Dr. Oleg Ryabushkin

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Academic Career Length

24Years (2003-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 June 2007

Conference Paper

Core temperature measurement of an active optical fiber in lasing regime

V. V. Gainov

D. T. Demyankov

Oleg Ryabushkin

The output power of a single-mode ytterbium fiber laser radiation (emission wavelength 1.06 mum) achieved 3 kW for the input pump power of about 5 kW at pump wavelength 0.96 mum. The power defect of about 2 kW between pump and laser radiation caused heating of the core of an active fiber. In this case the temperature of active medium increased by hundreds of degrees. Strongly-inhomogeneous heating of the optical fiber modifies not only profile of refractive index, but also spectroscopy properties of active medium, such as absorption and emission cross-sections of Yb³⁺ ions, pump conversion efficiency, emission wavelength etc. To the best of our knowledge no experiments for core temperature measurement in the active optical fiber in lasing regime have been reported up to date.

1 March 2022 in Quantum Electronics

Journal Article

Measurements of small optical absorption and scattering coefficients of high-power polarised laser radiation in lithium triborate crystals

A.K. Vorob’eV

We present the results of measurements of low optical absorption and scattering coefficients in lithium triborate crystals using the method of piezoelectric resonance laser calorimetry under the action of polarised single-mode laser radiation at wavelengths of 1070 and 532 nm in the power ranges of 50 – 300 and 5 – 50 W, respectively. It is shown that when radiation propagates along the crystal axis a, these coefficients remain constant in the specified power ranges and do not depend on the direction of laser radiation polarisation. The measured optical scattering coefficients are compared with the results obtained by the method of integrating spheres.

7 September 2024 in Crystals

Journal Article

Crystal Growth of LiNa₅Mo₉O₃₀ Crystals of High Optical Quality

Ekaterina Sergeevna Barkanova

Oleg Ryabushkin

The bulk of the LiNa₅Mo₉O₃₀ (LNM) crystals were successfully grown in the [010] and [001] directions without internal inclusions and cracks, using the Czochralski method with a low temperature gradient. The crystal grown in the [010] direction showed a tendency to twinning. The crystal grown in the [001] direction demonstrated high structural perfection (FWHM = 13″) for the (001) plane and high optical quality Δn ≈ 2 × 10⁻⁵. The laser-induced damage threshold was measured along a, b and c axes and was 12.2, 27.0 and 27.5 J/cm², respectively. The thermo-optical coefficient dn/dT was measured for the main crystallographic axes, which was −5.75 × 10⁻⁶, −20.2 × 10⁻⁶ and 3.65 × 10⁻⁶ K⁻¹ along the a, b and c axes, respectively. The second harmonic generation (SHG) was conducted in the crystalline LNM sample. The maximum efficiency value of 3.5% at a pump power of 12 W was achieved.

27 January 2003 in physica status solidi (c)

Journal Article

Acceptor states detection by microwave and current modulation spectroscopy

M. A. Chernikov

Oleg Ryabushkin

19 August 2024 in Preprints.org

Preprint

Crystal Growth of LiNa5Mo9O30 Crystals of High Optical Quality

Ekaterina Sergeevna Barkanova

Oleg Ryabushkin

The bulk LiNa5Mo9O30 (LNM) crystals were successfully grown in the [010] and [001] directions without internal inclusions and cracks by the Czochralskii method with low temperature gradient. The crystal grown in the [010] direction showed a tendency to twinning. The crystal grown in the [001] direction demonstrated high structural perfection (FWHM=13'') for the (001) plane and high optical quality Δn≈210-5. The laser induced damage threshold was measured along a, b and c axes and was 15.7, 27.0 and 27.5 J/cm2 respectively. The thermo-optical coefficient dn/dT was measured for the main crystallographic axes, which was -5.7510-6, -2.0210-5 and 3.6510-6 K-1 along the a, b and c axes, respectively. The second harmonic generation (SHG) is conducted in crystalline LNM sample. The maximum efficiency value of 3.5% at pump power of 12 W had been achieved.

About Me

Oleg Ryabushkin is Head of the Quantum Radio Physics Department, Kotelnikov Institute of Radio Engineering and Electronics of RAS, Fryazino, Moscow region, Russia. He received a Graduate degree from the Moscow Institute of Physics and Technology in 1973 and received a Ph.D. degree in quantum radiophysics from the Institute of Radio Engineering and Electronics of the Russian Academy of Sciences, Moscow, Russia, in 1980. His research interests included optical and optoelectronic bistabilities in semiconductors in conditions of low-temperature avalanche breakdown, the investigation of low-dimensional semiconductor structures by means of modulation spectroscopy, and also the development of various techniques for diagnostics of interaction of nonlinear crystals with high-power laser radiation using piezoelectric resonant spectroscopy. His recent work is primarily focused on the experimental analysis of active rare earth-doped fiber heating in the case of high-power laser generation and the development of methods for its effective cooling for application in industrial fiber lasers.

Dr. Oleg Ryabushkin

Dr. Oleg Ryabushkin

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