Physics – Optics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0606c&link_type=abstract
American Astronomical Society, SPD meeting #42, #6.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Physics
Optics
Scientific paper
The NST Near-Infrared Imaging Spectropolarimeter is one of the first imaging solar spectro-polarimeters working in the near infrared (NIR). It has been installed and commissioned in the Coude Lab of the 1.6-meter NST at Big Bear Solar Observatory (BBSO). This innovative system, which includes a 2.5 nm interference filter, a unique 0.25 nm birefringent Lyot filter, and a Fabry-Perot etalon, is capable of providing a bandpass as low as 0.01 nm over a field-of-view (FOV) of 50" in a telecentric configuration. An NIR waveplate rotates ahead of M3 in the NST as the polarimeter modulator, and ahead of it a calibration unit is located to reduce polarization cross-talk induced by subsequent oblique mirrors. Dual-beam differential polarimetry is employed to minimize seeing-induced spurious polarization. Based on the unique advantages in IR window, the very capable NST with adaptive optics, it will provide unprecedented solar spectro-polarimetry with high Zeeman sensitivity (10-3Ic), high spatial resolution (0.2"), and high cadence (15s). In this presentation, we discuss the design, fabrication, and calibration, as well as showing the results of the first light observations.
Ahn Kyungjin
Cao Wenda
Coulter Roy
Goode Philip
Gorceix Nicolas
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