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Analysis of restriction factors of widening diffraction bandwidth of multilayer dielectric grating 下载免费PDF全文
In order to design a multilayer dielectric grating with wide-bandwidth diffraction spectrum, the restriction factors of both the reflection bandwidth of multilayer dielectric high-reflectivity mirror and the guided-mode resonance phenomenon are studied in detail. The reflection characteristics of high-reflectivity mirror in zeroth and 1st transmitted diffraction orders are quantitatively evaluated. It is found that the reflection bandwidth of high-reflectivity mirror in 1st transmitted diffraction order, which determines the final diffraction bandwidth of multilayer dielectric grating, is evidently compressed. Furthermore, it is demonstrated that the reducing of grating period is an effective approach to the elimination of guided mode resonance over a required broad band range both spectrally and angularly. In addition, the expressions for calculating the maximum period ensuring no guided mode resonance in the required bandwidth are derived. Finally, two high-efficiency pulse-compression gratings with broad-band are presented. 相似文献
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Study on guided-mode resonance characteristic of multilayer dielectric grating with broadband and wide using-angle 下载免费PDF全文
Guided-mode resonance in a diffraction band of multilayer
dielectric gratings may lead to a catastrophic result in laser
system, especially in the ultrashort pulse laser system, so the
inhibition of guided-mode resonance is very important. In this paper
the characteristics of guided-mode resonance in multilayer
dielectric grating are studied with the aim of better understanding
the physical process of guided-mode resonance and designing a
broadband multilayer dielectric grating with no guided-mode
resonance. By employing waveguide theory, all guided-wave modes
appearing in multilayer dielectric grating are found, and the
incident conditions, separately, corresponding to each guided-wave
mode are also obtained. The electric field enhancement in multilayer
dielectric grating is shown obviously. Furthermore, from the
detailed analyses on the guided-mode resonance conditions, it is
found that the reduction of grating period would effectively avoid
the appearing of guided-mode resonance. And the expressions for
calculating maximum periods, which ensure that no guided-mode
resonance occurs in the requiring broad angle or wavelength range,
are first reported. The above results calculated by waveguide theory
and Fourier mode method are compared wit each other, and they are
coincident completely. Moreover, the method that relies on waveguide
theory is more helpful for understanding the guided-mode resonance
excited process and analyzing how each parameter affects the
characteristic of guided-mode resonance. Therefore, the effects of
multilayer dielectric grating parameters, such as period, fill
factor, thickness of grating layer, {\it et al.}, on the guided-mode
resonance characteristic are discussed in detail based on waveguide
theory, and some meaningful results are obtained. 相似文献
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