Voit Kay-Michael, Imlau Mirco
School of Physics, Osnabrück University, Barbarastr. 7, Osnabrück 49069, Germany.
Materials (Basel). 2013 Jan 23;6(1):334-358. doi: 10.3390/ma6010334.
Holographic spectroscopy is highlighted as a powerful tool for the analysis of photosensitive materials with pronounced alterations of the complex permittivity over a broad range in the visible spectrum, due to the advances made both in the fields of advanced holographic media and highly tunable lasers systems. To analytically discuss consequences for in- and off-Bragg reconstruction, we revised Kogelnik's coupled wave theory strictly on the basis of complex permittivities. We extended it to comply with modern experimental parameters such as out-of-phase mixed holograms and highly modulated gratings. A spatially modulated, wavelength-dependent permittivity that superimposes a spatially homogeneous wavelength-dependent ground state spectrum is taken into account for signal wave reconstruction with bulky elementary mixed gratings as an example. The dispersion characteristics of the respective diffraction efficiency is modelled for color-center-absorption and absorption of strongly localized carriers. As an example for the theoretical possibilities of our newly derived set of equations, we present a quantitative analysis of the Borrmann effect connected to out-of-phase gratings, providing easier and more intuitive methods for the derivation of their grating parameters.
由于先进全息介质和高度可调谐激光系统领域取得的进展，全息光谱法被视为一种强大的工具，用于分析在可见光谱的广泛范围内具有复介电常数显著变化的光敏材料。为了分析布拉格内和布拉格外重建的结果，我们严格基于复介电常数对科格尔尼克耦合波理论进行了修正。我们对其进行了扩展，以符合诸如异相混合全息图和高度调制光栅等现代实验参数。以大块基本混合光栅为例，在信号波重建中考虑了叠加空间均匀波长相关基态光谱的空间调制、波长相关介电常数。针对色心吸收和强局域载流子的吸收，对各自衍射效率的色散特性进行了建模。作为我们新推导的方程组理论可能性的一个例子，我们对与异相光栅相关的博尔曼效应进行了定量分析，为推导其光栅参数提供了更简便、更直观的方法。
