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WINERED (Warm INfrared Echelle spectrograph to Realize Extreme Dispersion and sensitivity) is a near-infrared high-resolution spectrograph developed by LiH. WINERED is a PI-type instrument, and is installed in the 3.58-meter New Technology Telescope (NTT) at the La Silla Observatory from 2017. WINERED has three distinctive features: warm optics (no cold stop), wide spectral coverage (0.90−1.35 μm), and high sensitivity. WINERED has three observing modes: "WIDE" (R≡ λ/Δ λFWHM=28,000) and "HIRES-Y&J" (R=68,000); the latter employs a specially designed high-blazed echelle grating. HIRES-Y&J modes are going to be in science operation by the middle of 2017.
1. Warm optics with no cold stop
(ⅰ) Optics are at room temperature except for the infrared camera system (camera lenses and an infrared array).
(ⅱ) Beneficial to reduce time and cost for development, alignment, and maintenance.
2. Wide spectral coverage
Achieved by a combination of decent optical design with a cross-dispersed echelle and a large format infrared array (2k x 2k).
3. High sensitivity
- HIRES-Y&J modes: high-blazed echelle gratings by Canon Inc. (>70%), VPH cross-dispersers (~90%).