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Proceedings Paper

The LNA VPH characterization experiment
Author(s): Flávio F. Ribeiro; Orlando J. Katime-Santrich; Clemens D. Gneiding; Bruno V. Castilho; Rodrigo P. Campos; Rogério A. Nicolau
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Paper Abstract

The use of Volume Phase Holographic (VPH) gratings in astronomy is increasing worldwide due to its high efficiency, flexibility in manufacturing and lower costs. For example 3 of 4 SOAR Telescope spectrographs are based on VPH gratings. Following the growth in this technology use, tools are needed to characterize these gratings for their physical and diffraction efficiency properties. We developed, at Laboratorio Nacional de Astrofisica / MCT (LNA), Brazil, an assembly for characterization of VPH gratings. The relative efficiency of the gratings can be measured for specific angles or scanned through the grating operation angles. Furthermore surface flatness and mounting stress effects are measured using interferometric techniques. We present the experiment design and characteristics, describe the measurement procedures and show the characterization results for some gratings of the SOAR Telescope spectrograph STELES.

Paper Details

Date Published: 23 July 2008
PDF: 10 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70184V (23 July 2008); doi: 10.1117/12.789513
Show Author Affiliations
Flávio F. Ribeiro, Lab. Nacional de Astrofísica, MCT (Brazil)
Univ. Federal de Itajubá (Brazil)
Orlando J. Katime-Santrich, Lab. Nacional de Astrofísica, MCT (Brazil)
Univ. Federal de Itajubá (Brazil)
Clemens D. Gneiding, Lab. Nacional de Astrofísica, MCT (Brazil)
Bruno V. Castilho, Lab. Nacional de Astrofísica, MCT (Brazil)
Rodrigo P. Campos, Lab. Nacional de Astrofísica, MCT (Brazil)
Rogério A. Nicolau, Lab. Nacional de Astrofísica, MCT (Brazil)


Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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