Kyoto tridimensional spectrograph II: progress

Hajime Sugai; Hiroshi Ohtani; Shinobu Ozaki; Takashi Hattori; Motomi Ishii; Tsuyoshi Ishigaki; Tadashi Hayashi; Minoru Sasaki; Norihide Takeyama

doi:10.1117/12.395514

16 August 2000 Kyoto tridimensional spectrograph II: progress

Hajime Sugai, Hiroshi Ohtani, Shinobu Ozaki, Takashi Hattori, Motomi Ishii, Tsuyoshi Ishigaki, Tadashi Hayashi, Minoru Sasaki, Norihide Takeyama

Author Affiliations +

Proceedings Volume 4008, Optical and IR Telescope Instrumentation and Detectors; (2000) https://doi.org/10.1117/12.395514
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

Abstract

We are building the Kyoto tridimensional spectrograph II and are planning to mount it on Subaru telescope. The spectrograph has four observational modes: Fabry-Perot imager, integral field spectrograph (IFS) with a microlens array, long-slit spectrograph, and filter-imaging modes. The optics is designed to be used in wide wavelength range from 360 nm to 900 nm. The design well matches with high spatial resolution of Subaru: 0 inch .06 pixel^-1 in Fabry- Perot mode, for which we actually will use binning before adaptive optics at optical wavelengths becomes available, and 0 inch .1 lens^-1 in microlens array mode. These well sample image sizes obtained by Subaru, which are about 0 inch .4 in relatively good conditions. We have evaluated a point spread function of our cylindrical microlens array and found that it consists of a diffraction pattern and more extended component which probably comes from border regions between microlenses. With a suitable mask at the micro pupil position, the crosstalk between spectra will be limited down to a few percent. With a suitable mask at the micro pupil position, the crosstalk between spectra will be limited down to a few percent. We have succeeded in synchronizing frequency switching of Fabry-Perot etalons with the movement of charge on the CCD. This technique enables to average out all temporal variations between each passband.

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Hajime Sugai, Hiroshi Ohtani, Shinobu Ozaki, Takashi Hattori, Motomi Ishii, Tsuyoshi Ishigaki, Tadashi Hayashi, Minoru Sasaki, and Norihide Takeyama "Kyoto tridimensional spectrograph II: progress", Proc. SPIE 4008, Optical and IR Telescope Instrumentation and Detectors, (16 August 2000); https://doi.org/10.1117/12.395514

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