QUASI-OPTICAL SYSTEMS

Thomas Keating Ltd has made a feature of its activities the design and construction of Quasi-optical systems operating in the THz region.

Recent examples include very low standing wave Pulsed ESR spectrometer optics for St Andrews

Quasi-optical components - mirrors and corrugated horns for KAO in Korea to form the multiplexer for the KVN array in Korea. QMC Instruments Ltd also supplied the multiplexing filters.

Dr Seog-Tae Han watches as the filters are installed in a moving mechanism in May 2007


We designed and built for the National Institute for Fusion Science, Nagoya, Japan a two colour interferometer to measure electron line density in their new Large Helical Device [LHD].

Click here for more details. JET have kindly provided us with details of the similar instrument we built with AEA Fusion, upon which the NIFS system is based.

Quasian Beam-Mode optics is the foundation of all of our work here, and it is coded into our Gaussian Beam-Mode CAD program. Our systems tend to be built around simple split cubes, such as the one seen on the left below. These can take lenses on their sides and polarizing wire guids along their diagonal. On the right is a translating rotating grid, which can be used to generate a known reflector in both amplitude and phase. This component is crucial to the operation of Null reflectometers.

Here is an example of an 80-94 Polarization analyser built for DRA Malvern. It is our view that all waveguide components have direct equivalents in Quasi-optics. Even isolators can be built using Faraday rotators using permanantly magnetised Ferrites.

and here is a materials measuring interferometer built to measure solids, liquids and even gasses:

Below is a Quasi-Optical system for Impedance Measurements recently constructed for SRON (Space Research Organization Netherlands)