Peculiarities of Forming a Multiband Transmission Function Based on Multifrequency Acousto-Optic Diffraction
- Russian Academy of Sciences, Kotel’nikov Institute of Radio Engineering and Electronics, Fryazino Branch (Russian Federation)
An analytical solution for the transmission function of noncoherent wideband radiation is obtained under acousto-optic (AO) filtering using a discrete set of monochromatic AO waves with a small spectral overlap. We studied characteristics of the AO transformation of a continuous spectrum of noncoherent radiation into a given set of discrete narrow bands of spectral transmission by excitation of a discrete set of sound frequencies. We carried out the analysis of transmission functions of individual channels taking into account a partial overlap of their spectra and possible intermodulation distortions. It is shown that a stationary value of the root-mean-square light power is found at the electronic output due to the photoelectric transformation and detecting diffracted light. Based on this, a necessary stationary, multiband, and nearly equidistant transmission function of a device can be formed by using a relevant spectrum of acoustic excitation. Peculiarities of this way of forming the multiband transmission function are revealed: the limitation of diffraction efficiency for an individual channel, the possibility of decoupling side lobes of adjacent channels, etc. A multiband acousto-optic filter (MAOF) was simulated that was based on a paratellurite monocrystal (TeO{sub 2}), which was previously used for experimental optical encoding. The theoretical and experimental results are in gratifying agreement.
- OSTI ID:
- 22786565
- Journal Information:
- Optics and Spectroscopy, Vol. 124, Issue 1; Other Information: Copyright (c) 2018 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0030-400X
- Country of Publication:
- United States
- Language:
- English
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