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Dr Vasili Savitski

Research Fellow

Institute of Photonics

Personal statement

I received the Engineer Diploma in Optics from the Belarus National Technical University, Minsk, in 1999, and the Ph.D. degree from the Institute of Physics, Minsk, in 2005 for work on nonlinear effects in semiconductor quantum dots in glasses. I worked at the International Laser Centre, Minsk on nonlinear spectroscopy in quantum dots, passive mode locking and Q-switching, thermal effects in lasers from 1999 to 2007. Since 2008 I am a Research Fellow at the Institute of Photonics, where I delivered scientific objectives on two EPSRC projects (EP/E06440X/1, EP/G00014X/1), and now managing two strands in the ERC project (#278389). I have expertise in designing and building breadboard lasers for proof of concept applications tests (EP/E06440X/1).

During my career in the Institute, I undertook the first systematic study of Raman gain in diamond as a function of the pump wavelength and demonstrated the first multi-watt CW diamond Raman laser in the IR, with substantial improvement of the Raman laser beam quality over that of the pump source (brightness enhancement). I also gained experience in synthesis and spectroscopic study of colour centres in diamonds (NV and H3) for applications as laser gain material and in optical magnetometry.

Research areas and expertise:

  • Solid-state lasers (VECSELs, crystalline, Raman) within spectral range of 0.6-2.5um:

Passive/active Q-switching

Passive mode-locking (picosecond, femtosecond)

Cavity dumping

Thermal management

Breadboard demonstrators

  •  Spectroscopy:

Femtosecond pump-probe for lifetime measurements

Absorption saturation

Optical gain

Luminescence decay kinetics

Quantum yield

  •  Synthesis of colour centres in diamonds:

HPHT treatment

Electron beam irradiation

  •  Modelling:

Passive Q-switching

Non-linear spectroscopic effects (absorption saturation, bleaching decay)

Publications

Sub-100 ps monolithic diamond Raman laser emitting at 573 nm
Nikkinen Jari, Savitski Vasili, Reilly Sean, Dziechciarczyk Łukasz, Härkönen Antti, Kemp Alan, Guina Mircea
IEEE Photonics Technology Letters, pp. 1-4, (2018)
http://dx.doi.org/10.1109/LPT.2018.2806183
Optical gain in NV- colour centres for highly-sensitive magnetometry : a theoretical study
Savitski Vasili
Journal of Physics D: Applied Physics Vol 50, pp. 475602, (2017)
Laser spectroscopy of NV- and NV0 colour centres in synthetic diamond
Fraczek Elisabeth, Savitski Vasili G., Dale Matthew, Breeze Ben G., Diggle Phil, Markham Matthew, Bennett Andrew, Dhillon Harpreet, Newton Mark E., Kemp Alan J.
Optical Materials Express Vol 7, pp. 2571-2585, (2017)
http://dx.doi.org/10.1364/OME.7.002571
Laser-related spectroscopic parameters of NV colour centres in diamond
Savitski V. G., Fraczek E., Dale M., Breeze B. G., Dziechciarczyk L., Diggle P., Markham M., Bennett A., Dhillon H., Newton M. E., Kemp A. J.
The European Conference on Lasers and Electro-Optics 2017, (2017)
Optical detection of magnetic resonance in nitrogen vacancy centre ensembles in bulk diamond using an off-resonant probe laser beam
Macrae C. D., Fraczek E., Newton M. E., Dhillon H., Bennett A., Markham M., Diggle P., Breeze B. G., Dale M., Savitski V., Griffin P. F., Kemp A., Riis E., McConnell G.
The European Conference on Lasers and Electro-Optics 2017, (2017)
Femtosecond frequency conversion in diamond under gaussian and bessel beam pumping
Savitski Vasili G., Birch Rolf B., Reilly Sean, Kalashnikov Vladimir L., Kemp Alan J.
The European Conference on Lasers and Electro-Optics 2017, (2017)

more publications

Projects

Fibre-Laser Pumped Diamond Raman Lasers for Lidar and Clear Plastics Welding
Kemp, Alan (Principal Investigator) Savitski, Vasili (Research Co-investigator) Demetriou, Giorgos (Researcher) Dziechciarczyk, Lukasz (Researcher)
"Diamond and fibre are a natural match that provides a platform to take high-power lasers into hitherto unattainable parameter regimes and to serve new applications. Though attractive in its simplicity, this area remains largely unexplored. Here, we propose a partnership that will enable high-impact applications through careful investigation of the underpinning device science. This will lead to fibre-pumped diamond Raman lasers with properties tailored to applications in LIDAR and clear plastics processing. We aim to lay the foundations for this to become the preferred approach for a number of important laser applications.

Fibre lasers are the laser of choice from medicine to materials processing thanks to their reliability, low cost of ownership, proven performance, and outstanding power scalability. While moderate laser parameters and standard wavelengths suffice for many applications, many more require better beam quality, narrower line widths, specific wavelengths, or well-controlled high-energy pulses - but still at hundreds of watts of output power. Fibre lasers can only rarely simultaneously satisfy these requirements. In this project, we aim to overcome these generic limitations of fibre sources by employing diamond to shift fibre lasers further into infrared via stimulated Raman scattering (SRS) with simultaneous brightness enhancement and, in the case of pulses, spectral narrowing towards the transform-limit.

The UK is established as a world leader in fibre laser research and has played a leading role in pioneering the use of diamond in Raman lasers. Both fibre lasers and diamond are recognized as being superbly power scalable thanks to superior optical and thermal properties. Our approach will harness the advantages of fibre systems - efficiency, compactness, and reliability - while modifying their output to better address key industrial challenges. While the combination of fibre and diamond is a platform solution that can address a wide range of wavelength-specific applications, especially in the near IR range, in this project we aim to prove the technology in two areas that are important for our industrial partners. This proposal will deliver a new type of laser that is uniquely capable of the combination of power, brightness, spectral purity and wavelength required for industrially important applications in LIDAR and clear plastic processing."
Period 01-Oct-2016 - 30-Sep-2019
DIAL (Diamond Lasers: Revolutionising Laser Engineering) - ERC Starting Grant)
Kemp, Alan (Principal Investigator) Casula, Riccardo (Researcher) Fraczek, Elisabeth (Researcher) Savitski, Vasili (Researcher)
Period 01-Oct-2011 - 30-Sep-2016

more projects

Address

Institute of Photonics
Technology Innovation Centre

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