TY  - JOUR
AU  - Kasparek, W.
AU  - Fernandez, A.
AU  - Hollmann, F.
AU  - Wacker, R.
PY  - 2001
DA  - 2001//
TI  - Measurements of ohmic losses of metallic reflectors at 140 GHz using a 3-mirror resonator technique
JO  - Int. J. Infrared and Millimeter Waves
SP  - 1695
EP  - 1707
VL  - 22
IS  - 11
KW  - mirror
KW  - reflection index
KW  - emissivity
KW  - Fabry-Perot interferometer
KW  - subterahertz
KW  - subTHz
AB  - The reflectivity of metallic mirrors in the millimeter wave region does not only depend on the material, but also on the structure and roughness of the surface. We have performed measurements of the reflectivity of various plane and grooved metallic and graphite samples at 140 GHz. The technique is based on the comparison of the quality factor of a 2-mirror reference resonator with the quality factor of a 3-mirror resonator which has identical dimensions and includes the mirror to be tested. After a brief presentation of the theory, the set-up is described and the reflection loss for various aluminium and copper mirrors as well as vacuum compatible materials for applications in thermonuclear fusion experiments are presented and discussed.
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ID  - Kasparek_etal2001
ER  -