Modification of a commercial fir laser system for efficient operation at 337 GHz

A simple comparative technique to characterize surface electrical resistance of small metallic samples at submillimeter wavelengths is presented. A quasioptical hemispherical resonator, fed by an optically pumped far-infrared laser is used, with the sample serving as the plane mirror. The cavity developed combines a small beam size at the sample, enabling measurements on samples with widths as small as 5 mm, with a large quality factor Q, so that surface resistance losses are readily measurable. This cavity uses a simple new geometry that feeds the cavity through a single small coupling hole that also serves as a system of monitoring energy storage in the cavity by means of a single external beamsplitter. An alternate approach of inserting an internal beamsplitter into the resonator was found to be unacceptable due to excessive losses and alignment problems.

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An experimental apparatus for measuring surface resistance in the submillimeter-wavelength region

Cook

Zwart

Long

et al. 1991

Review of Scientific Instruments

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The introduction of spurious modes in a hole-coupled Fabry-Pérot open resonator

Cook

Long

Heinen

et al. 1992

Review of Scientific Instruments

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A hemispherical open resonator has previously been used to make relative comparisons of the surface resistivity of metallic thin-film samples in the submillimeter wavelength region. This resonator is fed from a far-infrared laser via a small coupling hole in the center of the concave spherical mirror. The experimental arrangement, while desirable as a coupling geometry for monitoring weak emissions from the cavity, can lead to the introduction of spurious modes into the cavity. Sources of these modes are identified, and a simple alteration of the experimental apparatus to eliminate such modes is suggested.

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Modification of a commercial fir laser system for efficient operation at 337 GHz

Cited by 2 publications

References 6 publications

An experimental apparatus for measuring surface resistance in the submillimeter-wavelength region

An experimental apparatus for measuring surface resistance in the submillimeter-wavelength region

The introduction of spurious modes in a hole-coupled Fabry-Pérot open resonator

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