Autor: Kotačka, L. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Spatially Modulated Bragg Gratings
Autorzy:: Procházka, I.
Kotac̆ka, L.
Petrás̆, F.
Powiązania:: https://bibliotekanauki.pl/articles/2008273.pdf
Data publikacji:: 1999-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 42.70.Dj
Opis:: A set of coupled mode differential equations which describe the light propagation in an optical fiber containing a photoinduced Bragg grating is derived. Reflection spectra based on numerical solution to these equations are presented when basic grating parameters are varied. In addition, the influence of these parameters on the maximum reflectivity and 3 dB bandwidth is examined. Finally, reflection spectra of the chirped grating and the grating with spatially modulated refractive index changes are discussed.
Źródło:: Acta Physica Polonica A; 1999, 95, 5; 821-835
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Čerenkov Waveguide SHG: a Less Critical Way to Reach the Efficiency Peak
Autorzy:: Kotačka, L.
Čtyroký, J.
Hoekstra, H. J. W. M.
Powiązania:: https://bibliotekanauki.pl/articles/2015113.pdf
Data publikacji:: 2001-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 42.65.Ky
42.82.Et
Opis:: It is well known that the conversion efficiency of the SHG in the Čerenkov regime in a waveguide with a nonlinear substrate exhibits a very sharp peak. Its position in a "pump wavelength-guide thickness" diagram follows a modified dispersion relation. A particular material combination exactly determines both the pump wavelength and the guide thickness. The existence of the peak was also experimentally proved with relatively high normalised conversion efficiency of 210%/(cm W). However, in order to achieve such a high conversion efficiency, the required tolerance in the guide thickness should be smaller than 0.5 nm (the FWHM of the peak is approximately 0.8 nm). The allowed variations in refractive indices are also very low (<10$\text{}^{-3}$). The recent theoretical study of the authors showed that an additional layer (idler) inserted into the waveguide facilitates more degrees of freedom which could relax the conditions for reaching the efficiency peak. This paper presents a detailed study of the behaviour of four-layer waveguide devices with a nonlinear substrate which promise a less constrained way to reach the efficiency peak.
Źródło:: Acta Physica Polonica A; 2001, 99, 1; 135-146
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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