Dmitro Sofronov | Searcharxiv

arXiv2026

Zinc selenide single crystals co-doped with active TM-ions of chromium, cobalt and iron

The development of laser materials with absorption/emission spectra in the atmospheric transparency band 2-5 microns is of great interest for modern applications. Triple-doped zinc selenide crystals activated with chromium, cobalt, and iron ions were grown by the vertical Bridgman method under high argon pressure. Comparative X-ray diffractometry, infra-red spectroscopy, and other studies of grown crystals were conducted. Features of their growth, morphology, and optical properties related to the crystal structure were discovered.

cond-mat.mtrl-sci↗

arXiv2023

Advanced Cd1-xMnxTe:Fe2+ semiconductor crystals with linear sin-band redshift of absorption and emission spectra

Doped semiconductor crystals of solid solution $Cd_{1-x}Mn_{x}Te:Fe^{2+}$ were grown by the high-pressure Bridgman method covering the range of its existence as a zinc blende crystal structure. The concentration of Fe-impurities was approximately 0.001 wt.% in all studied samples. The correlations between the composition of solid solution crystals of $Cd_{1-x}Mn_{x}Te:Fe^{2+}$, band gap, lattice period and the maxima positions of the $Fe^{2+}$ active ion absorption and emission spectra were found. A new theoretical model based on the principle of additivity for solid solution semiconductor materials has been used for explaining the long-wavelength ''redshift'' of absorption and luminescence bands in the spectra of $Cd_{1-x}Mn_{x}Te:Fe^{2+}$ crystals with increasing solid solution concentration. The obtained results can be used to predict the lasing range for $Cd_{1-x}Mn_{x}Te:Fe^{2+}$ crystal media (in all possible $Mn$ concentrations), which is potentially the longest wavelength active material for mid-IR lasing.

cond-mat.mtrl-sci↗