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As graduate student, I was involved with the development of Acousto-Optical Spectrometers (AOS). I built the first broadband AOS
with 1 GHz bandwidth. It was installed at the ESO-SEST telescope
in La Silla. It has been modernized in the meantime, but essentially, it is still in operation. Following the SEST-AOS, I
built several AOS which are located around the world, including 2 AOSs for the
Antarctic Submillimeter Telescope and Remote Observatory (AST/RO) .
Based on the experience with AOSs, I tried to develop a new type of very wide-band spectrometer, the Optical Modulation Spectrometer. This development
was to happen in parallel with developments at the University of Cologne, Germany. They called their version
Laser Sideband Spectrometer. These spectrometers can be built with bandwidths of 10 to 40 GHz (or more). Currently they are used for
atmospheric research. However, applications in astronomy requiring large bandwidth, such as search and identification of high-z galaxies, are also doable.
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