20 October 2004 Large-optics white light interferometer using double-shearing structure for laser wavefront testing
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There is often large optics of several hundreds millimeters aperture in the laser communications transceiver which is nearly diffraction-limited laser beam at the same time. A revised Mach-Zehnder double-shearing interferometer is designed with 300 millimeters aperture which can be used for wave front analysis. Compare to the aperture-divided double lateral-shearing interferometer presented before, which is based on Jamin interferometer, this structure is easy to achieve for large aperture measurement without thick Jamin plates. In this paper, the interferometer with six same size plates is explained. One plate of them occupied as reflection is aperture-divided. Three changeable schemes are attained to get different wave front measurement ranges through adjusting angle between half-aperture plates. The interferometer is a white light interferometer. The interferometer is so designed that the equal optical path interference is hold though the shear is changing. It is useful for the short coherent length such as laser diode. The wave front aberration is deduced from the interferogram. The calibration is important especially for the Mach-Zehnder structure. Here two interferometers are adopted. One is Fisuea type used for parallel or angle adjustment, another generates plane wave better than 0.2λ with the laser and the high-quality plates. The method to use these apparatus is also explained in detail.
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Zhu Luan, Liren Liu, Lei Zhang, Shuyun Teng, De'an Liu, "Large-optics white light interferometer using double-shearing structure for laser wavefront testing", Proc. SPIE 5550, Free-Space Laser Communications IV, (20 October 2004); doi: 10.1117/12.557889; https://doi.org/10.1117/12.557889

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