TYDEX LLC

Saint Petersburg, Russia

TYDEX LLC

Saint Petersburg, Russia
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Kaufmann P.,Mackenzie Presbyterian University | Kaufmann P.,University of Campinas | Abrantes A.,Propertech Ltda. | Bortolucci E.C.,University of Campinas | And 7 more authors.
26th International Symposium on Space Terahertz Technology, ISSTT 2015 | Year: 2015

Recent sub-THz and 30 THz observations revealed an unexpected new spectral component, with fluxes increasing towards THz frequencies, simultaneously with the well known component peaking at microwaves, bringing challenging constraints for interpretation. The knowledge of the complete THz flare spectrum is the essential requirement for understanding the origin of this radiation. We present the concept, fabrication and performance of telescope photometric systems to observe solar flares at 3 and 7 THz from above the atmosphere, named SOLAR-T, and at 0.85 and 1.4 THz from the ground at a high altitude site, named HATS. The innovative optical setup allows observations of the full solar disk with high sensitivity to detect small burst transients (tens of solar flux units) with time resolution of less than one second. The SOLART space experiment uses two Golay cell detectors at the focus of 7.6 cm Cassegrain telescopes. The incoming radiation undergoes low-pass filters made of rough surface primary mirrors and membranes, 3 and 7 THz band-pass filters, and choppers. The system has been integrated to data acquisition and telemetry modules for this application. Tests comprised the whole system performance, on ambient and low pressure and temperature conditions. SOLAR-T is being integrated to U.C. Berkeley gamma-ray GRIPS experiment to be flown on a long duration stratospheric balloon mission over Antarctica. The HATS telescope utilizes the same principles, with a 46 cm rough mirror Newtonian telescope, a Golay cell sensor preceded by low pass filter, and a double window chopper, each one with band pass filters at 0.87 and 1.4 THz. HATS now undergoes operational tests in Brazil, and is planned for operations in 2015 at a site to be selected in the Andes Cordillera, above 5000 m altitude.


Kaufmann P.,Mackenzie Presbyterian University | Fernandes L.O.T.,Mackenzie Presbyterian University | Kudaka A.S.,Mackenzie Presbyterian University | Marcon R.,University of Campinas | And 7 more authors.
SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference Proceedings | Year: 2013

The performance of the double THz photometers system is presented. It is the first detection device conceived to observed solar flare THz emissions on board of stratospheric balloons. The system, named SOLAR-T, has been built, integrated to data acquisition and telemetry modules developed for this application, and tested. It utilizes two Golay cell detectors preceded by low-pass filters, 3 and 7 THz band-pass filters, and choppers. SOLAR-T photometers can detect relative temperature variations smaller than 1 K with sub second time resolution. It is intended to determine the still unrevealed spectral shape of the mysterious THz solar flares emissions. The experiment is planned to fly on board of two long-duration stratospheric balloon flights over Antarctica and Russia in 2014-2016. © 2013 IEEE.


Kaveev A.K.,TYDEX LLC | Kropotov G.I.,TYDEX LLC | Tsypishka D.I.,TYDEX LLC | Tzibizov I.A.,TYDEX LLC | And 2 more authors.
Applied Optics | Year: 2014

We present the results of calculation and experimental testing of the tunable wavelength terahertz polarization converter represented by a set of plane-parallel birefringent plates with an in-plane birefringence axis. An experimental device has been produced and tested. The calculations show that the effect of interference between the interfaces, including air gaps, may be neglected. The considered device may be used as a simple narrow achromatic waveplate, or a Solc band pass filter for the specified wavelength. © 2014 Optical Society of America.


Agafonov A.N.,Samara State Aerospace University | Volodkin B.O.,Samara State Aerospace University | Kaveev A.K.,Tydex LLC | Kachalov D.G.,Samara State Aerospace University | And 6 more authors.
Computer Optics | Year: 2015

A binary silicon diffractive optical element (DOE) focusing laser radiation onto an axial segment (or a DOE with elongated focal depth) for the terahertz spectral range has been designed and characterized using terahertz radiation of the Novosibirsk Free Electron Laser (NovoFEL). © 2015, Institution of Russian Academy of Sciences. All rights reserved.


Agafonov A.N.,Samara State Aerospace University | Choporova Y.Y.,Samara State Aerospace University | Kaveev A.K.,Samara State Aerospace University | Knyazev B.A.,Samara State Aerospace University | And 4 more authors.
Applied Optics | Year: 2015

This paper presents experimental results on the formation of given laser modes from an illuminating Gaussian beam of the terahertz Novosibirsk free electron laser at a wavelength of 141 μm. Binary silicon diffractive optical elements were applied. The experimental results obtained are in good agreement with the results of computer simulation. © 2015 Optical Society of America.


Agafonov A.N.,Samara State Aerospace University | Volodkin B.O.,Samara State Aerospace University | Volotovsky S.G.,Samara State Aerospace University | Kaveev A.K.,Tydex LLC | And 7 more authors.
Optical Memory and Neural Networks (Information Optics) | Year: 2014

Binary silicon-based diffractive optical element (DOE)—Gaussian-to-Square focuser (diameter of aperture is 30 mm) for the terahertz spectral range has been designed and characterized using terahertz radiation of the Novosibirsk Free Electron Laser (NovoFEL) at the wavelength of 141 μm. The preliminary experiments have demonstrated feasibility of application of binary silicon DOE for focusing of terahertz radiation into pre-given focal domain. © 2014, Allerton Press, Inc.


Agafonov A.N.,Samara State Aerospace University | Volodkin B.O.,Samara State Aerospace University | Kachalov D.G.,Samara State Aerospace University | Knyazev B.A.,Novosibirsk State University | And 6 more authors.
Journal of Modern Optics | Year: 2016

We demonstrate results of studies of a silicon binary diffractive optical element (DOE) focusing a terahertz laser Gaussian beam into a paraxial segment. The characteristics of the DOE were examined on a Novosibirsk Free Electron Laser beam of 141-m wavelength. © 2015 Taylor & Francis.


Agafonov A.N.,Samara State Aerospace University | Volodkin B.O.,Samara State Aerospace University | Kaveev A.K.,Tydex LLC | Knyazev B.A.,Novosibirsk State University | And 4 more authors.
Computer Optics | Year: 2014

Experimental results on forming pre-given laser modes from an illuminating Gaussian beam of a terahertz Novosibirsk Free Electron Laser (NovoFEL) at the wavelength of 141 mm by use of binary silicon diffractive optical elements are presented. The experimental results are in good agreement with the results of computer simulation. © 2014, Institution of Russian Academy of Sciences. All rights reserved.


Kaufmann P.,Mackenzie Presbyterian University | Kaufmann P.,University of Campinas | Marcon R.,University of Campinas | Abrantes A.,Propertech Ltda. | And 10 more authors.
Experimental Astronomy | Year: 2014

The search for the still unrevealed spectral shape of the mysterious THz solar flare emissions is one of the current most challenging research issues. The concept, fabrication and performance of a double THz photometer system, named SOLAR-T, is presented. Its innovative optical setup allows observations of the full solar disk and the detection of small burst transients at the same time. The detecting system was constructed to observe solar flare THz emissions on board of stratospheric balloons. The system has been integrated to data acquisition and telemetry modules for this application. SOLAR-T uses two Golay cell detectors preceded by low-pass filters made of rough surface primary mirrors and membranes, 3 and 7 THz band-pass filters, and choppers. Its photometers can detect small solar bursts (tens of solar flux units) with sub second time resolution. Tests have been conducted to confirm the entire system performance, on ambient and low pressure and temperature conditions. An artificial Sun setup was developed to simulate performance on actual observations. The experiment is planned to be on board of two long-duration stratospheric balloon flights over Antarctica and Russia in 2014–2016. © 2014, Springer Science+Business Media Dordrecht.


Kaveev A.K.,TYDEX LLC | Kropotov G.I.,TYDEX LLC | Tsypishka D.I.,TYDEX LLC | Tzibizov I.A.,TYDEX LLC | And 2 more authors.
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz | Year: 2014

We present the results of calculation and experimental testing of the tunable wavelength terahertz polarization converter (TWPC) represented by set of planeparallel birefringent plates with in-plane birefringence axis. An experimental device has been produced and tested. The calculations show that the effect of interference between the interfaces, including air gaps, may be neglected. Considered device may be used as the simple narrow achromatic waveplate, or Solc band pass filter for the specified wavelength. © 2014 IEEE.

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