Dr. Alexander Tavrov Profile

Dr. Alexander Tavrov

at Space Research Institute of the RAS

SPIE Involvement:

Author

Publications (36)

Proceedings Article | 13 December 2020 Presentation + Paper

UVSPEX/WSO-UV for Earth-like exoplanetary oxygen exospheres

Shingo Kameda, Go Murakami, Alexander Tavrov, Keigo Enya, M. Sachkov, Masahiro Ikoma, Norio Narita, Oleg Korablev

Proceedings Volume 11444, 114440L (2020) https://doi.org/10.1117/12.2576260

KEYWORDS: Oxygen, Ultraviolet radiation, Solar system, Planets, Exoplanets, Stars, Spectrographs, Space telescopes, Space observatories, Optical instrument design

Read Abstract +

SPIE Journal Paper | 1 October 2018

Stellar imaging coronagraph and exoplanet coronal spectrometer: two additional instruments for exoplanet exploration onboard the WSO-UV 1.7-m orbital telescope

Alexander Tavrov, Shingo Kameda, Andrey Yudaev, Ilia Dzyuban, Alexander Kiselev, Inna Shashkova, Oleg Korablev, Mikhail Sachkov, Jun Nishikawa, Motohide Tamura, Go Murakami, Keigo Enya, Masahiro Ikoma, Norio Narita

JATIS, Vol. 4, Issue 04, 044001, (October 2018) https://doi.org/10.1117/12.10.1117/1.JATIS.4.4.044001

KEYWORDS: Coronagraphy, Exoplanets, Telescopes, Ultraviolet radiation, Stars, Spectroscopy, Sensors, Planets, Spectrographs, Oxygen

Read Abstract +

The World Space Observatory for Ultraviolet (WSO-UV) is an orbital optical telescope with a 1.7-m diameter primary mirror currently under development. The WSO-UV is aimed to operate in the 115- to 310-nm UV spectral range. Its two major science instruments are UV spectrographs and UV imaging field cameras with filter wheels. The WSO-UV project is currently in the implementation phase, with a tentative launch date in 2023. As designed, the telescope field of view in the focal plane is not fully occupied by instruments. Recently, two additional instruments devoted to exoplanets have been proposed for WSO-UV, which are the focus of this paper. UVSPEX, a UV-spectrograph for exoplanets, aims to determine atomic hydrogen and oxygen abundance in the exospheres of terrestrial exoplanets. The spectral range is 115 to 130 nm, which enables simultaneous measurement of hydrogen and oxygen emission intensities during an exoplanet transit. A study of exosphere transit photometric curves can help differentiate among different types of rocky planets. The exospheric temperature of an Earth-like planet is much higher than that of a Venus-like planet because of the low mixing ratio of the dominant coolant (CO2) in the upper atmosphere of the former, which causes a large difference in transit depth at the oxygen emission line. Thus, whether the terrestrial exoplanet is Earth-like, Venus-like, or other can be determined. A Stellar Coronagraph for Exoplanet Direct Imaging (SCEDI) is aimed to directly detect the starlight reflected from exoplanets orbiting their parent stars or from the stellar vicinity including circumstellar disks, dust, and clumps. SCEDI will create an achromatic (optimized to 420- to 700-nm wavelength range), high-contrast stellocentric coronagraphic image of a circumstellar vicinity. The two instruments, such as UVSPEX and SCEDI, share common power and control modules. The present communication outlines the science goals of both proposed instruments and explains some of their engineering features.

Proceedings Article | 17 November 2017 Open Access

Space telescopes planetary monitoring (PM) and Zvezdny (eng. star) patrol (ZP) for planetary science and exoplanets exploration

Alexander Tavrov, Pavel Frolov, Oleg Korablev, Nikolai Vedenkin, Sergey Barabanov

Proceedings Volume 10563, 105633D (2017) https://doi.org/10.1117/12.2304170

KEYWORDS: Space telescopes, Telescopes, Planets, Phase modulation, Exoplanets, Coronagraphy, Stars, Solar system, Spectroscopy, Space operations

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 29 July 2016 Paper

Achromatic interfero-coronagraph with variable rotational shear in laboratory experiments

Pavel Frolov, Alexander Kiselev, Alexander Tavrov

Proceedings Volume 9904, 990454 (2016) https://doi.org/10.1117/12.2232523

KEYWORDS: Stars, Exoplanets, Planets, Telescopes, Coronagraphy, Neodymium, Prototyping, Polarization, Space telescopes, Ear

Read Abstract +

Proceedings Article | 27 July 2016 Paper

Precise wavefront control for stellar coronagraphy: possibilities by a common-path extremely unbalanced interferometer

Ilia Dziuban, Inna Shashkova, Pavel Frolov, Yulia Bezymyannikova, Alexander Tavrov

Proceedings Volume 9909, 99095B (2016) https://doi.org/10.1117/12.2232506

KEYWORDS: Interferometers, Adaptive optics, Coronagraphy, Exoplanets, Wavefronts, Interferometers, Adaptive optics, Coronagraphy, Exoplanets, Actuators, Point spread functions, Error analysis, Polonium, Nulling interferometry

Read Abstract +

SPIE Journal Paper | 24 December 2015

Extremely unbalanced interferometer for precise wavefront control in stellar coronagraphy

Inna Shashkova, Boris Shkursky, Pavel Frolov, Yulia Bezymyannikova, Alexander Kiselev, Jun Nishikawa, Alexander Tavrov

JATIS, Vol. 2, Issue 01, 011011, (December 2015) https://doi.org/10.1117/12.10.1117/1.JATIS.2.1.011011

KEYWORDS: Interferometers, Wavefronts, Coronagraphy, Adaptive optics, Beam splitters, Point spread functions, Exoplanets, Phase shift keying, Control systems, Space telescopes

Read Abstract +

SPIE Journal Paper | 28 October 2015

Achromatic interfero-coronagraph with variable rotational shear: reducing of star leakage effect, white light nulling with lab prototype

Pavel Frolov, Inna Shashkova, Yuliya Bezymyannikova, Alexander Kiselev, Alexander Tavrov

JATIS, Vol. 2, Issue 01, 011002, (October 2015) https://doi.org/10.1117/12.10.1117/1.JATIS.2.1.011002

KEYWORDS: Stars, Coronagraphy, Planets, Telescopes, Prototyping, Polarization, Space telescopes, Mirrors, Exoplanets, Interferometers

Read Abstract +

Proceedings Article | 21 September 2012 Paper

A coronagraph system with unbalanced nulling interferometer: progress of dynamic range

Jun Nishikawa, Kaito Yokochi, Naoshi Murakami, Lyu Abe, Takayuki Kotani, Motohide Tamura, Takashi Kurokawa, Alexander Tavrov, Mitsuo Takeda, Hiroshi Murakami

Proceedings Volume 8442, 84425D (2012) https://doi.org/10.1117/12.925792

KEYWORDS: Coronagraphy, Wavefronts, Adaptive optics, Interferometers, Wavefront aberrations, Speckle, Picture Archiving and Communication System, Nulling interferometry, Mirrors, Feedback control

Read Abstract +

Proceedings Article | 11 August 2010 Paper

A coronagraph system with unbalanced nulling interferometer: progress of wavefront correction

Jun Nishikawa, Kaito Yokochi, Naoshi Murakami, Lyu Abe, Takayuki Kotani, Motohide Tamura, Takashi Kurokawa, Alexander Tavrov, Mitsuo Takeda, Hiroshi Murakami

Proceedings Volume 7731, 77314O (2010) https://doi.org/10.1117/12.856945

KEYWORDS: Coronagraphy, Wavefronts, Adaptive optics, Nulling interferometry, Mirrors, Wavefront aberrations, Interferometers, Speckle, Beam splitters, Picture Archiving and Communication System

Read Abstract +

Proceedings Article | 25 July 2008 Paper

HiCIAO: the Subaru Telescope's new high-contrast coronographic imager for adaptive optics

Klaus Hodapp, Ryuji Suzuki, Motohide Tamura, Lyu Abe, Hiroshi Suto, Ryo Kandori, Junichi Morino, Tetsuo Nishimura, Hideki Takami, Olivier Guyon, Shane Jacobson, Vern Stahlberger, Hubert Yamada, Richard Shelton, Jun Hashimoto, Alexander Tavrov, Jun Nishikawa, Nobuharu Ukita, Hideyuki Izumiura, Masahiko Hayashi, Tadashi Nakajima, Toru Yamada, Tomonori Usuda

Proceedings Volume 7014, 701419 (2008) https://doi.org/10.1117/12.788088

KEYWORDS: Adaptive optics, Telescopes, Imaging systems, Optical filters, Infrared cameras, Methane, Absorption, Sensors, Prisms, Image filtering

Read Abstract +

Proceedings Article | 12 July 2008 Paper

Virtual wavefront compensation and speckle reduction in coronagraph by unbalanced nulling interferometer (UNI) and phase and amplitude correction (PAC)

J. Nishikawa, K. Yokochi, L. Abe, N. Murakami, T. Kotani, M. Tamura, T. Kurokawa, A. V. Tavrov, M. Takeda

Proceedings Volume 7010, 70102A (2008) https://doi.org/10.1117/12.788895

KEYWORDS: Coronagraphy, Wavefronts, Adaptive optics, Picture Archiving and Communication System, Speckle, Wavefront aberrations, Interferometers, Stars, Wavefront compensation, Phase interferometry

Read Abstract +

Proceedings Article | 28 June 2006 Paper

Concept and science of HiCIAO: high contrast instrument for the Subaru next generation adaptive optics

Motohide Tamura, Klaus Hodapp, Hideki Takami, Lyu Abe, Hiroshi Suto, Olivier Guyon, Shane Jacobson, Ryo Kandori, Jun-Ichi Morino, Naoshi Murakami, Vern Stahlberger, Ryuji Suzuki, Alexander Tavrov, Hubert Yamada, Jun Nishikawa, Nobuharu Ukita, Jun Hashimoto, Hideyuki Izumiura, Masahiko Hayashi, Tadashi Nakajima, Tetsuo Nishimura

Proceedings Volume 6269, 62690V (2006) https://doi.org/10.1117/12.670742

KEYWORDS: Coronagraphy, Adaptive optics, Stars, Telescopes, Exoplanets, Polarization, Astronomy, Optical filters, Space telescopes, Actuators

Read Abstract +

Proceedings Article | 7 March 2006 Paper

Visualization of Berry spin-redirection phase in polarization interferometer with geometric shear

Alexander Tavrov, Yoko Miyamoto, Tsutomu Kawabata, Mitsuo Takeda, Vladimir Andreev

Proceedings Volume 4101, (2006) https://doi.org/10.1117/12.498420

KEYWORDS: Polarization, Beam splitters, Lithium, Visualization, Mirrors, Microscopes, Phase interferometry, Interferometers, Interferometry, Objectives

Read Abstract +

Proceedings Article | 31 August 2005 Paper

3D common-path interferometer: achromatic nulling of on-axial light

Alexander Tavrov, Yukitoshi Otani, Takashi Kurokawa, Mitsuo Takeda

Proceedings Volume 5905, 59051A (2005) https://doi.org/10.1117/12.620027

KEYWORDS: Interferometers, Light, Polarization, Beam splitters, Charge-coupled devices, Nulling interferometry, Mirrors, Destructive interference, Phase shifts, Coronagraphy

Read Abstract +

Proceedings Article | 20 October 2004 Paper

Achromatic coronagraph based on out-of-plane common-path nulling interferometer

Alexander Tavrov, Yosuke Tanaka, Tatsutoshi Shioda, Takashi Kurokawa, Mitsuo Takeda

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.550759

KEYWORDS: Interferometers, Coronagraphy, Light, Stellar interferometry, Stars, Geometrical optics, Polarization, Phase shifts, Destructive interference

Read Abstract +

Proceedings Article | 4 November 2003 Paper

Comparative linewidth measurements on chrome and MoSi structures using newly developed microscopy methods

Bernd Bodermann, Werner Mirande, Norbert Kerwien, Alexander Tavrov, Michael Totzeck, Hans Tiziani

Proceedings Volume 5188, (2003) https://doi.org/10.1117/12.509713

KEYWORDS: Microscopy, Polarization, Diffraction, Photomasks, Optical microscopy, Interferometry, Grazing incidence, Phase shifting, Microscopes, Chromium

Read Abstract +

Proceedings Article | 30 May 2003 Paper

Vector simulations of dark beam interaction with nanoscale surface features

Alexander Tavrov, Norbert Kerwien, Reinhard Berger, Hans Tiziani, Michael Totzeck, Boris Spektor, Josef Shamir, Gregory Toker, Andrei Brunfeld

Proceedings Volume 5144, (2003) https://doi.org/10.1117/12.500588

KEYWORDS: Polarization, Microscopes, Signal detection, Microscopy, Photodetectors, Interference (communication), Diffraction, Signal to noise ratio, Objectives, Inspection

Read Abstract +

Proceedings Article | 30 May 2003 Paper

Rapid quantitative phase imaging using phase retrieval for optical metrology of phase-shifting masks

Norbert Kerwien, Alexander Tavrov, Jochen Kaufmann, Wolfgang Osten, Hans Tiziani

Proceedings Volume 5144, (2003) https://doi.org/10.1117/12.500705

KEYWORDS: Wavefronts, Phase retrieval, Photomasks, Microscopy, Phase shifts, Inspection, Phase measurement, Interferometry, Microscopes, Diffraction

Read Abstract +

SPIE Journal Paper | 1 August 2002

Rigorous coupled-wave analysis calculus of submicrometer interference pattern and resolving edge position versus signal-to-noise ratio

Alexander Tavrov, Michael Totzeck, Norbert Kerwien, Hans Tiziani

OE, Vol. 41, Issue 08, (August 2002) https://doi.org/10.1117/12.10.1117/1.1490589

KEYWORDS: Signal to noise ratio, Polarization, Microscopes, Image analysis, Interference (communication), Interferometry, Silicon, Optical engineering, Calculus, Microscopy

Proceedings Article | 20 June 2002 Paper

Quantitative Zernike phase-contrast microscopy by use of structured birefringent pupil-filters and phase-shift evaluation

Michael Totzeck, Norbert Kerwien, Alexander Tavrov, Eva Rosenthal, Hans Tiziani

Proceedings Volume 4777, (2002) https://doi.org/10.1117/12.472223

KEYWORDS: Wave plates, Polarization, Phase shifts, Interferometry, Microscopy, Polarizers, Liquid crystals, Mica, Phase interferometry, Numerical simulations

Read Abstract +

Proceedings Article | 20 June 2002 Paper

Inspection of sub-wavelength structures and zero-order gratings using polarization interferometry

Michael Totzeck, Alexander Tavrov, Norbert Kerwien, Hans Tiziani

Proceedings Volume 4777, (2002) https://doi.org/10.1117/12.472233

KEYWORDS: Polarization, Interferometry, Silicon, Dielectric polarization, Phase interferometry, Birefringence, Refractive index, Polarizers, Phase shifts, Microscopy

Read Abstract +

Proceedings Article | 13 August 1999 Paper

Efficient algorithm for the evaluation of geometric shift of polarization in interferometric and polarimetric systems

Alexander Tavrov, Yoko Miyamoto, Tsutomu Kawabata, Mitsuo Takeda, Vladimir Andreev

Proceedings Volume 3744, (1999) https://doi.org/10.1117/12.357732

Read Abstract +

Proceedings Article | 12 December 1997 Paper

Noncontact interferometric measurement of vibration parameters under diffuse light reflection

Alexander Tavrov, I. Mishalevsky, Dmitry Ublinsky

Proceedings Volume 3173, (1997) https://doi.org/10.1117/12.294522

KEYWORDS: Interferometry, Interferometers

Read Abstract +

Proceedings Article | 21 November 1997 Paper

Spreading of the combustion wave in SiO2-Al systems

Vladimir Maltsev, Galina Gafiyatulina, Alexander Tavrov

Proceedings Volume 3172, (1997) https://doi.org/10.1117/12.293419

KEYWORDS: Combustion, Wave propagation, Aluminum, Visualization, Particles, Video processing, Video, Thermodynamics, Velocity measurements, X-ray diffraction

Read Abstract +

Proceedings Article | 3 October 1997 Paper

Geometrical phase measurement with a Michelson interferometer for microsurface characterization

Alexander Tavrov, Dmitry Ublinsky, Vladimir Andreev

Proceedings Volume 3121, (1997) https://doi.org/10.1117/12.283871

KEYWORDS: Interferometers, Michelson interferometers, Polarization, Geometrical optics, Phase measurement, Measurement devices, Refractive index, Optical testing, Mineralogy, Interferometry

Read Abstract +

Proceedings Article | 1 September 1996 Paper

The role of topological phases in the microinterferogram formation

A. Tavrov

Proceedings Volume 2778, 2778EI (1996) https://doi.org/10.1117/12.2316211

Read Abstract +

Proceedings Article | 17 June 1996 Paper

Interferometry with respect to topological phases

Alexander Tavrov, Vladimir Andreev, Dmitry Ublinsky

Proceedings Volume 2763, (1996) https://doi.org/10.1117/12.243279

KEYWORDS: Polarization, Interferometry, Interferometers, Phase shifts, Optical spheres, Wavefronts, Calculus, Computer simulations, Latex, Nanotechnology

Read Abstract +

Proceedings Article | 13 February 1996 Paper

Measurement of the motion and surface topology of the living organisms using computer-aided laser microscopy

Alexander Tavrov, R. Masselink, H. Schreier, M. Vicker

Proceedings Volume 2729, (1996) https://doi.org/10.1117/12.233013

Read Abstract +

Proceedings Article | 1 February 1995 Paper

Computer-aided laser microscopy for dynamics and topology inspection in living organisms

Alexander Tavrov, R. Masselink, H. Schreier, M. Vicker

Proceedings Volume 2329, (1995) https://doi.org/10.1117/12.200900

KEYWORDS: Motion measurement, Organisms, Statistical analysis, Microscopy, Inspection, 3D metrology, Sensors, Video, Visualization, Geometrical optics

Read Abstract +

Proceedings Article | 12 December 1994 Paper

Diffraction stability of fragments of polarization and phase images

Alexander Tavrov

Proceedings Volume 2340, (1994) https://doi.org/10.1117/12.195898

KEYWORDS: Polarization, Diffraction, Super resolution, Wavefronts, Image resolution, Photodetectors, Lithium, Optical activity, Transform theory, Convolution

Read Abstract +

Proceedings Article | 1 March 1994 Paper

Wavefront dislocations and phase image formation inside diffraction spot

Alexander Tavrov, Vladimir Tychinsky

Proceedings Volume 2004, (1994) https://doi.org/10.1117/12.172614

KEYWORDS: Wavefronts, Diffraction, Polarization, Phase contrast, Image enhancement, Image acquisition, Image analysis, Interferometry, Image processing, Phase shifts

Read Abstract +

Proceedings Article | 1 August 1992 Paper

Three-dimensional living cell imaging with high spatial and time resolutions

Vladimir Tychinsky, Alexander Tavrov, Dmitry Shepelsky, Tatiana Vyshenskaia

Proceedings Volume 1647, (1992) https://doi.org/10.1117/12.60213

KEYWORDS: Spatial resolution, Image resolution, 3D image processing, Microscopes, Data processing, Medicine, Biology, Microorganisms, Super resolution, Software development

Read Abstract +

Proceedings Article | 1 June 1992 Paper

Optical 3D monitoring VLSI structures

Vladimir Tychinsky, Alexander Tavrov

Proceedings Volume 1673, (1992) https://doi.org/10.1117/12.59838

KEYWORDS: Spatial resolution, Very large scale integration, Microscopes, Resolution enhancement technologies, Phase measurement, 3D metrology, Radio optics, Diffraction, Semiconductors, Super resolution

Read Abstract +

Proceedings Article | 1 January 1992 Paper

Properties of the phase images inside the airy disk (Proceedings Only)

Vladimir Tychinsky, Alexander Tavrov

Proceedings Volume 1553, (1992) https://doi.org/10.1117/12.135327

KEYWORDS: Spatial resolution, Microscopes, Resolution enhancement technologies, Super resolution, Phase measurement, Diffraction, Semiconductors, Wavefronts, Software development, Astatine

Read Abstract +

Proceedings Article | 1 October 1991 Paper

Wavefront dislocations and phase object registering inside the airy disk

Vladimir Tychinsky, Alexander Tavrov

Proceedings Volume 1500, (1991) https://doi.org/10.1117/12.46830

KEYWORDS: Wavefronts, Microscopes, Spatial resolution, Super resolution, 3D image processing, Phase measurement, Microscopy, Digital image correlation, Semiconductors, Phase conjugation

Read Abstract +

Proceedings Article | 1 August 1990 Paper

Laser computer-aided phase microscope with 10-nm resolution

Vladimir Tychinsky, Alexander Tavrov

Proceedings Volume 1265, (1990) https://doi.org/10.1117/12.20231

KEYWORDS: Microscopes, Phase measurement, Wavefronts, Point spread functions, Electronics, Very large scale integration, Inspection, Objectives, Sensors, Scientific research

Read Abstract +

Showing 5 of 36 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years