Abstract
Photopolymer recording materials are nowadays widely used for recording of diffraction gratings and other diffraction elements. For obtaining the best performance of these diffraction gratings for desired applications, it is important to assess these gratings from many different perspectives. In this contribution, we present an experimental and characterization approach to an analysis of diffraction gratings recorded into photopolymer materials. This approach is able to provide a complex and very illustrative description of these gratings response and, with accordance to the theory, information about some important grating parameters, such as a spatial period, slant angle, etc., as well. This approach is based on the measurement of a grating response for a wide range of angles and wavelengths and then on the construction and subsequent analysis of maps in the angular-spectral plane. It is shown that the measurements are in a good agreement with the theoretical predictions based on either approximate (Kogelnik’s coupled wave theory) or rigorous (RCWA) techniques and that this approach provides complex and detailed characterization of the grating response which can be used for additional optimization or decision of applicability of measured sample gratings.
Highlights
IntroductionFor recording of information coded into an interference pattern, wide range of different materials can be used
For recording of information coded into an interference pattern, wide range of different materials can be used. One class of these recording materials are photopolymer based materials where the storing of information is done by a light induced polymerization of monomers [1]
For the analysis of these effects in volume phase gratings, we have developed a complex method for grating parameters characterization and extraction
Summary
For recording of information coded into an interference pattern, wide range of different materials can be used One class of these recording materials are photopolymer based materials where the storing of information is done by a light induced polymerization of monomers [1]. These recording materials based on polymerization of primary units (monomers) were studied to a great extend - theoretically (description of the grating formation [2]–[4], approach to the description of wide range of properties [5]–[7], etc.) and experimentally (material composition [8]–[11], measurement of parameters [12]–[15], etc.). As we suppose that the volume grating has only limited number of orders (ideally, only the first and zeroth order) and the grating is illuminated with white light, we can obtain from the measurement of the transmitted light (the zeroth order) for different incident angles a map characterizing angular and spectral behavior of the thick grating
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