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Proceedings Paper

Thin-film filters for a high resolution miniaturized spectrometer
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Paper Abstract

A lightweight and compact spectrometer with spectral resolution in the order of 0.1 nm, in a spectral range from UV to NIR, can be implemented using a spectral pre-selection technique at the spectrometer entrance, through transmission variable filters. Such filters, based on thin-film optical coatings, have either a transmission peak or a transmission edge that moves along one direction of the filter surface. Depending on the spectrometer design, different configurations of the pre-selection device are possible. The operating spectral range (240-800 nm) is divided in a number of sub-ranges and in each of them the filter transmission peak, or edge, is displaced from the minimum to the maximum wavelength over a distance of few mm. Two cases are considered: a configuration with both a narrow-band transmission filter and a band-pass filter having a linear spatial variation and a configuration with an edge filter having a non-linear spatial variation. To obtain the required spatial profile of filter performance, a graded coating is deposited on a fused silica substrate, by r.f. sputtering with a moving mask. Details on filter requirements and fabrication technology are reported.

Paper Details

Date Published: 25 September 2008
PDF: 8 pages
Proc. SPIE 7101, Advances in Optical Thin Films III, 710113 (25 September 2008); doi: 10.1117/12.797286
Show Author Affiliations
Angela Piegari, ENEA (Italy)
Anna K. Sytchkova, ENEA (Italy)
Jiri Bulir, ENEA (Italy)
Institute of Physics (Czech Republic)
Bernd Harnisch, ESA-ESTEC (Netherlands)
Andreas Wuttig, Institute of Photonic Technology (Germany)

Published in SPIE Proceedings Vol. 7101:
Advances in Optical Thin Films III
Norbert Kaiser; Michel Lequime; H. Angus Macleod, Editor(s)

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