I want better understand spectral filtering and multiplexing processes. Which spectral filters are you know and can recommend? What are their advantages and disadvantages in relation to the others spectral filters? Relevant references are welcome. Thank you in advance!
Look at Faraday atomic filters. They principle of operation is similar to Lyot filter but instead of birefringent material in between polarizer there is atomic medium. Atoms near resonances also rotate the polarization. By tuning atomic density you can obtain differenct transmitions spectra.
http://linkinghub.elsevier.com/retrieve/pii/S0030401804000070
http://en.wikipedia.org/wiki/Atomic_line_filter
For realization of Spectral Imaging can be used as methods of a direct optical filtration of the accepted radiation by means of the reconstructed optical filters of different types (optical-acoustic, interferential, interferential and polarizing, etc.), and the methods of allocation of spectral images based on computer processing of the optical fields registered by the matrix receiver (for example, signals after Fourier – the interferometer, holograms, etc.) [1 - 38]:
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There are tunable filters based on liquid crystal. You can find it in the market. The idea is to select different wavelengths by changing the orientation of the LC director applying voltage.
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