SPECTRAL PROPERTIES OF A CASCADE REFLECTIVE HOLOGRAPHIC GRATINGS SEPARATED BY A HOMOGENEOUS LAYER
E. F. Pen1,2, M. Yu. Rodionov1, P. A. Chubakov1
1Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, pr. Akademika Koptyuga 1
2Novosibirsk State Technical University, 630073, Novosibirsk, pr. K. Marksa, 20
Keywords: спектральные интерференционные приборы, многослойные голографические структуры, spectral interference devices, multi-layer holographic structures
Abstract
This paper presents the results of experimental studies of the spectral properties of layered structures consisting of two volume reflective holographic gratings separated by an optically homogeneous layer. When such structures are exposed to polychromatic light, the interference interaction of the waves formed by these gratings leads to the formation of a plurality of narrow spectral passbands. The period of arrangement of the passbands is determined by the optical thickness of the intermediate layer, and their envelope coincides with the spectral selectivity contour of one grating. The existence of this type of spectra with local passbands arranged at a periodicity 2-8 Å (in different experiments) has been experimentally confirmed. A high-resolution Ramanor U1000 spectrometer and an optical Fabry-Perot interferometer were used. It is found that the irregularities in the internal structure of the holographic gratings due to the imperfection of the recording medium substantially distort the spectral characteristics of the studied structures in comparison with their simple theoretical models: the spectrum is asymmetric and the local bandwidth is significantly less than the estimated value. Similarity between experimental data and simulation results is achieved by selecting the parameters of said irregularities.
|
