34th Solar Physics Division Meeting, June 2003
Session 20 Instrumentation
Poster, Wednesday, June 18, 2003, 3:30-5:00pm, Mezzanine

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[20.13] High-Resolution Infrared Filter System for Solar Spectroscopy and Polarimetry

W. Cao, J. Ma, J. Wang, P.R. Goode, H. Wang, C. Denker (New Jersey Institute of Technology, Physics Department, Center for Solar Research)

We report on the design of an imaging filter system working at the near infrared (NIR) of 1.56 \mum to obtain monochromatic images and to probe weak magnetic fields in different layers of the deep photosphere with high temporal resolution and spatial resolution at Big Bear Solar Observatory (BBSO). This filter system consists of an interference filter, a birefringent filter, and a Fabry-Pérot etalon. As the narrowest filter system, the infrared Fabry-Pérot plays an important role in achieving narrow band transmission and high throughput, maintaining wavelength tuning ability, and assuring stability and reliability. In this poster, we outline a set of methods for the evaluation and calibration of the near infrared Fabry-Pérot etalon. Two-dimensional characteristic maps of the near infrared Fabry-Pérot etalon, including full-width-at-half-maximum (FWHM), effective finesse, peak transmission, along with free spectral range, flatness, roughness, stability and repeatability were obtained with lab equipments. Finally, by utilizing these results, a detailed analysis of the filter performance for the Fe I 1.5648 \mum and Fe I 1.5652 \mum Zeeman sensitive lines is presented. These results will benefit the design of NIR spectro-polarimeter of Advanced Technology Solar Telescope (ATST).

The author(s) of this abstract have provided an email address for comments about the abstract: cao@njit.edu

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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.