Multiband filters for near-infrared astronomical applications

James E. Rhoads; Sangeeta Malhotra; Paul Scowen; Ron Probst; Don McCarthy

doi:10.1117/12.856737

20 July 2010 Multiband filters for near-infrared astronomical applications

James E. Rhoads, Sangeeta Malhotra, Paul Scowen, Ron Probst, Don McCarthy

Proceedings Volume 7735, Ground-based and Airborne Instrumentation for Astronomy III; 77356C (2010) https://doi.org/10.1117/12.856737
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

Filters for astronomical imaging traditionally have a simple bandpass that admits (more or less equally) all the photons within some bandwith ▵λ around some central wavelength λ0. However, there are situations where not all photons are equally desirable. We plan to develop and apply multiband filters for practical astronomical application. A multiband filter is a bandpass filter whose transmission dips to zero at select, undesired wavelength ranges. Anticipated applications include (i) OH-suppressing filters, especially in the J band (λc ≈ 1.2μm); (ii) economy of filter slots through multi-band filters used in series with broad blocking filters; and (iii) efficient searches for object classes with highly structured spectra. We present the design and anticipated photometric properties of a prototype reduced-background J_R filter, which we plan to buy and test in 2010.

Citation Download Citation

James E. Rhoads, Sangeeta Malhotra, Paul Scowen, Ron Probst, and Don McCarthy "Multiband filters for near-infrared astronomical applications", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77356C (20 July 2010); https://doi.org/10.1117/12.856737

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