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How to improve transmissive optics in the very far infrared?

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Conclusion

We have presented the possibility to make optical coatings on quartz in the FIR and we have got a transmission coefficient as high as 97% at room temperature. It will rise probably close to 100% at liquid helium temperature where the quartz two-phonon difference processes are frozen. The use of polyethylene or TPX is also possible to make plates and lenses. The reflectivity losses are smaller because the refractive index is much smaller, but they cannot be further reduced by any coating because there is no transparent material with n≈1.2 in the FIR. These lenses are very useful in the FIR (except around 60 cm−1 if they are made of polyethylene). TPX is quite transparent over the whole FIR range, and also in the visible with nearly the same refractive index as in the FIR. Alignments can be made with visible light, and still work in the FIR.

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Authors and Affiliations

  1. CEA CESTA 3314 -LEBARP, B.P. n∘ 2, France

    Michel Josse

  2. Lab. Infrarouge Lointain, L.M.C.P.I, U.R.A.-C.N.R.S. n∘ 809, B.P. 239, F-54506, Vanoeuvre-lès-Nancy Cedex

    Xavier Gerbaux & Armand Hadni

Authors
  1. Michel Josse
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  2. Xavier Gerbaux
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  3. Armand Hadni
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Josse, M., Gerbaux, X. & Hadni, A. How to improve transmissive optics in the very far infrared?. Int J Infrared Milli Waves 14, 1381–1387 (1993). https://doi.org/10.1007/BF02084413

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  • DOI: https://doi.org/10.1007/BF02084413

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