Indium iodide single crystal: breakthrough material for infrared acousto-optics.

Measurements of the refractive indices and the full set of longitudinal acousto-optical figures of merit in an orthorhombic single-crystal indium iodide (InI) were carried out. The high acousto-optic characteristics ( up to 1100×10) and strong optical anisotropy (=0.47) make it possible to design various types of high-performance acousto-optic devices of the middle and far-infrared spectral range.

Investigating the optical properties of polycrystalline AgCl(1-x)Br(x) (0≤x≤1) and Ag(0.95)Tl(0.05)Br(0.95)I(0.05) for IR engineering.

Using the Michelson technique we measured the refractive indices for the plane-parallel thin plates made of AgClBr(0≤x≤1) and, to the best of our knowledge, for the first time for the AgTlBrI plate, manufactured by hot embossing, at 632.8 nm. We recorded their absorption spectra within the range of 0.