Fryazino, Russia
Fryazino, Russia

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Alekseev A.E.,NTO IRE - Polus | Tezadov Y.A.,NTO IRE - Polus | Potapov V.T.,NTO IRE - Polus
Technical Physics Letters | Year: 2012

We have studied the statistics of the intensity of backscattered radiation of a semiconductor laser in single-mode optic fiber as a function of the probing laser pulse duration and coherence time. It is shown that, at a given radiation source coherence time, the intensity distribution function varies, depending on the pulse duration, from nearly exponential to nearly Gaussian. The exponential statistics provides a better sensitivity for a coherent reflectometer with direct detection. Using the calculated distribution function, it is possible to qualitatively determine the degree of deterioration of the reflectometer sensitivity with respect to external factors during increasing probing pulse duration or decreasing laser coherence time. These data provide criteria for the optimum choice of a radiation source for the coherent fiber-optic reflectometer. © 2012 Pleiades Publishing, Ltd.

Zaitsev A.,NTO IRE - Polus
Acta Astronautica | Year: 2012

Using the proposed classification criteria, all known interstellar radio messages are divided into two essentially different groups - scientifically based messages and pseudo-messages. Imitation of interstellar transmissions by most of the exo-civilizations can cause the Great Silence. © 2011 Elsevier Ltd. All rights reserved.

Larin S.,NTO IRE - Polus | Antipov O.,RAS Institute of Applied Physics | Sypin V.,Moscow Institute of Physics and Technology | Vershinin O.,Moscow Institute of Physics and Technology
Optics Letters | Year: 2014

A novel concept of a booster amplifier for a pulsed Tm fiber laser at 1940 nm based on Tm:Lu2O3 ceramics and implementing fiber-combined signal and pump was examined. The pumping emission of the ceramics at 1678 nm was obtained from Raman-shifted Er fiber laser radiation. The hybrid fiber-ceramics amplifier with a gain factor of up to 6 dB and a pulse energy of more than 650 μJ with single-mode output was demonstrated. © 2014 Optical Society of America.

Kuznetsov M.,RAS Institute of Applied Physics | Vershinin O.,Moscow Institute of Physics and Technology | Tyrtyshnyy V.,NTO IRE - Polus | Antipov O.,RAS Institute of Applied Physics
Optics Express | Year: 2014

Spatio-temporal instability of the fundamental mode in Yb3+-doped few-mode PM fiber amplifiers with a core diameter of 8.5 μm was registered at 2-30 Watts pump power. Both experimental and theoretical analysis revealed the nonlinear power transformation of the LP01 fundamental mode into high-order modes. Numerical simulation revealed self-consistent growth of the higher-order mode and traveling electronic index grating accompanying the population grating induced by the mode interference field (due to different polarizability of the excited and unexcited Yb3+ ions). Experimental results and numerical calculations showed the increase of the instability threshold along with an increase of the signal frequency bandwidth. © 2014 Optical Society of America.

Gapontsev V.P.,NTO IRE - Polus | Tyrtyshnyy V.A.,NTO IRE - Polus | Vershinin O.I.,Moscow Institute of Physics and Technology | Davydov B.L.,NTO IRE - Polus | Oulianov D.A.,NTO IRE - Polus
Optics Express | Year: 2013

We present a method of third harmonic generation at 355 nm by frequency mixing of fundamental and second harmonic radiation of an ytterbium nanosecond pulsed all-fiber laser in a type-I phase-matched LiB3O5 (LBO) crystal where originally orthogonal polarization planes of the fundamental and second harmonic beams are aligned by an optically active quartz crystal. 8 W of ultraviolet light at 355 nm were achieved with 40% conversion efficiency from 1064 nm radiation. The conversion efficiency obtained in a type-I phase-matched LBO THG crystal was 1.6 times higher than the one achieved in a type-II LBO crystal at similar experimental conditions. In comparison to half-wave plates traditionally used for polarization alignment the optically active quartz crystal has much lower temperature dependence and requires simpler optical alignment. © 2013 Optical Society of America.

Antipov O.,RAS Institute of Applied Physics | Novikov A.,RAS Institute of Applied Physics | Larin S.,NTO IRE - Polus | Obronov I.,Moscow Institute of Physics and Technology
Optics Letters | Year: 2016

Highly efficient laser oscillations at 2 μm were investigated in Tm:Lu2O3 ceramics in-band pumped at 1670 nm by a Raman-shifted erbium fiber laser. Both 23 W CW and 5 W active Q-switched oscillations with 40 ns pulse duration and 15-30 kHz repetition rate were achieved in a high-quality beam. The evolution of two generated waves at 1966 and 2064 nm in dependence on pump power was studied. © 2016 Optical Society of America.

Chapman B.H.,Imperial College London | Doronkin A.V.,NTO IRE - Polus | Popov S.V.,Imperial College London | Taylor J.R.,Imperial College London
Optics Letters | Year: 2012

We report the development of a 10 GHz repetition rate all-fiber integrated femtosecond source tunable around 1.55 μm. A phase modulator and sharp spectral filter are used to convert the output of a tunable CW diode to a 10 GHz pulse train. These pulses are compressed using Raman soliton adiabatic compression in a 21 km long length of fiber to generate sub-300-fs duration pulses at a 10 GHz repetition rate. By tuning the wavelength of the diode and appropriate filtering, similar performance was achieved over a 20 nm bandwidth. © 2012 Optical Society of America.

Alekseev A.E.,NTO IRE - Polus | Tezadov Y.A.,NTO IRE - Polus | Potapov V.T.,NTO IRE - Polus
Technical Physics Letters | Year: 2013

The results of a study of a scattered-light interferometer for detecting external acoustic impacts on optical fiber are presented. A method of scattered field demodulation using the phase diversity technique is proposed. The demodulated signal is shown to contain regions of fading, the causes of which are analyzed. © 2013 Pleiades Publishing, Ltd.

Chapman B.H.,Imperial College London | Doronkin A.V.,NTO IRE - Polus | Stone J.M.,University of Bath | Knight J.C.,University of Bath | And 2 more authors.
Optics Express | Year: 2013

We present a laser system capable of producing 190 femtosecond pulses at a repetition rate of 20 GHz. The spectral masking of a phase modulated diode laser is used to produce a train of picosecond pulses which are compressed using a fibre-grating compressor followed by subsequent adiabatic soliton compression to the femtosecond regime using a tapered photonic crystal fiber. © 2013 Optical Society of America.

Doronkin A.V.,NTO IRE - Polus
Proceedings - 2014 International Conference Laser Optics, LO 2014 | Year: 2014

Pulsed supercontinuum fiber source with more than 10 W average output power have been demonstrated. Output spectrum has short wavelength edge less than 400 nm and long wavelength edge more than 2200 nm. Spectral power density in the visible spectral region is 3-10 dBm/nm. Short-term pulse energy stability in 1 nm visible spectral band is ± 3% RMS. To the best of our knowledge supercontinuum fiber source under discussion have the optimal combination of output characteristics in the industry. © 2014 IEEE.

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