Abstract
A vacuum-compatible vertical-laser alignment method based on an oil mirror and an air-spaced lens is used to measure and compensate for the vertical deviation angle of the laser beams in a joule balance. This paper reports improvements in this alignment method regarding the focal-plane positioning error, off-axis error of the lens, tradeoff of oil mirror parameters, and measurement resolution. Dual spot coincidence is used to locate the lens focal plane, and the optimal collimation region in the Gaussian beam of the laser source is located, which is regarded as a parallel light source. An observation mechanism is designed to realize the online detection of the lens off-axis distance, and the optimal area for balancing the influence of the angular error of the corner cube and the lens off-axis distance is preliminarily obtained. The performance parameters of silicone oil are balanced, and the measurement resolution is improved from three perspectives. The sealing performance of the chamber for containing silicone oil is also verified experimentally. Furthermore, through an experiment, the measurement accuracy of the vertical-laser alignment method is preliminarily verified.
Published Version
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