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 AgCl1-xBrx(0≤x≤1) and, to the best of our knowledge, for the first time for the Ag0.95Tl0.05Br0.95I0.05 plate, manufactured by hot embossing, at 632.8 nm. We recorded their absorption spectra within the range of 0.19-41.67 μm using UV-Vis spectrophotometry and Fourier transform infrared spectroscopy, which demonstrated that the increase of substituent silver bromide or thallium monoiodide mole fraction in the corresponding solid solution causes the optical density to grow. As the result it moves the transmission edges toward longer wavelengths, while slightly reducing the transmission peak.
Photonic crystalline IR fibers for the spectral range of 2-40 μm.
Monocrystals of Ag(1-x)Tl(x)Br(1-x)I(x) and Ag(1-x)Tl(x)Cl(y)I(z)Br(1-y-z) for the spectral range from 2.0 to 40.0 μm with improved photostability were developed and grown. The grown crystals were used for fabrication of single-mode IR fibers. Experimental studies of optical properties of these fibers have confirmed their single-mode operation at CO2 laser wavelength and demonstrated wider mode field for microstructured fiber compared to fibers with conventional double-layered structure.
Influence of the form of the illuminating beam upon the error of length measurements made with a laser-type Michelson interferometer
ConclusionsBy solving the problem of the interference of Gaussian beams, we obtained formulas for the calculation of the systematic error which is made when a laser-type Michelson interferometer is used to measure length. We gave recommendations on the geometrical dimensions of the Michelson interferometer and its matching to the laser radiation so that the above error is reduced. We have described the experimental verification of our formulas.