中国科学院南京天文光学技术研究所机构知识库

We have produced a series of reflective mirrors using the newly installed 1.6m evaporation chamber at the Nanjing Institute of Astronomical Optics and Technology (NIAOT) of the National Astronomical Observatories of China. The main task of  this equipment is to coat the mirrors of the LAMOST. The chamber have thermal evaporation system, electron beam source, ion beam source, quartz crystal deposition controller and optical monitoring system, so can evaporate all kinds of metal and oxide film and effectively control film thickness. Now, we have utilized this chamber to aluminize the mirrors of LAMOST primary mirror, the average reflectivity is above 89% in the wavelength range from 370nm to 900nm. Recently, we have completed the enhanced silver reflector experiment, by controlling the dielectric layers optical thickness, the reflectivity is increased from 370nm to 400nm. The average reflectivity of enhanced silver reflector is above 97% in the wavelength range from 370nm to 900nm.