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High-repetition rate femtosecond laser radiation was utilized to improve surface quality of metal parts manufactured by laser additive techniques. This novel approach can be used to postprocess parts made of heat-sensitive materials, and to attain the designed net shape with micrometer precision.

Organic-inorganic hybrid perovskites (OIHs) are exceptionally promising sector of novel materials for optoelectronic applications. Herein, the OIHs of the formula [(NH3)2(CH2)3]CuCl4 labeled by C3CuCl and [(NH3)2(CH2)4]CuCl2Br2 labeled by C4CuClBr are prepared by slow evaporation method. The synthesis process is achieved by mixing equimolar ethanolic solutions ratios (1:1) of their basic components (organic/inorganic). Characterizations of these materials using microchemical analysis, energy dispersion X-ray (EDX) and X-ray diffraction (XRD) are discussed. The XRD is used to estimate the crystalline size for prepared compounds and found in the range of 38.8 and 48.8 nm for C3CuCl and C4CuClBr, respectively. The vibrational spectra are studied by Fourier transformation infrared spectroscopy (FTIR) and show the major diffraction peaks of compounds and their assignment. UV-region strong absorption is clarified in the optical properties studied for Cu hybrid, whereas the bandgap energy estimated via Kubelka-Munk equation and found 2.8 and 3.85 eV for C3CuCl and C4CuClBr, respectively. [ABSTRACT FROM AUTHOR]

In this work, we substituted rod lenses by the cylindrical body of clear plastic Light Emitting Diodes (LEDs), as a cheap laser line shaping optical element, for physics classroom demonstrations and experiments. A laser pointer was used to test three different LEDs, to reveal the correlation between their diameters and the beam fan angle. The results show that the performance of the LED body with smaller diameter was the best in terms of maximum laser line length. This application is useful in pedagogic activities, low cost optical designs, large field automotive shadowgraphy and non-Doppler laser shadow vibrometry of incandescent linear objects. [ABSTRACT FROM AUTHOR]

In this work the crystal structure by single crystal X‐ray measurement and optical properties of 1D propane‐1,2‐diammonium pentachlorobismuthate [NH3CH2CH(NH3)CH3]BiCl5 organic–inorganic hybrid perovskite are presented. It is prepared by mixing ethanolic solution of equimolar ratios (1:1) of its basic components. The title compound crystallized in the noncentrosymmetric orthorhombic space group Pca21 with Z = 8 molecules per unit cell. The unit‐cell parameters are a = 19.8403 (7) Å, b = 6.3303 (2) Å, c = 19.0314 (7) Å. The vibrational spectra are studied by Raman and infrared spectroscopy. The optical properties show a strong absorption in the ultraviolet region, the band gap energy Eg is found to be 3.15 eV. Cathodoluminescence measurements are also discussed. [ABSTRACT FROM AUTHOR]