10 June 1996 HTS Fabry-Perot resonators for the far infrared
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We report on far infrared (FIR) Fabry-Perot resonators (FPR) with high temperature superconductor (HTS) thin films as mirrors. For the fabrication of FPR we use two parallel MgO plates covered with YBa2Cu3O7-delta thin films on adjacent sides. We have measured the far-infrared transmissivity at 10 K with a Fourier transform infrared spectrometer. Very sharp resonances can be observed for frequencies below 6 THz where the MgO is transparent. The finesse (width of the first order resonance) is comparable to the FPR with metallic meshes as reflectors that are applied in the FIR spectroscopy and astronomy. We have also shown that thin films of gold are not adequate substitute to HTS thin films and not suitable for the fabrication of high-quality FPR due to the ohmic losses.
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Philipp Keller, Philipp Keller, Martin Prenninger, Martin Prenninger, Evgeny V. Pechen, Evgeny V. Pechen, Karl F. Renk, Karl F. Renk, } "HTS Fabry-Perot resonators for the far infrared", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); doi: 10.1117/12.241802; https://doi.org/10.1117/12.241802

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