Thin-film filters for a high resolution miniaturized spectrometer

Angela Piegari; Anna K. Sytchkova; Jiri Bulir; Bernd Harnisch; Andreas Wuttig

doi:10.1117/12.797286

25 September 2008 Thin-film filters for a high resolution miniaturized spectrometer

Angela Piegari, Anna K. Sytchkova, Jiri Bulir, Bernd Harnisch, Andreas Wuttig

Proceedings Volume 7101, Advances in Optical Thin Films III; 710113 (2008) https://doi.org/10.1117/12.797286
Event: Optical Systems Design, 2008, Glasgow, Scotland, United Kingdom

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.

Citation Download Citation

Angela Piegari, Anna K. Sytchkova, Jiri Bulir, Bernd Harnisch, and Andreas Wuttig "Thin-film filters for a high resolution miniaturized spectrometer", Proc. SPIE 7101, Advances in Optical Thin Films III, 710113 (25 September 2008); https://doi.org/10.1117/12.797286

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