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Your search keyword '"Sokolovskii, A S"' showing total 24 results
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24 results on '"Sokolovskii, A S"'

1. Diode-pumped Yb:CALGO laser with conical refraction output

Author

Reza, Md A.R., Akbari, R., Fedorova, K. A., Sokolovskii, G. S., Rafailov, E. U., Major, A., Clarkson, W. Andrew, and Shori, Ramesh K.

Subjects
Physics::Optics, Physics::Atomic Physics
Abstract

A high power conical refraction (CR) laser was demonstrated based on Yb:CALGO laser crystal with a separate intracavity CR element. The CR laser delivered the maximum output power of 6.25 W at 25 W of incident pump power which is the highest output power for the CR lasers to date. The separation of the CR element from the laser gain medium reduced the complexity of laser pumping. The generated CR laser beam exhibited excellent quality with well-resolved concentric rings and the Poggendorff dark ring.

Published
2020

3. Diode-pumped Yb:CALGO laser with conical refraction output

Author

Clarkson, W. Andrew, Shori, Ramesh K., Reza, Md A.R., Akbari, R., Fedorova, K. A., Sokolovskii, G. S., Rafailov, E. U., Major, A., Clarkson, W. Andrew, Shori, Ramesh K., Reza, Md A.R., Akbari, R., Fedorova, K. A., Sokolovskii, G. S., Rafailov, E. U., and Major, A.

Abstract

A high power conical refraction (CR) laser was demonstrated based on Yb:CALGO laser crystal with a separate intracavity CR element. The CR laser delivered the maximum output power of 6.25 W at 25 W of incident pump power which is the highest output power for the CR lasers to date. The separation of the CR element from the laser gain medium reduced the complexity of laser pumping. The generated CR laser beam exhibited excellent quality with well-resolved concentric rings and the Poggendorff dark ring.

Published
2020

4. Conical refraction of a high-M2 laser beam

Author

Sokolovskii, Grigorii S., Mylnikov, V.Yu, Losev, Sergey N., Fedorova, Ksenia A., Rafailov, Edik U., Kudryashov, Alexis V., Paxton, Alan H., and Ilchenko, Vladimir S.

Subjects
Physics::Accelerator Physics
Abstract

We report on experiments with conical refraction of laser beams possessing a high beam propagation parameter M2. With beam propagation parameter values M2=3 and M2=5, unusual Lloyd's distributions with correspondingly three and five dark rings were observed. In order to explain this phenomenon, we extend the dual-cone model of the conical refraction that describes it as a product of interference of two cones that converge and diverge behind the exit facet of the crystal. In the extended model, these converging/diverging cones are represented as the cone-shaped quasi-Gaussian beams possessing the M2 parameter of an original beam. In this formalism, a beam-waist of these cone-shaped beams is proportional to the M2 value and defines the area of their interference which is a width of the Lloyd's ring. Therefore, the number of dark rings in the Lloyd distribution is defined by the M2 value and can be much greater than unity. The results of the numerical simulations within the extended dual-cone model are in excellent agreement with the experiment.

Published
2017

6. Conical refraction of a high-M2 laser beam

Author

Kudryashov, Alexis V., Paxton, Alan H., Ilchenko, Vladimir S., Sokolovskii, Grigorii S., Mylnikov, V.Yu, Losev, Sergey N., Fedorova, Ksenia A., Rafailov, Edik U., Kudryashov, Alexis V., Paxton, Alan H., Ilchenko, Vladimir S., Sokolovskii, Grigorii S., Mylnikov, V.Yu, Losev, Sergey N., Fedorova, Ksenia A., and Rafailov, Edik U.

Abstract

We report on experiments with conical refraction of laser beams possessing a high beam propagation parameter M2. With beam propagation parameter values M2=3 and M2=5, unusual Lloyd's distributions with correspondingly three and five dark rings were observed. In order to explain this phenomenon, we extend the dual-cone model of the conical refraction that describes it as a product of interference of two cones that converge and diverge behind the exit facet of the crystal. In the extended model, these converging/diverging cones are represented as the cone-shaped quasi-Gaussian beams possessing the M2 parameter of an original beam. In this formalism, a beam-waist of these cone-shaped beams is proportional to the M2 value and defines the area of their interference which is a width of the Lloyd's ring. Therefore, the number of dark rings in the Lloyd distribution is defined by the M2 value and can be much greater than unity. The results of the numerical simulations within the extended dual-cone model are in excellent agreement with the experiment.

Published
2017

7. AlGaInP red-emitting light emitting diode under extremely high pulsed pumping

Author

Jeon, Heonsu, Tu, Li-Wei, Krames, Michael R., Strassburg, Martin, Yadav, Amit, Titkov, Ilya, Sokolovskii, Grigorii S., Karpov, Sergey Yu, Dudelev, Vladislav V., Soboleva, Ksenya K., Pietzonka, Ines, Lugauer, Hans-Juergen, Rafailov, Edik U., Jeon, Heonsu, Tu, Li-Wei, Krames, Michael R., Strassburg, Martin, Yadav, Amit, Titkov, Ilya, Sokolovskii, Grigorii S., Karpov, Sergey Yu, Dudelev, Vladislav V., Soboleva, Ksenya K., Pietzonka, Ines, Lugauer, Hans-Juergen, and Rafailov, Edik U.

Abstract

Efficiency of commercial 620 nm InAlGaP Golden Dragon-cased high-power LEDs has been studied under extremely high pump current density up to 4.5 kA/cm2 and pulse duration from microsecond down to sub-nanosecond range. No efficiency decrease and negligible red shift of the emission wavelength is observed in the whole range of drive currents at nanosecond-range pulses with duty cycles well below 1%. Analysis of the pulse-duration dependence of the LED efficiency and emission spectrum suggests the active region overheating to be the major mechanism of the LED efficiency reduction at higher pumping, dominating over the electron overflow and Auger recombination.

Published
2016

9. Impact of the carrier relaxation paths on two-state operation in quantum dot lasers

Author

Sokolovskii, G. S., additional, Dudelev, V. V., additional, Kolykhalova, E. D., additional, Soboleva, K. K., additional, Deryagin, A. G., additional, Novikov, I. I., additional, Maximov, M. V., additional, Zhukov, A. E., additional, Ustinov, V. M., additional, Kuchinskii, V. I., additional, Sibbett, W., additional, Rafailov, E. U., additional, Viktorov, E. A., additional, and Erneux, T., additional

Published
2015
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10. Optical trapping with superfocused high-M2laser diode beam

Author

Sokolovskii, G. S., additional, Dudelev, V. V., additional, Melissinaki, V., additional, Losev, S. N., additional, Soboleva, K. K., additional, Deryagin, A. G., additional, Kuchinskii, V. I., additional, Farsari, M., additional, Sibbett, W., additional, and Rafailov, E. U., additional

Published
2015
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11. Efficient generation of orange light by frequency-doubling of a quantum-dot laser radiation in a PPKTP waveguide

Author

Vodopyanov, Konstantin L., Fedorova, Ksenia A., Sokolovskii, Grigorii S., Battle, Philip R., Livshits, Daniil A., Rafailov, Edik U., Vodopyanov, Konstantin L., Fedorova, Ksenia A., Sokolovskii, Grigorii S., Battle, Philip R., Livshits, Daniil A., and Rafailov, Edik U.

Abstract

Orange light with maximum conversion efficiency exceeding 10% and CW output power of 12.04 mW, 10.45 mW and 6.24 mW has been generated at 606, 608, and 611 nm, respectively, from a frequency-doubled InAs/GaAs quantum-dot external-cavity diode laser by use of a periodically-poled KTP waveguides with different cross-sectional areas. The wider waveguide with the cross-sectional area of 4×4 μm demonstrated better results in comparison with the narrower waveguides (3×5 μm and 2×6 μm) which corresponded to lower coupling efficiency. Additional tuning of second harmonic light (between 606 and 614 nm) with similar conversion efficiency was possible by changing the crystal temperature.

Published
2014

12. Superfocusing of high-M2semiconductor laser beams: experimental demonstration

Author

Sokolovskii, G. S., additional, Melissinaki, V., additional, Dudelev, V. V., additional, Losev, S. N., additional, Soboleva, K. K., additional, Kolykhalova, E. D., additional, Deryagin, A. G., additional, Kuchinskii, V. I., additional, Viktorov, E. A., additional, Farsari, M., additional, Sibbett, W., additional, and Rafailov, E. U., additional

Published
2014
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13. The effect of slow passage in the pulse-pumped quantum dot laser

Author

Sokolovskii, G. S., additional, Abu Saa, M., additional, Danckaert, J., additional, Dudelev, V. V., additional, Deryagin, A. G., additional, Novikov, I. I., additional, Maximov, M. V., additional, Zhukov, A. E., additional, Ustinov, V. M., additional, Kuchinskii, V. I., additional, Sibbett, W., additional, Rafailov, E. U., additional, Viktorov, E. A., additional, and Erneux, T., additional

Published
2014
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16. Generation of tunable visible picosecond pulses by frequency-doubling of a quantum-dot laser in a PPKTP waveguide

Author

Vodopyanov, Konstantin L., Fedorova, Ksenia A., Sokolovskii, Grigorii S., Nikitichev, Daniil I., Battle, Philip R., Livshits, Daniil A., Rafailov, Edik U., Vodopyanov, Konstantin L., Fedorova, Ksenia A., Sokolovskii, Grigorii S., Nikitichev, Daniil I., Battle, Philip R., Livshits, Daniil A., and Rafailov, Edik U.

Abstract

We demonstrate a compact all-room-temperature picosecond laser source broadly tunable in the visible spectral region between 600 nm and 627 nm. The tunable radiation is obtained by frequency-doubling of a tunable quantum-dot external-cavity mode-locked laser in a periodically-poled KTP multimode waveguide. In this case, utilization of a significant difference in the effective refractive indices of the high- and low-order modes enables to match the period of poling in a very broad wavelength range. The maximum achieved second harmonic output peak power is 3.25 mW at 613 nm for 71.43 mW of launched pump peak power at 1226 nm, resulting in conversion efficiency of 4.55%.

Published
2013

20. High power Bessel beams from EP-VECSELs

Author

Sokolovskii, G. S., primary, Zolotovskaya, S. A., additional, Losev, S. N., additional, Dudelev, V. V., additional, Deryagin, A. G., additional, Kuchinskii, V. I., additional, Sibbett, W., additional, and Rafailov, E. U., additional

Published
2011
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