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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.

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.

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.

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