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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:07 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Investigations of proton irradiation effects on IR windows
Authors:
D. SPOREA1, Laura MIHAI1, A. STANCALIE1, M. STRATICIUC2, I. BURDUCEA2
Affiliation:
(1)National Institute for Laser, Plasma and Radiation Physics, Magurele, Romania
(2)”Horia Hulubei” National Institute of Physics and Nuclear Engineering,
Magurele, Romania
E-mail
Keywords:
Abstract:
Nowadays, quantum cascade lasers (QCL) are commercially available from different manufacturers, having a variety of central wavelengths, which recommend them to be included in equipments for advanced spectroscopy, chemical imaging, and as a replacement for Fourier transform IR (FTIR) spectrometers in “finger detection” applications. In the last few years they call upon the attention of experts for applications related to astronomy, astrophysics, astrochemistry, space missions. Focusing on such aspects, the ECSA (Evaluation of Components for Space Applications) project started to evaluate the behavior of various mid-IR optical materials under gamma, proton, electron beam and alpha particles irradiations, in order to monitor off-line, and when possible on-line the irradiation induced changes.The present contribution refers to the investigation of four IR optical materials (CaF2; BaF2; ZnSe; and sapphire) as they were irradiated at the IBA chamber (exposed areas smaller than 10 mm2 and beam currents up to 100 nA) of the 3 MV TandetronTM. The total dose reached is in the range of 1016 at/cm2. The samples were evaluated for spectral optical and THz transmittance and reflectance. For this purpose, a Gooch & Housego spectroradiometer working in the range of 0.2-30 µm was used together with standard lamps, detectors and reflectance standards, for specular and diffuse reflectance measurements. In the mean time, the refractive index, the attenuation and transmittance in the THz range were determined using the TeraView TPS3000 spectrometer. Moreover, their homogeneity was tested using an imaging system working in THz range.
Acknowledgement:
The authors acknowledge the financial support of Romanian Space Agency (ROSA) through the project “Evaluation of Components for Space Applications - ECSA”, contract 67/ 2013. Some of the equipments used in this research were purchased in the frame of the project “Center for Advanced Lasers Technologies (CETAL)”, contract 8PM/2010, financed by UEFISCDI.
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