MSE spectrograph optical design: a novel pupil slicing technique
| Autor: | P. Spanò |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Infrared devices
Astronomy Physics::Optics CFHT Grating Dichroic glass Multiplexing Collimated light law.invention Optics MSE law Spectrographs pupil-slicing High resolution Spectral resolution Spectrograph Physics business.industry Optical design Cameras VPH gratings Optical coating Optoelectronics Glass business Multiobject spectroscopy Beam splitter |
| Popis: | The Maunakea Spectroscopic Explorer shall be mainly devoted to perform deep, wide-field, spectroscopic surveys at spectral resolutions from ∼2000 to ∼20000, at visible and near-infrared wavelengths. Simultaneous spectral coverage at low resolution is required, while at high resolution only selected windows can be covered. Moreover, very high multiplexing (3200 objects) must be obtained at low resolution. At higher resolutions a decreased number of objects (∼800) can be observed. To meet such high demanding requirements, a fiber-fed multi-object spectrograph concept has been designed by pupil-slicing the collimated beam, followed by multiple dispersive and camera optics. Different resolution modes are obtained by introducing anamorphic lenslets in front of the fiber arrays. The spectrograph is able to switch between three resolution modes (2000, 6500, 20000) by removing the anamorphic lenses and exchanging gratings. Camera lenses are fixed in place to increase stability. To enhance throughput, VPH first-order gratings has been preferred over echelle gratings. Moreover, throughput is kept high over all wavelength ranges by splitting light into more arms by dichroic beamsplitters and optimizing efficiency for each channel by proper selection of glass materials, coatings, and grating parameters. Ground-Based and Airborne Instrumentation for Astronomy V, June 22-26, 2014 Series: Proceedings of SPIE; no. 9147 |
| Databáze: | OpenAIRE |
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