Note: Autocollimation with ultra-high resolution and stability using telephoto objective together with optical enlargement and beam drift compensation

Fan Zhu; Xinran Tan; Jiubin Tan; Zhigang Fan

doi:10.1063/1.4961689

Note: Autocollimation with ultra-high resolution and stability using telephoto objective together with optical enlargement and beam drift compensation

Rev Sci Instrum. 2016 Aug;87(8):086110. doi: 10.1063/1.4961689.

Authors

Fan Zhu¹, Xinran Tan², Jiubin Tan², Zhigang Fan¹

Affiliations

¹ Postdoctoral Research Station of Optical Engineering, Harbin Institute of Technology, Harbin 150080, China.
² Center of Ultra-precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, Harbin 150080, China.

PMID: 27587181
DOI: 10.1063/1.4961689

Abstract

An autocollimation (AC) setup with ultra-high resolution and stability for micro-angle measurement is presented. The telephoto objective, which is characterized in long focal length at a compact structure size, and the optical enlargement unit, which can magnify the image displacement to improve its measurement resolution and accuracy, are used to obtain an ultra-high measurement resolution of the AC. The common-path beam drift compensation is used to suppress the drift of measurement results, which is evident in the high-resolution AC, thus to obtain a high measurement stability. Experimental results indicate that an effective resolution of better than 0.0005 arc sec (2.42 nrad) over a measurement range of ±30 arc sec and a 2-h stability of 0.0061 arc sec (29.57 nrad) can be achieved.