VPHGs abused

Details VPHGs abused VPHGs abused

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spie.6269e.180m&link_type=abstract

Ground-based and Airborne Instrumentation for Astronomy. Edited by McLean, Ian S.; Iye, Masanori. Proceedings of the SPIE, Volu

Astronomy and Astrophysics

Astronomy

Scientific paper

The introduction of high efficiency Volume Phase Holographic Gratings (VPHGs) in astronomy led to a double think about instrumentation. Old instruments await miracles and new instrumentations are in search of a different look. Indeed the non conventional uses of dispersing elements can open new possibilities in instrumentation design. Counterdispersing couples of VPHGs are best suitable for narrow and medium band filtering. Their easy handling and macro movements will allow also a tunability of the filtering which promises good performances and robust control system. Multiplication or cascades of this principle will lead to the design of complex multi-imaging instrumentations. Also multi order spectroscopy can take advantage of VPHG smart positioning. Slanting and multilayers in their manufacturing as well as optimized optical geometries can be exploited in order to reach high performance, large spectral coverage spectrographs. We present here a set of concepts which can be applicated to very generation of astronomical instrumentations.

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