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227 results on '"Veselov D"'

1. Observation of long turn-on delay in pulsed quantum cascade lasers

Author

Cherotchenko, E. D., Dudelev, V. V., Mikhailov, D. A., Losev, S. N., Babichev, A. V., Gladyshev, A. G., Novikov, I. I., Lutetskiy, A. V., Veselov, D. A., Slipchenko, S. O., Pikhtin, N. A., Karachinsky, L. Ya., Denisov, D. V., Kuchinskii, V. I., Kognovitskaya, E. A., Egorov, A. Yu., Teissier, R., Baranov, A. N., and Sokolovskii, G. S.

Subjects
Physics - Optics, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We present an experimental study of the turn-on delay in pulsed mid-infrared quantum cascade lasers. We report the unexpectedly long delay time depending on the pumping current, which does not agree with conventional theoretical predictions for step-like excitation. Similar behavior has been observed in InP- and InAs-based QCLs emitting near 8${\mu}$m. Numerical simulations performed using a model based on rate equations for excitation by current pulses with non-zero rise time provide fair agreement with our observations.

Published
2021
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17. Measurements of internal optical loss inside an operating laser diode.

Author

Veselov, D. A., Bobretsova, Yu. K., Leshko, A. Y., Shamakhov, V. V., Slipchenko, S. O., and Pikhtin, N. A.

Subjects
*OPTICAL measurements, *OPTICAL losses, *WAVEGUIDE lasers, *BUSINESS losses, *QUANTUM efficiency, *SEMICONDUCTOR lasers
Abstract

An experimental technique for measuring internal optical loss in high-power edge-emitting semiconductor lasers is demonstrated. The technique is based on coupling a probe beam into the waveguide of a pulse-pumped laser diode. It allows measuring free-carrier absorption (FCA) in a laser heterostructure at different temperatures and at pump current levels up to 30 kA/cm2. Measurement results are presented for two laser heterostructure designs, which vary in the waveguide doping level and material. For both heterostructures, the pump current increase induces a significant rise in FCA and a corresponding increase in internal optical loss, from 0.4–0.7 cm−1 at the threshold current to 2–2.5 cm−1 at 15 kA/cm2. At higher temperatures, the dependence is even stronger and the internal optical loss rises to 6 cm−1 (65 °C, 27 kA/cm2). The gradient of the FCA current dependence is lower for the laser heterostructure with a doped GaAs waveguide, while the heterostructure with an undoped AlGaAs waveguide displays a larger increase in FCA but better internal quantum efficiency at high currents. These results show that the proposed experimental method has significant potential. [ABSTRACT FROM AUTHOR]

Published
2019
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18. Observation of Long Turn-On Delay in Pulsed Quantum Cascade Lasers

Author

Cherotchenko, E. D., primary, Dudelev, V. V., additional, Mikhailov, D. A., additional, Losev, S. N., additional, Babichev, A. V., additional, Gladyshev, A. G., additional, Novikov, I. I., additional, Lutetskiy, A. V., additional, Veselov, D. A., additional, Slipchenko, S. O., additional, Pikhtin, N. A., additional, Karachinsky, L. Ya., additional, Denisov, D. V., additional, Kuchinskii, V. I., additional, Kognovitskaya, E. A., additional, Egorov, A. Yu., additional, Teissier, R., additional, Baranov, A. N., additional, and Sokolovskii, G. S., additional

Published
2022
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26. On the control efficiency of a high-power laser thyristor emitting in the 890–910 nm spectral range

Author

Slipchenko, S. O., Podoskin, A. A., Vasil’eva, V. V., Pikhtin, N. A., Rozhkov, A. V., Gorbatyuk, A. V., Zolotarev, V. V., Veselov, D. A., Jabotinskii, A. V., Petukhov, A. A., Tarasov, I. S., Bagaev, T. A., Zverkov, M. V., Konyaev, V. P., Kurniavko, Y. V., Ladugin, M. A., Lobintsov, A. V., Marmalyuk, A. A., Padalitsa, A. A., and Simakov, V. A.

Published
2014
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33. “Astrometry” experiment to measure the temporal variations in the shape and diameter of the sun on the service module of the Russian segment of the international space station

Author

Abdussamatov, Kh. I., Alekseev, Yu. V., Antoshkov, A. A., Arkhipova, L. N., Budin, V. P., Veselov, D. P., Garbul’, A. A., Ivanov, A. I., Izmailov, I. S., Karinskii, V. A., Konoshenko, V. P., Kuznetsov, A. A., Markov, A. V., Martynov, S. N., Mel’nikov, V. E., Mirzoeva, L. A., Nikolaev, I. I., Oleinikov, L. Sh., Sivyakov, I. N., and Khankov, S. I.

Published
2007
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37. Observation of the Turn-on Delay in InAs- and InP-based Quantum Cascade Lasers under Pulsed Pumping with Non-zero Rise-time

Author

Cherotchenko, E. D., primary, Dudelev, V. V., additional, Mikhailov, D. A., additional, Losev, S. N., additional, Babichev, A. V., additional, Gladyshev, A. G., additional, Novikov, I. I., additional, Lutetskiy, A. V., additional, Veselov, D. A., additional, Slipchenko, S. O., additional, Pikhtin, N. A., additional, Karachinsky, L. Ya., additional, Denisov, D. V., additional, Kuchinskii, V. I., additional, Kognovitskaya, E. A., additional, Egorov, A. Yu., additional, Teissier, R., additional, Baranov, A. N., additional, and Sokolovskii, G. S., additional

Published
2021
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38. Two-state operation of high-power semiconductor lasers with a thick quantum well.

Author

Veselov, D. A., Ayusheva, K. R., Pikhtin, N. A., Lyutetskiy, A. V., Slipchenko, S. O., and Tarasov, I. S.

Subjects
*SEMICONDUCTOR lasers, *QUANTUM wells, *QUANTUM states, *GALLIUM arsenide, *INDIUM gallium arsenide
Abstract

We have examined the two-state operation process of the high-power edge-emitting lasers based on AlGaAs/InGaAs/GaAs heterostructure with a thick (90Å) quantum well in the active region. It has been demonstrated that the laser emission spectrum can be switched between spectral lines corresponding to different optical transitions between the quantum states in the active region. The switching process is governed either by pump current or by temperature. The dynamic characteristics of the switching laser pumped with 100 ns current pulses have been investigated and explained. It has been shown that the current density dependence of internal optical loss can cause the currentinitiated switching. The temperature impact is much more important and consists in the charge carrier redistribution in the quantum well. The registered optical power near the switching point was near 2W in continuous wave and 15W in pulse mode of operation. [ABSTRACT FROM AUTHOR]

Published
2017
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46. Observation of the increase in turn-on delay of quantum cascade lasers under pulsed electrical pumping with finite rise time

Author

Cherotchenko, E D, primary, Dudelev, V V, additional, Mikhailov, D A, additional, Losev, S N, additional, Babichev, A V, additional, Gladyshev, A G, additional, Novikov, I I, additional, Lutetskiy, A V, additional, Veselov, D A, additional, Slipchenko, S O, additional, Pikhtin, N A, additional, Karachinsky, L Ya, additional, Denisov, D V, additional, Kuchinskii, V I, additional, Kognovitskaya, E A, additional, Egorov, A Yu, additional, Teissier, R, additional, Baranov, A N, additional, and Sokolovskii, G S, additional

Published
2020
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