. 33, nr 2-3

345-357

EN

The single crystals of the beta barium borate were grown by the top-seeded solution method. For these crystals all the components of piezooptic effect tensor were determined by a two-fold measurement method. Based on this method some magnitudes of elastic compliance coefficients were fixed. The magnitudes and signs of all elastooptic coefficients were also calculated, acoustic quality parameter was analysed and the possibility of using the beta barium borate crystals as perspective acoustooptic material was discussed.

4

Diffraction of a plane TM-polarized optical wave on a non-absorbing medium with a periodic dielectric permeability variation

Fitio V. M., Bobitski Y. V.

Optica Applicata

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2003

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Vol. 33, nr 2-3

237-249

EN

Taking advantage of the coupled waves method, a system of linear differential equations with constant coefficients has been obtained which describes the diffraction of a plane TM-polarized optical wave on a grating. The electric field strength was used as a variable. For such a choice of a variable, only the coupling between the adjacent coupled waves appears in the system of equations, which results in a substantial simplification of the system.

5

Multi-layered holograms and their fabrication

Fitio V.M., Bobitski Y.V.

Optica Applicata

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2001

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Vol. 31, nr 4

769-780

EN

Multi-layered holograms due to their multi-beam interference have other features contrary to usual bulk holograms. Analysis of the properties of such holograms is provided by coupled waves method. For two-layered holograms we can see oscillations of the dependence of diffraction efficiency on an angle incident onto a hologram or on the wavelength of incident beam, and besides oscillation period is defined mainly by the distance between holograms. Multi-layered holograms could be presented as two-dimensional periodic structures, for which variable of the dielectric constant (variable component of refractive index) could be shown as multiplication of two periodical functions.