Dr. Vladimir Karpov Profile

Dr. Vladimir Karpov

Sales Representative at MPB Communications Inc

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Publications (11)

Proceedings Article | 5 March 2021 Open Access

MPB Communications Inc.: Higher Power Single Frequency Raman and & Visible Raman Fiber Amplifiers for Quantum Physics

Vladimir Karpov

Proceedings Volume 11716, 117161D (2021) https://doi.org/10.1117/12.2596011

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Proceedings Article | 7 March 2019 Presentation + Paper

High power single frequency, linearly polarized DFB Raman fiber laser operating at 1178 nm

Vladimir Karpov, Sebastien Loranger, Raman Kashyap

Proceedings Volume 10897, 108971O (2019) https://doi.org/10.1117/12.2508059

KEYWORDS: Fiber lasers, Fiber Bragg gratings, Raman spectroscopy, Laser scattering, Interferometers, Chemical elements, Phase modulation, Q switched lasers, Optical fibers, Chemical species

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Proceedings Article | 10 July 2018 Presentation + Paper

A 100-W 1178-nm continuous-wave single-frequency linearly polarized Raman fiber amplifier

D. Wei, V. Karpov, N. Guo, W. R. Clements

Proceedings Volume 10703, 107030S (2018) https://doi.org/10.1117/12.2312114

KEYWORDS: Radiofrequency ablation, Fiber lasers, Raman spectroscopy, Fiber amplifiers, Laser guide stars, Continuous wave operation, Stars, Wavelength division multiplexing, Optical components, Optical amplifiers

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Proceedings Article | 8 October 2015 Paper

Robust remote-pumping sodium laser for advanced LIDAR and guide star applications

Bernhard Ernstberger, Martin Enderlein, Axel Friedenauer, Robin Schwerdt, Daoping Wei, Vladimir Karpov, Patrick Leisching, Wallace Clements, Wilhelm Kaenders

Proceedings Volume 9641, 96410F (2015) https://doi.org/10.1117/12.2194874

KEYWORDS: Lasers, Laser systems engineering, Fiber lasers, Electronics, Laser guide stars, Second-harmonic generation, Stars, Sodium, Telescopes, Wavefronts

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The performance of large ground-based optical telescopes is limited due to wavefront distortions induced by atmospheric turbulence. Adaptive optics systems using natural guide stars with sufficient brightness provide a practical way for correcting the wavefront errors by means of deformable mirrors. Unfortunately, the sky coverage of bright stars is poor and therefore the concept of laser guide stars was invented, creating an artificial star by exciting resonance fluorescence from the mesospheric sodium layer about 90 km above the earth’s surface. Until now, mainly dye lasers or sumfrequency mixing of solid state lasers were used to generate laser guide stars. However, these kinds of lasers require a stationary laser clean room for operation and are extremely demanding in maintenance. Under a development contract with the European Southern Observatory (ESO) and W. M. Keck Observatory (WMKO), TOPTICA Photonics AG and its partner MPB Communications have finalized the development of a next-generation sodium guide star laser system which is available now as a commercial off-the-shelf product. The laser is based on a narrow-band diode laser, Raman fiber amplifier (RFA) technology and resonant second-harmonic generation (SHG), thus highly reliable and simple to operate and maintain. It emits > 22 W of narrow-linewidth (≈ 5 MHz) continuous-wave radiation at sodium resonance and includes a re-pumping scheme for boosting sodium return flux. Due to the SHG resonator acting as spatial mode filter and polarizer, the output is diffraction-limited with RMS wavefront error < λ/25. Apart from this unique optical design, a major effort has been dedicated to integrating all optical components into a ruggedized system, providing a maximum of convenience and reliability for telescope operators. The new remote-pumping architecture allows for a large spatial separation between the main part of the laser and the compact laser head. Together with a cooling-water flow of less than 5 l/min and an overall power consumption of < 700 W, the system offers a maximum of flexibility with minimal infrastructure demands on site. Each system is built in a modular way, based on the concept of line-replaceable units (LRU). A comprehensive system software, as well as an intuitive service GUI, allow for remote control and error tracking down to at least the LRU level. In case of a failure, any LRU can be easily replaced. With these fiber-based guide star lasers, TOPTICA for the first time offers a fully engineered, off-the-shelf guide star laser system for groundbased optical telescopes providing convenient, turn-key operation in remote and harsh locations. Reliability and flexibility will be beneficial in particular for advanced satellite and space debris tracking as well as LIDAR applications.

Proceedings Article | 21 July 2014 Paper

Series production of next-generation guide-star lasers at TOPTICA and MPBC

Martin Enderlein, Axel Friedenauer, Robin Schwerdt, Paul Rehme, Daoping Wei, Vladimir Karpov, Bernhard Ernstberger, Patrick Leisching, Wallace R. Clements, Wilhelm Kaenders

Proceedings Volume 9148, 914807 (2014) https://doi.org/10.1117/12.2055059

KEYWORDS: Fiber lasers, Control systems, Telescopes, Laser systems engineering, Semiconductor lasers, Electronics, Second-harmonic generation, Laser safety, Radiofrequency ablation, Lasers

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Proceedings Article | 13 September 2012 Paper

RFA-based 589-nm guide star lasers for ESO VLT: a paradigm shift in performance, operational simplicity, reliability, and maintenance

Axel Friedenauer, Vladimir Karpov, Daoping Wei, Manfred Hager, Bernhard Ernstberger, Wallace Clements, Wilhelm Kaenders

Proceedings Volume 8447, 84470F (2012) https://doi.org/10.1117/12.923869

KEYWORDS: Fiber lasers, Laser guide stars, Semiconductor lasers, Laser systems engineering, Telescopes, Stars, Laser development, Sodium, Fiber amplifiers, Lasers

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Large telescopes equipped with adaptive optics require 20-25W CW 589-nm sources with emission linewidths of ~5 MHz. These Guide Star (GS) lasers should also be highly reliable and simple to operate and maintain for many years at the top of a mountain facility. Under contract from ESO, industrial partners TOPTICA and MPBC are nearing completion of the development of GS lasers for the ESO VLT, with delivery of the first of four units scheduled for December 2012. We report on the design and performance of the fully-engineered Pre-Production Unit (PPU), including system reliability/availability analysis, the successfully-concluded qualification testing, long-term component and system level tests and long-term maintenance and support planning. The chosen approach is based on ESO's patented narrow-band Raman Fiber Amplifier (EFRA) technology. A master oscillator signal from a linearly-polarized TOPTICA 20-mW, 1178-nm CW diode laser, with stabilized emission frequency and controllable linewidth up to a few MHz, is amplified in an MPBC polarization-maintaining (PM) RFA pumped by a high-power 1120-nm PM fiber laser. With efficient stimulated Brillouin scattering suppression, an unprecedented 40W of narrow-band RFA output has been obtained. This is then mode-matched into a resonant-cavity doubler with a free-spectral-range matching the sodium D₂a to D₂b separation, allowing simultaneous generation of an additional frequency component (D₂b line) to re-pump the sodium atom electronic population. With this technique, the return flux can be increased without having to resort to electro-optical modulators and without the risk of introducing optical wave front distortions. The demonstrated output powers with doubling efficiencies >80% at 589 nm easily exceed the 20W design goal and require less than 700 W of electrical power. In summary, the fiber-based guide star lasers provide excellent beam quality and are modular, turn-key, maintenance-free, reliable, efficient, and ruggedized devices whose compactness allows installation directly onto the launch telescope structure.

Proceedings Article | 13 September 2012 Paper

The ESO transportable LGS Unit for measurements of the LGS photon return and other experiments

D. Bonaccini Calia, I. Guidolin, A. Friedenauer, M. Hager, V. Karpov, T. Pfrommer, R. Holzlöhner, S. Lewis, W. Hackenberg, G. Lombardi, M. Centrone, F. Pedichini

Proceedings Volume 8450, 84501R (2012) https://doi.org/10.1117/12.926898

KEYWORDS: Telescopes, Sodium, Continuous wave operation, Pulsed laser operation, Polarization, Laser guide stars, Adaptive optics, Wavefront sensors, Wavefronts, Receivers

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Proceedings Article | 28 July 2010 Paper

PM fiber lasers at 589nm: a 20W transportable laser system for LGS return flux studies

Domenico Bonaccini Calia, Axel Friedenauer, Vladimir Protopopov, I. Guidolin, Luke Taylor, Vladimir Karpov, Manfred Hager, Wallace R. Clements, Bernhard Ernstberger, Steffan Lewis, Wilhelm Kaenders

Proceedings Volume 7736, 77361U (2010) https://doi.org/10.1117/12.857991

KEYWORDS: Fiber lasers, Radiofrequency ablation, Laser stabilization, Telescopes, Laser guide stars, Polarization, Pulsed laser operation, Second-harmonic generation, Bragg cells, Lasers

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Proceedings Article | 13 July 2010 Paper

Diode-seeded fiber-based sodium laser guide stars ready for deployment

Wilhelm Kaenders, Axel Friedenauer, Vladimir Karpov, Vladimir Protopopov, Wallace R. Clements, Luke Taylor, Y. Feng, Domenico Bonaccini Calia, Bernhard Ernstberger

Proceedings Volume 7736, 773621 (2010) https://doi.org/10.1117/12.871383

KEYWORDS: Laser systems engineering, Fiber lasers, Laser guide stars, Telescopes, Fiber amplifiers, Sodium, Semiconductor lasers, Raman spectroscopy, Laser development, Lasers

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Proceedings Article | 17 May 2000 Paper

Temperature sensor based on fiber Bragg grating

V. Protopopov, V. Karpov, Oleg Medvedkov, Sergei Vasiliev, M. Grekov, Eugeni Dianov, S. Palto

Proceedings Volume 4083, (2000) https://doi.org/10.1117/12.385649

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Proceedings Article | 17 May 2000 Paper

Yb3+-doped double-clad fibers and lasers

Andrey Kurkov, A. Laptev, Eugeni Dianov, Alexei Guryanov, V. Karpov, Vladimir Paramonov, Oleg Medvedkov, A. Umnikov, V. Protopopov, Nikolai Vechkanov, Sergei Vasiliev, E. Pershina

Proceedings Volume 4083, (2000) https://doi.org/10.1117/12.385638

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