Dr. Oleg Djazovski Profile

Dr. Oleg Djazovski

Senior Optical Engineer at Canadian Space Agency

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Publications (10)

Proceedings Article | 19 October 2023 Presentation + Paper

Development of a 1U new space camera for EMCCD and CCD sensors with enhanced low-light sensitivity

Olivier Daigle, Oleg Djazovski, Jean Dupuis, René Doyon, Farbod Jahandar, Sarah Bouguéroua, Marie-Eve Ducharme, Adam Gilbert, Jeremy Turcotte

Proceedings Volume 12729, 127291C (2023) https://doi.org/10.1117/12.2679002

KEYWORDS: Electron multiplying charge coupled devices, Prototyping, Vibration, Cameras, Design and modelling, Clocks, Temperature metrology, Dark current, Interfaces, Charge-coupled devices

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Proceedings Article | 20 July 2018 Paper

Ultraviolet sensitivity of a teledyne-e2v EMCCD

Neil Rowlands, Ken Smith, Olivier Daigle, Oleg Djazovski, Alan Scott, Alexander Beaton, Andrew Wilson

Proceedings Volume 10709, 107090D (2018) https://doi.org/10.1117/12.2313022

KEYWORDS: Quantum efficiency, Electron multiplying charge coupled devices, Ultraviolet radiation, Photons, Photodiodes, Silicon, Sensors, Visible radiation

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Electron multiplying charged coupled devices (EMCCD’s) can provide significantly greater signal to noise ratios in low light conditions and/or for higher speed readout than traditional CCDs. Due to the electron multiplication before readout, the effective readout noise can be at the sub-electron level, enabling single photon counting. Traditional far UV (150 – 200 nm) imaging detectors have utilized micro-channel plates to detect usually scarce UV photons at low efficiency, amplify them into electron showers which strike a phosphor, allowing a silicon detector array to perform the final detection of the resulting visible light pulse. The typical efficiencies of UV photo detection with MCP systems ranges from a low of a few percent to as high as 25%. Given that the theoretical probability of absorption of UV photons in silicon is at least 30% in this wavelength range, then it should be possible to make use of a photon counting EMCCD to directly detect UV photons that is competitive with MCP performance. We approached Teledyne-e2v and they confirmed that a backside thinned EMCCD with their ‘astro no-coat’ process should provide reasonable quantum efficiency (ie. > 30%) in this range. The primary application in which we are interested is UV imaging of the aurora from space-based platforms. In this application there are system level advantages to replacing an MCP based detector with an EMCCD which is directly sensitive to UV illumination, namely the elimination of a high voltage power supply and higher spatial resolution. An MCP produces an electron shower which degrades image quality and also requires a relatively thick detector window which has to be accommodated in the imager optical design. We acquired five CCD201 engineering model EMCCDs with e2v’s ‘astro no-coat’ process, and incorporated one of these into a standard flexible liquid nitrogen cooled EMCCD camera produced by Nüvü Camēras. Once installed the EMCCD operation was confirmed with standard Nüvü Camēras test procedures. The camera was then mounted in a test vacuum chamber along with a McPherson UV monochromator so that the UV performance could be assessed. A NIST traceable photodiode was used for the absolute calibration. The resulting intrinsic QE was found to be 34% at 180 nm rising to 44% at 150 nm. The quantum yield was found to be quite low, only a few percent at 180 nm rising to only 1.13-1.18 at 150 nm. This is considerably lower than comparable results from CCDs where delta-doping has been used to improve the responsive quantum efficiency and also lower than a Teledyne-e2v CMOS sensor with the same surface treatment.

Proceedings Article | 12 July 2018 Paper

TRL-5 EMCCD controller for space applications

Olivier Daigle, Jérémy Turcotte, Oleg Djazovski, Éric Gloutnay, Frédéric Grandmont, James Veilleux, Deven Patel, Simon Thibault

Proceedings Volume 10698, 106986E (2018) https://doi.org/10.1117/12.2312575

KEYWORDS: Electron multiplying charge coupled devices, Cameras, Coronagraphy, Clocks, Electronics, Amplifiers, Imaging systems, Sensors

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Proceedings Article | 23 July 2014 Paper

EMCCDs: 10 MHz and beyond

Olivier Daigle, Oleg Djazovski, Myriam Francoeur, Denis Laurin, René Doyon

Proceedings Volume 9154, 91540B (2014) https://doi.org/10.1117/12.2054977

KEYWORDS: Electron multiplying charge coupled devices, Clocks, Electrons, Manganese, X-rays, Manufacturing, Data acquisition, Image quality, Adaptive optics, Cameras

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Proceedings Article | 23 July 2014 Paper

Astronomical imaging with EMCCDs using long exposures

Olivier Daigle, Oleg Djazovski, Jean Dupuis, René Doyon, Étienne Artigau

Proceedings Volume 9154, 91540D (2014) https://doi.org/10.1117/12.2056617

KEYWORDS: Signal to noise ratio, Electron multiplying charge coupled devices, Cameras, Image processing, Data acquisition, Data processing, Astronomical imaging, Charge-coupled devices, Photons, Organic light emitting diodes

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Proceedings Article | 11 October 2013 Paper

Electron-multiplying CCDs for future space instruments

Oleg Djazovski, Olivier Daigle, Denis Laurin, Mireille Bedirian, Marie-Eve Ducharme, Étienne Artigau, René Doyon

Proceedings Volume 8915, 89150Q (2013) https://doi.org/10.1117/12.2036206

KEYWORDS: Electron multiplying charge coupled devices, Charge-coupled devices, Cameras, Clocks, Signal to noise ratio, Sensors, Imaging systems, Quantum efficiency, CCD cameras, Astronomy

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Proceedings Article | 25 September 2012 Paper

Characterization results of EMCCDs for extreme low-light imaging

Olivier Daigle, Oleg Djazovski, Denis Laurin, René Doyon, Étienne Artigau

Proceedings Volume 8453, 845303 (2012) https://doi.org/10.1117/12.926385

KEYWORDS: Electron multiplying charge coupled devices, Charge-coupled devices, Cameras, Clocks, Photons, Fourier transforms, Signal to noise ratio, Photon counting, Temperature metrology, Light sources

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Proceedings Article | 15 July 2010 Paper

Detection and repair of radiation induced single event upsets in an FPGA-based readout for TES bolometer arrays

Graeme Smecher, François Aubin, Oleg Djazovski, Matt Dobbs, Gordon Faulkner, Fabio Gulino, Peter Hyland, Kevin MacDermid, Neil Rowlands

Proceedings Volume 7741, 77412U (2010) https://doi.org/10.1117/12.858201

KEYWORDS: Field programmable gate arrays, Logic, Digital signal processing, Bolometers, Space telescopes, Telescopes, Electronics, Sensors, Multiplexing, Control systems

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Proceedings Article | 12 July 2008 Paper

JWST tunable filter imager: etalon prototype test results

D. Touahri, P. Cameron, C. Evans, E. Greenberg, N. Rowlands, A. Scott, R. Doyon, M. Beaulieu, O. Djazovski

Proceedings Volume 7010, 701038 (2008) https://doi.org/10.1117/12.790282

KEYWORDS: Fabry–Perot interferometers, Ferroelectric materials, Coating, James Webb Space Telescope, Prototyping, Tunable filters, Sensors, Imaging systems, Cryogenics, Spectroscopy

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Proceedings Article | 8 September 2006 Paper

Optical sensor technologies at Canadian Space Agency

Oleg Djazovski, Allan Hollinger, Michael Maszkiewicz, Rejean Michaud

Proceedings Volume 6343, 63433K (2006) https://doi.org/10.1117/12.708022

KEYWORDS: Sensors, Satellites, Imaging systems, Detector arrays, Staring arrays, Charge-coupled devices, Aerospace engineering, Infrared sensors, Optical sensors, Infrared imaging

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Showing 5 of 10 publications

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