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天文热阻隔滤光片ASAHI SPECTRA

简要描述:天文热阻隔滤光片ASAHI SPECTRA
开发的真空沉积技术,如离子辅助沉积(IAD),离子束溅射(IBS),实现硬涂层的环境(湿度,低或高的温度,热冲击或真空)的优良的耐用性和稳定性光谱性能。

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  • 厂商性质:生产厂家
  • 更新时间:2018-09-06
  • 访  问  量:204
详细介绍

天文热阻隔滤光片ASAHI SPECTRA

Thermal blocking filters

Unlike filters in optical region, there are harder requirements for astronomical IR filters.
HgCdTe (MCT) imaging sensor requires IR filters to have very wide blocking range, often from 0.4 μm to 3.0 μm, sometimes ~ 5.0 μm.
Vacuum and cryogenic environment also requires IR filter to be made with monolithic substrate to avoid the abrasion of cement bythermal shock.
Eventually incredible number of thick interference film layers are necessary to fulfill these requirements.

These days thermal blocking filter is asked as well as Mauna Kea Observatories Y, J, H, and Ks filters.
We provided the thermal blocking filters to Dunlap Institute for Astronomy and Astrophysics in Canada in 2014. It was coated by the state-of-the-art magnetron sputtering technology on the monolithic fused silica substrate, and showed "beautiful" shape of passband and excellent blocking performance in IR (thermal) wavelengths.
Transmission curve was also measured and evaluated under the 77 K cryogenic condition with the witness sample at Asahi plant.

 

天文热阻隔滤光片ASAHI SPECTRA

 


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