Dr. Ozarfar Gafarov Profile

Dr. Ozarfar Gafarov

Laser Scientist at Industrial Laser Machines, LLC

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Publications (7)

Proceedings Article | 13 March 2019 Presentation

Excitation of Fe(2+) ions via Cr(2+)->Fe(2+) and Co(2+)->Fe(2+) energy transfer in co-doped chalcogenide laser crystals (Conference Presentation)

Vladimir Fedorov, Tristan Carlson, Ozarfar Gafarov, Sergey Mirov

Proceedings Volume 10896, 108961F (2019) https://doi.org/10.1117/12.2511775

KEYWORDS: Ions, Energy transfer, Iron, Chalcogenides, Laser crystals, Chromium, Absorption, High power lasers, Laser systems engineering, Transition metals

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Proceedings Article | 14 May 2018 Presentation

Recent progress in mid-IR materials and lasers based on Cr and Fe doped chalcogenides (Conference Presentation)

Sergey Mirov, Igor Moskalev, Sergey Vasilyev, Viktor Smolski, Mike Mirov, Vladimir Fedorov, Dmitri Martyshkin, Andrey Zakrevsky, Ozarfar Gafarov, Jeremy Peppers, Valentin Gapontsev

Proceedings Volume 10637, 106370V (2018) https://doi.org/10.1117/12.2306528

KEYWORDS: Mid-IR, Chromium, Iron, Chalcogenides, Laser spectroscopy, Absorption, Diffusion, Oscillators, Transition metals, Ions

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Proceedings Article | 15 February 2018 Presentation + Paper

Grain growth and significant Fe diffusion in polycrystalline ZnS at elevated temperatures and pressures

Ozarfar Gafarov, Dmitriy Martyshkin, Vladimir Fedorov, Sergey Mirov

Proceedings Volume 10511, 105111R (2018) https://doi.org/10.1117/12.2290957

KEYWORDS: Diffusion, Crystals, Iron, Zinc, Laser crystals, Mid-IR, Absorption, Polishing, Solids, Ions

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Middle-infrared (mid-IR) lasers enabling a wide range of scientific, medical, technological, and defense related applications continue to enjoy a strong demand. Transition metal (TM) doped II-VI chalcogenides are appealing mid-IR gain medial providing direct access to 1.8-6 μm spectral range. . II-VI chalcogenides are available in single crystal and in polycrystalline forms. With respect to single crystals, polycrystalline gain elements fabricated by postgrowth thermal diffusion of TM impurities in II-VI hosts feature better optical quality and enable superior laser characteristics. Despite significant progress in post-growth thermal diffusion technology, there are still some difficulties associated with the diffusion of certain TM ions in certain II-VI hosts. Specifically, the diffusion length Fe in ZnS during ~1 month annealing at 950°C is of the order of 0.1 mm. In this work, enhancement of diffusion coefficient under Hot Isostatic Pressing, at temperature and pressure of 1350°C and 2000 atm, and effect of these extreme conditions on the overall optical quality of the crystal were studied. The high temperature was applied to increase the diffusion rate, and the high pressure was needed to suppress strong sublimation and sphalerite - wurtzite phase transition at elevated temperatures. Under these conditions, the diffusion coefficient Fe in ZnS was enhanced by 5500 times as compared to standard diffusion processes carried out at 950°C. It was also demonstrated that the grain size had grown from ~30μm to ~5.5mm, which is believed to be another reason for efficient diffusion besides the elevation of temperature. The XRD patterns were measured such that the X-ray beam falls on a single grain. The XRD patterns showed only peaks characteristic to single crystals with zinc blende structure. Lasing characterization was performed to investigate the optical quality of the crystal. Slope efficiencies of 23.2% and 15.4% were obtained for TM₁₁ and TM₀₀ modes of operation, respectively. The emission of the laser was demonstrated to be in the 3840-3920 nm.

Proceedings Article | 17 February 2017 Paper

Temperature dependence of spectroscopic and electrical properties of Cr(Fe):ZnSe laser active materials

Ozarfar Gafarov, Rick Watkins, Chandler Bernard, Vladimir Fedorov, Sergey Mirov

Proceedings Volume 10082, 1008226 (2017) https://doi.org/10.1117/12.2252670

KEYWORDS: Absorption, Temperature metrology, Bistability, Chromium, Iron, Crystals, Spectroscopy, Solid state lasers, Transition metals, Laser spectroscopy, Aluminum, Mid-IR, Annealing, Spectrophotometry, Diffusion

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Proceedings Article | 17 February 2017 Presentation + Paper

Enhancement of Fe diffusion in ZnSe/S laser crystals under hot isostatic pressing

Ozarfar Gafarov, Alan Martinez, Vladimir Fedorov, Sergey Mirov

Proceedings Volume 10082, 1008213 (2017) https://doi.org/10.1117/12.2252337

KEYWORDS: Diffusion, Mid-IR, Absorption, Iron, Transition metals, Molecules, Laser crystals, Solid state lasers, Laser spectroscopy, Spectroscopy, Zinc, Crystals, Absorbance, Ions, Annealing

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Proceedings Article | 24 February 2016 Paper

Mid-IR gain media based on transition metal-doped II-VI chalcogenides

S. Mirov, V. Fedorov, D. Martyshkin, I. Moskalev, M. Mirov, O. Gafarov, A. Martinez, J. Peppers, V. Smolski, S. Vasilyev, V. Gapontsev

Proceedings Volume 9744, 97440A (2016) https://doi.org/10.1117/12.2212822

KEYWORDS: Iron, Diffusion, Crystals, Mid-IR, Chalcogenides, Chromium, Ions, Semiconductor lasers, Transition metals, Annealing, Absorption, Zinc, Er:YAG lasers, Laser crystals

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Proceedings Article | 20 February 2015 Paper

Radiation-enhanced thermal diffusion of transition metal and rare earth ions into II-VI semiconductors

Alán Martinez, Lamario Williams, Ozarfar Gafarov, Dmitry Martyshkin, Vladimir Fedorov, Sergey Mirov

Proceedings Volume 9342, 93420G (2015) https://doi.org/10.1117/12.2080409

KEYWORDS: Diffusion, Crystals, Iron, Ions, Metals, Transition metals, Annealing, Absorption, Praseodymium, Zinc

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Showing 5 of 7 publications

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