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首页> 外文会议>SPIE Astronomical Telescopes + Instrumentation Conference >Reflective optical system made entirely of ultra low thermal expansion ceramics: A possibility of genuine athermal cryogenic IR instrument
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Reflective optical system made entirely of ultra low thermal expansion ceramics: A possibility of genuine athermal cryogenic IR instrument

机译：完全由超低热膨胀陶瓷制成的反射光学系统：真正的非热低温红外仪器的可能性

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Reflective optical system free from chromatic aberration is essential for astronomical instruments, which usually require wider wavelength coverage. However, it cannot always be the optimum choice compared with refractive optical system in terms of cost-effectiveness because mirrors require high surface accuracy and also because non-co-axial systems force tough alignment work. This dilemma could be overcome by a monolithic reflective optical system made entirely of cordierite CO-720, a ceramic material by Kyocera, which is the first material that offers both high-precision 3D-shaping and surface polishing for optical quality. This material also possesses a very low coefficient of thermal expansion (CTE) enabling a genuine athermal system useful for various astronomical applications. This athermality could make a significant breakthrough especially for cryogenic infrared instruments since optical systems made of cordierite are expected to keep as-built performance throughout the cooling process, providing extremely high wavefront accuracy that has never been possible at cryogenic temperature with conventional optical systems made of glasses or metals. In this paper, we report the first cryogenic optical testing of a small cordierite-made imaging optical system that was simply assembled with mechanical accuracy at room temperature. We confirmed that the diffraction-limited optical performance is kept even down to ~80K as built in the room temperature.
机译：对于通常需要更宽波长范围的天文仪器来说，没有色差的反射光学系统必不可少。然而，就成本效益而言，与折射光学系统相比，它并非始终是最佳选择，因为反射镜需要很高的表面精度，而且由于非同轴系统会强制进行艰难的对准工作。完全由堇青石CO-720（一种由Kyocera生产的陶瓷材料）制成的单片反射光学系统可以克服这一难题，这是第一种同时提供高精度3D成形和表面抛光以提高光学质量的材料。这种材料还具有非常低的热膨胀系数（CTE），可用于各种天文应用的真正的无热系统。这种无热性可能会取得重大突破，尤其是对于低温红外仪器而言，因为期望由堇青石制成的光学系统在整个冷却过程中都能保持原样的性能，从而提供极高的波前精度，这在低温下是传统的光学系统无法实现的。玻璃或金属。在本文中，我们报告了由堇青石制成的小型成像光学系统的首次低温光学测试，该系统简单地在室温下以机械精度组装在一起。我们确认，在室温条件下，衍射极限光学性能甚至可以保持低至〜80K。

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