Acta Optica Sinica, Volume. 34, Issue 7, 731003(2014)
Fabrication of a Narrow Bandpass Optical Filter with Central Wavelength at 14.95 μm
The design and fabrication of infrared ultra-narrow bandpass filters is presented, which have been employed in the channel No.1 in the infrared atmospheric sounder (IRAS). The filters are fabricated using Te-rich PbTe as the high-index coating material. By choosing suitable deposition rate and substrate temperature, the carrier concentration in the layers of PbTe can be controlled to a lower level in order to obtain the higher transmittance for the filters. The filters have a central wavelength at 14.95 μm and a bandwidth of 0.065 μm. The relative bandwidth is less than 0.5%. The filter has been used in space and worked stably for five years in the data acquisition of weather forecast.
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Zhang Lin, Ni Rong, Huang Chun, Li Bin, Liu Dingquan. Fabrication of a Narrow Bandpass Optical Filter with Central Wavelength at 14.95 μm[J]. Acta Optica Sinica, 2014, 34(7): 731003
Category: Thin Films
Received: Sep. 1, 2013
Accepted: --
Published Online: Jun. 10, 2014
The Author Email: Lin Zhang (zhanglin@mail.sitp.ac.cn)