| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2012: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2011: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2010: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Research Abstract |
We developed ZnS immersion grating which is a main disperser for the next generation optical/NIR high resolution spectrograph attached to the ground-based 30m telescopes and/or large space telescopes. Using a fly-cutting technique with the nano precision machining equipment in LLNL, we obtained the grooves on the CVD-ZnS prism with the relative diffraction efficiency of 72.8% at 1 um. And, we succeeded to fabricate the new reflective Cu coating with a SiO2 protection and anti-reflection thin-layer between the ZnS bulk and Cu, which achieved the high reflectivity over 90% from 0.8 to 1.5um. Therefore, we have a prospect of realizing the ZnS immersion grating for optican and NIR astronomical application.
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