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), managed two strands in the ERC project (#278389) and now a Researcher-CoI in EPSRC project "Fibre-laser pumped diamond Raman lasers for LIDAR and clear plastics welding" (EP/P00041X/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

9 W average power, 150 kHz repetition rate diamond Raman laser at 1519 nm, pumped by a Yb fibre amplifier
Dziechciarczyk Łukasz, Huang Zhimeng, Demetriou Giorgos, Cheng Dan, Pidishety Shankar, Feng Yujun, Feng Yutong, Wang Guozheng, Lin Huaiqin, Zhu Sheng, Lin Di, Hawkins Thomas W, Dong Liang, Kemp Alan, Nilsson Johan, Savitski Vasili
2019 Conference on Lasers and Electro-Optics/Europe – European Quantum Electronics Conference (2019)
100 kW peak power external cavity diamond Raman laser at 2.52 μm
Demetriou Giorgos, Kemp Alan J, Savitski Vasili
Optics Express Vol 27, pp. 10296-10303 (2019)
https://doi.org/10.1364/OE.27.010296
External cavity diamond Raman laser at 2.52 μm
Demetriou Giorgos, Savitski Vasili, Kemp Alan
Advanced Solid State Lasers 2018 OSA Laser Congress (2018)
https://doi.org/10.1364/ASSL.2018.AW1A.5
Energy scaling, second Stokes oscillation and Raman gain-guiding in monolithic diamond Raman lasers
Savitski Vasili G, Demetriou Giorgos, Reilly Sean, Liu Hangyu, Gu Erdan, Dawson Martin D, Kemp Alan J
IEEE Journal of Quantum Electronics, pp. 1-8 (2018)
https://doi.org/10.1109/JQE.2018.2875561
Second Stokes oscillation and Raman gain-guiding in micro-lensed monolithic diamond Raman lasers
Savitski Vasili, Demetriou Giorgos, Reilly Sean, Liu Hangyu, Gu Erdan, Dawson Martin, Kemp Alan
8th EPS-QEOD Europhoton Conference (2018)
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 Vol 30, pp. 981-984 (2018)
https://doi.org/10.1109/LPT.2018.2806183

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) Reilly, Sean (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."
01-Jan-2016 - 30-Jan-2019
DIAL (Diamond Lasers: Revolutionising Laser Engineering) - ERC Starting Grant)
Kemp, Alan (Principal Investigator) Birch, Rolf (Researcher) Casula, Riccardo (Researcher) Fraczek, Elisabeth (Researcher) Paboeuf, David (Researcher) Parrotta, Daniele Carmine (Researcher) Reilly, Sean (Researcher) Roth, Peter (Researcher) Savitski, Vasili (Researcher)
01-Jan-2011 - 30-Jan-2016

more projects

Address

Institute of Photonics
Technology Innovation Centre

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