Advanced rutile-made acousto-optical cell designed for precise parallel optical spectrum analysis in ultrahigh-frequency regime of the noncollinear two-phonon light scattering

We present an original approach to precise optical spectrum analysis based on combining the nonlinear acousto-optical processing with the cross-disperser technique. This novelty gives us a possibility to overlap all the visible range by the parallel analysis with a gained spectral resolution. For this goal, an advanced rutile-made acousto-optical cell has been designed and tested as dynamic acoustic grating at ultrahigh-frequency to provide the needed slit density to increase the resolving power and the nonlinear apodization to improve the profile of a resolvable spot. Theoretical estimations were developed for low-loss 6-cm rutile-crystal at lambda = 440 nm, and they show that one can expect the spectral resolution 0.0609 angstrom, resolving power 72,250, and the number of resolvable spots similar to 39,200. The illustrative proof-of-principle experiments with that rutile-crystal-made acousto-optical cell have been carried out. Experimentally we have obtained the spectral resolution similar to 0.0815 angstrom and resolving power similar to 54,000. (c) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)