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25 March 1999 Highly selective holographic elements for spectroscopic applications
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The goal of our research is to create the holographic optical element with high value of spectral selectivity, about 0.1 nm. The operating wavelength of the filter is determined by the particular task which it is made for, therefore this wavelength is usually different than the recording wavelength. The theoretical analysis was carried out to determine the requirement for such hologram recording in order to reach the maximal diffraction efficiency. The dependence the required refractive index modulation of the material on the reconstruction wavelength was calculated for both transmission and reflective recording schemes. Standard holographic materials can not be applied for the recording of the spectral filter with high selectivity, because the material thickness must be about millimeter. PDA photomaterial (polymer with diffusive amplification) was applied for recording of these holograms. Experimentally achieved bandwidth of the spectral selectivity contour is 0.5 nm. The dependence of the reconstructed wavelength on the angle of reconstruction for the experimentally obtained specimen was measured, and it occurred higher than for the ordinary diffraction grating. This makes thick holographic gratings recorded in PDA very promising from the point of view of their spectroscopic application as a wavelength demultiplexers in the communication networks and as an optical part of monochromator. The comparison of the characteristics of spectral filter and double monochromator was carried out. Another possible applications of the filter including its usage in solar investigations, stabilizing of laser sources, Raman spectroscopy are also discussed.
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Nadya O. Reingand, Irina V. Semenova, and Alexander Popov "Highly selective holographic elements for spectroscopic applications", Proc. SPIE 3637, Practical Holography XIII, (25 March 1999);

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