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Proceedings Paper

Electron beam irradiation of materials and components to be used in mid-IR spectroscopy
Author(s): Dan Sporea; Laura Mihai; Adelina Sporea; Gabriela Crăciun; Elena Mănăilă
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Paper Abstract

In this paper, we report the results concerning electron beam irradiation of mid-IR windows and mid-IR detectors for possible use in trace gas detection systems, in the 1 μm to 5 μm spectral range under ionizing radiation conditions. Four windows materials (CaF2, BaF2, ZnSe, and sapphire) for the mid-IR were tested as they were exposed to electron beam irradiation at a dose rate of 4 kGy/min, for doses from 0.5 kGy to 2.2 kGy. Two IR detectors (photoconductive – PbSe, photovoltaic – InAs) were subjected to the same type of irradiation at dose rate of 4 kGy/min, in three subsequent exposures, for a total dose up to 6.8 kGy. Before the irradiation and after each irradiation step the windows were measured as it concerns the spectral optical transmittance, spectral optical diffuse reflectance, and, in the THz range (0.06 THz – 3 THz), the dielectric constant and the refractive index were evaluated. THz imaging analysis of the irradiated samples was done. For the IR detectors we measured at different irradiation stages the spectral responsivity and the dark current. The most affected by electron beam irradiation was the CaF2 window, in the spectral interval 250 nm – 800 nm. The spectral transmittance of the four windows remained unchanged after their exposure to ionizing radiation in the near-IR and mid-IR. Noticeable variations of the spectral responsivity appeared upon electron beam irradiation in the case of the InAs detector.

Paper Details

Date Published: 29 April 2016
PDF: 7 pages
Proc. SPIE 9899, Optical Sensing and Detection IV, 98990O (29 April 2016); doi: 10.1117/12.2230234
Show Author Affiliations
Dan Sporea, National Institute for Laser, Plasma and Radiation Physics (Romania)
Laura Mihai, National Institute for Laser, Plasma and Radiation Physics (Romania)
Adelina Sporea, National Institute for Laser, Plasma and Radiation Physics (Romania)
Gabriela Crăciun, National Institute for Laser, Plasma and Radiation Physics (Romania)
Elena Mănăilă, National Institute for Laser, Plasma and Radiation Physics (Romania)


Published in SPIE Proceedings Vol. 9899:
Optical Sensing and Detection IV
Francis Berghmans; Anna G. Mignani, Editor(s)

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