Dr. Oleg V. Chekhlov Profile

Dr. Oleg V. Chekhlov

Laser Scientist at STFC Rutherford Appleton Lab

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Author

Publications (9)

Proceedings Article | 13 May 2019 Presentation

Development of a PW class OPCPA beamline for the Vulcan Laser Facility (Conference Presentation)

Ian Musgrave, Giedre Archipovaite, Steve Blake, Nicola Booth, Oleg Chekhlov, Rob Clarke, Rob Heathcote, Cristina Hernandez-Gomez, Marco Galimberti, Mario Galletti, Pedro Oliveira, Dave Neely, Waseem Shaikh, Trevor Winstone, John Collier, Brian Wyborn

Proceedings Volume 11034, 110340K (2019) https://doi.org/10.1117/12.2523890

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Proceedings Article | 13 May 2019 Presentation

Quantitatively evaluating impact of large optics in the stretcher on compressed pulse contrast (Conference Presentation)

Yunxin Tang, David Egan, Chris Hooker, Chris Gregory, Oleg Chekhlov, Cristina Hernandez-Gomez, John Collier, Rajeev Pattathil

Proceedings Volume 11034, 110340E (2019) https://doi.org/10.1117/12.2523003

KEYWORDS: Mirrors, Surface roughness, Laser systems engineering, Gold, Spatial resolution, Pulsed laser operation, Sapphire lasers, Gemini Observatory, High power lasers

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We are currently focusing on the improvement of contrast pedestal (CP) in the compressed laser pulse of PW Ti:Sapphire lasers. In our previous studies, we have identified the stretcher in our laser system as the source of CP. In order to underpin the true origins of CP, we have quantitatively characterised the surface quality of large optics used in the Gemini laser stretcher, where the laser beam is spatially dispersed and the spectral phase noise is induced by the optical surface roughness. We have measured the surface profiles of 2 different gold gratings, the new and old grating, and back mirror to a very high precision (~ a fraction of nm) by using ZYGO Dynafiz, with a spatial resolution of ~50µm over a width up to ~320mm, an unprecedented combination of very high spatial resolution with a very wide field of view. The surface roughness of the large curved mirror was determined experimentally. We have developed a simple physical model to deal with the influence of the surface roughness on the contrast pedestal. Based on the measured surface profiles and by taking the actual laser beam size into account, we are able to determine the spectral phase noise induced by the optical surface roughness in the stretcher. Consequently, we are able to accurately evaluate the impact of individual large optics in the stretcher and an overall impact of the stretcher on the contrast pedestal. The calculated contrast induced by both stretches with the new and old gratings are in an excellent agreement with the experimental results measured by the Sequoia scan. For the stretcher with the old grating, the grating is the dominant impact factor on the contrast. However, for the stretcher with the new gold grating of higher quality, the impact of the curved mirror on the contrast is comparable to that of grating. This implies that the influence of curved mirror on the contrast pedestal becomes more significant when the surface quality of grating is further improved. It is clearly observed that the impact of back mirror on the contrast is more than one order of magnitude lower than that of gratings and also much lower than that of curved mirror. In conclusion, we have demonstrated a novel method to evaluate the impact of large optics in the stretcher on the contrast pedestal by precisely quantitative characterization of optical surface quality. It is possible to accurately predict the contrast pedestal based on the stretcher configuration and precise characterisation of the optical surface in the stretcher prior to the construction of actual CPA high power laser system.

Proceedings Article | 15 February 2018 Presentation + Paper

100J-level nanosecond pulsed Yb:YAG cryo-cooled DPSSL amplifier

J. Smith, T. Butcher, P. Mason, K. Ertel, P. J. Phillips, S. Banerjee, M. De Vido, O. Chekhlov, M. Divoky, J. Pilar, W. Shaikh, C. Hooker, A. Lucianetti, C. Hernandez Gomez, T. Mocek, C. Edwards, J. Collier

Proceedings Volume 10511, 105110T (2018) https://doi.org/10.1117/12.2289579

KEYWORDS: Optical amplifiers, Amplifiers, Head, Laser systems engineering, Diodes, Laser applications, Ceramics, Beam shaping, Pulsed laser operation, Semiconductor lasers

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Proceedings Article | 11 May 2017 Presentation + Paper

A 100 J-level nanosecond DPSSL for high energy density experiments

Thomas Butcher, Paul Mason, Saumyabrata Banerjee, Klaus Ertel, P. Jonathan Phillips, Jodie Smith, Mariastefania De Vido, Oleg Chekhlov, Martin Divoky, Jan Pilat, Gerd Priebe, Toma Toncian, Waseem Shaikh, Chris Hooker, Antonio Lucianetti, Cristina Hernandez-Gomez, Tomas Mocek, Chris Edwards, John Collier

Proceedings Volume 10238, 1023802 (2017) https://doi.org/10.1117/12.2265765

KEYWORDS: Optical amplifiers, Computer aided design, Fiber amplifiers, Diagnostics, Ytterbium, Absorption, Head, Cryogenics, Materials processing, Diode pumped solid state lasers, Laser applications, Pulsed laser operation, Laser energy, Amplifiers, X-ray sources, Laser development, Ceramics

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Proceedings Article | 17 February 2017 Presentation + Paper

A 100J-level nanosecond pulsed DPSSL for pumping high-efficiency, high-repetition rate PW-class lasers

M. De Vido, K. Ertel, P. Mason, S. Banerjee, P. J. Phillips, J. Smith, T. Butcher, O. Chekhlov, M. Divoky, J. Pilar, Chris Hooker, W. Shaikh, A. Lucianetti, C. Hernandez-Gomez, T. Mocek, C. Edwards, J. Collier

Proceedings Volume 10082, 100820M (2017) https://doi.org/10.1117/12.2250509

KEYWORDS: Optical amplifiers, Pulsed laser operation, Ceramics, Laser applications, Prototyping, Laser systems engineering, Energy efficiency, Cryogenics, Semiconductor lasers, Harmonic generation

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Proceedings Article | 27 April 2016 Paper

High energy diode-pumped solid-state laser development at the Central Laser Facility

Paul Mason, Saumyabrata Banerjee, Klaus Ertel, P. Jonathan Phillips, Thomas Butcher, Jodie Smith, Mariastefania De Vido, Oleg Chekhlov, Cristina Hernandez-Gomez, Chris Edwards, John Collier

Proceedings Volume 9893, 989309 (2016) https://doi.org/10.1117/12.2230317

KEYWORDS: Semiconductor lasers, Pulsed laser operation, Optical amplifiers, Laser applications, Diode pumped solid state lasers, Laser processing, Laser systems engineering, Laser development, Ceramics, Cryogenics, Semiconductor lasers, Pulsed laser operation, Optical amplifiers, Laser applications, Head, Amplifiers, Prototyping

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Proceedings Article | 12 May 2015 Paper

DiPOLE100: A 100 J, 10 Hz DPSSL using cryogenic gas cooled Yb:YAG multi slab amplifier technology

Paul Mason, Saumyabrata Banerjee, Klaus Ertel, P. Jonathan Phillips, Thomas Butcher, Jodie Smith, Mariastefania De Vido, Stephanie Tomlinson, Oleg Chekhlov, Waseem Shaikh, Steve Blake, Paul Holligan, Martin Divoky, Jan Pilar, Cristina Hernandez-Gomez, Justin Greenhalgh, John Collier

Proceedings Volume 9513, 951302 (2015) https://doi.org/10.1117/12.2180086

KEYWORDS: Optical amplifiers, Head, Cryogenics, Diodes, Amplifiers, Pulsed laser operation, Mirrors, Adaptive optics, Laser applications, Fiber amplifiers

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Proceedings Article | 20 May 2010 Paper

Extreme light infrastructure: laser architecture and major challenges

J.-P. Chambaret, O. Chekhlov, G. Cheriaux, J. Collier, R. Dabu, P. Dombi, A. Dunne, K. Ertel, P. Georges, J. Hebling, J. Hein, C. Hernandez-Gomez, C. Hooker, S. Karsch, G. Korn, F. Krausz, C. Le Blanc, Zs. Major, F. Mathieu, T. Metzger, G. Mourou, P. Nickles, K. Osvay, B. Rus, W. Sandner, G. Szabó, D. Ursescu, K. Varjú

Proceedings Volume 7721, 77211D (2010) https://doi.org/10.1117/12.854687

KEYWORDS: Optical amplifiers, Amplifiers, Laser applications, Crystals, Laser systems engineering, Semiconductor lasers, Laser development, Physics, Nuclear physics, Laser crystals

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Proceedings Article | 25 July 2007 Paper

Development of petawatt laser amplification systems at the Central Laser Facility

O. Chekhlov, E. Divall, K. Ertel, S. Hawkes, C. Hooker, I. Ross, P. Matousek, C. Hernandez-Gomez, I. Musgrave, Y. Tang, T. Winstone, D. Neely, R. Clarke, P. Foster, S. Hancock, B. Wyborn, J. Collier

Proceedings Volume 6735, 67350J (2007) https://doi.org/10.1117/12.753222

KEYWORDS: Optical amplifiers, Crystals, Laser systems engineering, Gemini Observatory, Telescopes, Laser development, Mirrors, Colorimetry, Sapphire, Laser crystals

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Showing 5 of 9 publications

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