Medium wave infrared filter based on lead germanium tellurium high refractive index material
An infrared filter and high refractive index technology, applied in the field of optical filters, can solve problems such as the inability to apply the mid-wave infrared band, and achieve the effect of increasing the refractive index ratio nH/nL and improving spectral performance
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[0014] Using tellurium germanium lead as the high refractive index film material and silicon dioxide as the low refractive index film material to prepare a mid-wave infrared narrow-band filter with a center wavelength of 4um, the film system is designed as follows:
[0015] Sub|HLLHLHLLHL|Air
[0016] Such as figure 2 As shown, the bandwidth of the filter using tellurium-germanium-lead as the high-refractive index film material is only 160nm, while the same film system uses germanium as the high-refractive index film material. The bandwidth of the filter is 390nm.
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