用于植物培育实验的宽带负滤光片的研制

植物生长过程中对太阳光谱的吸收具有选择性。由于植物在光合作用和生长发育中对蓝紫光和红光较为敏感,因此设计并镀制了一种滤光片,目的是从太阳光谱中过滤掉植物吸收很少、且可能有害的黄绿光,从而采集植物生长所需要的蓝紫光和红光。通过离子源辅助电子枪蒸镀的物理沉积方式在大尺寸的K9玻璃基底上镀制了宽带负滤光片,镀膜后的滤光片在400~470nm和630~750nm波长范围内平均透过率大于90%,而500~580nm波长范围内平均透过率小于0.2%。结果表明该宽带负滤光片膜系的镀制满足植物培育实验的使用要求。

Fabrication of broadband negative filter for plant cultivation

Plant growth is selective to the absorption of the solar spectrum. Plants in the process of photosynthesis and growth are more sensitive to blue-violet light and red light. This paper designed and fabricated an optical filter to filter out yellow and green light with minimal absorption rate of photosynthesis so as to collect blue-violet light and red light which are necessary for plant growth. The broadband negative filter was prepared on the K9 substrate with large size through electron-beam evaporation system and ion assisted deposition system. The transmittance was over 90% at 400~470 nm and 630~750 nm wavelength band, and the reflectance at 500~580 nm wavelength band was less than 0.2%. The test results show that the broadband negative filter meet the requirements of the plant cultivation.