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Abstract
The Aerological Observatory completed new optical alignment systems for accurate optical alignment of Brewer spectrophotometers in the Japan Meteorological Agency (JMA) network. The systems consist of a Helium-Neon (632.8nm) laser system with a beam expander, an optical bench, a laser holder and adjusters, a Helium-Cadmium (441.6/325.0nm) laser system with a lens unit, and a turntable with adjustable feet for leveling. 1) The He-Ne (632.8nm) system is useful for aligning all MKII optics from foreoptics to photomultiplier, and MKIII optics from foreoptics to the tilted lens. 2) The 441.6nm laser of the He-Cd system can align MKII and MKIII optics from foreoptics to the tilted lens. The 325.0nm laser of the same system can align all MKII and MKIII optics with high accuracy. No difference was observed in laser beam axes between 441.6nm and 325.0nm lasers when the switching shutter was operated. The 325.0nm laser is useful for measuring wavelength shift, optical resolution, and stray light. 3) The turntable can align the foreoptics and the spectrometer with their laser systems.
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