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Imenkov A.N.,RAS Ioffe Physical - Technical Institute | Grebenshchikova E.A.,RAS Ioffe Physical - Technical Institute | Shutaev V.A.,Saint Petersburg State Polytechnic University | Ospennikov A.M.,Russian Institute of Radionavigation and Time | And 2 more authors.
Semiconductors | Year: 2016

Pd–oxide–InP (MOS) structures are fabricated, and their physical and photoelectric properties in a hydrogen atmosphere are investigated. It is established that a decrease in photovoltage of the structure and a large increase in photocurrent in the circuit are observed under the pulsed effect of hydrogen on the structure with a palladium layer illuminated by a light-emitting diode (LED of the wavelength λ = 0.9 μm). The kinetics and mechanism of the variation in the photovoltage and photocurrent are considered. It is assumed that the photovoltage decreases because of the ionization of hydrogen atoms in the Pd layer, and the photocurrent increases due to the thermionic emission of nonequilibrium electrons from the Pd layer into the semiconductor. On the basis of results of the investigations, the sensitive element for an optoelectronic hydrogen sensor is developed. © 2016, Pleiades Publishing, Ltd. Source


Zholnerov V.S.,Russian Institute of Radionavigation and Time | Vershovskiy A.K.,RAS Ioffe Physical - Technical Institute | Rozhdestvenskiy Yu.V.,Saint Petersburg State University of Information Technologies, Mechanics and Optics
EFTF 2012 - 2012 European Frequency and Time Forum, Proceedings | Year: 2012

A scheme of a satellite slow-beam microwave atomic clock is presented. A modified Zeeman slower is used for longitudinal cooling of the atomic beam, and a combined CPT-Ramsey registration technique with space domain separation is used for the signal registration. © 2012 IEEE. Source


Zholnerov V.S.,Russian Institute of Radionavigation and Time | Ivanov A.V.,Ojsc Mf Stelmakh Polyus Research Institute | Kurnosov V.D.,Ojsc Mf Stelmakh Polyus Research Institute | Kurnosov K.V.,Ojsc Mf Stelmakh Polyus Research Institute | And 2 more authors.
Quantum Electronics | Year: 2013

We have studied the amplitude noise in a fibre Bragg grating laser diode. It has been shown that discontinuities in noise characteristics correlate with those in the power -current and spectral characteristics of the laser diode, whereas the noise characteristics of the pump source have no such discontinuities. The highest noise level has been observed at pump currents corresponding to concurrent generation of two longitudinal modes. © 2013 Kvantovaya Elektronika and Turpion Ltd. Source


Zholnerov V.S.,Russian Institute of Radionavigation and Time | Ivanov A.V.,Stelmakh Research and Development Institute Polyus | Kurnosov V.D.,Stelmakh Research and Development Institute Polyus | Kurnosov K.V.,Stelmakh Research and Development Institute Polyus | And 2 more authors.
Technical Physics | Year: 2014

Theoretical and experimental results are used to demonstrate that an increase in the pump current leads to an increase in the range of continuous variation in the radiation wavelength and power of a laser diode with a fiber Bragg grating with a decrease in the fiber length. An expression for the gain that depends on the carrier density in the laser active area is derived. The watt-ampere and spectral characteristics that are calculated in the two cases are in reasonable agreement. © 2014 Pleiades Publishing, Ltd. Source


Zholnerov V.S.,Russian Institute of Radionavigation and Time | Vershovskii A.K.,RAS Ioffe Physical - Technical Institute | Rozhdestvenskiy Yu.V.,Saint Petersburg State University of Information Technologies, Mechanics and Optics
2013 Joint European Frequency and Time Forum and International Frequency Control Symposium, EFTF/IFC 2013 | Year: 2013

Numerical modeling of different compact slowing schemes designed for a satellite slow-beam microwave atomic clock is presented. © 2013 IEEE. Source

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