New ITF measure method based on fringes

Qiaoran Fang; Shijie Liu; Wanrong Gao; You Zhou; HuanHuan Liu

doi:10.1117/12.2228450

26 January 2016 New ITF measure method based on fringes

Qiaoran Fang, Shijie Liu, Wanrong Gao, You Zhou, HuanHuan Liu

Proceedings Volume 9796, Selected Papers of the Photoelectronic Technology Committee Conferences held November 2015; 97960S (2016) https://doi.org/10.1117/12.2228450
Event: Selected Proceedings of the Chinese Society for Optical Engineering Conferences held November 2015, 2015, Various, China

Abstract

With the unprecedented developments of the intense laser and aerospace projects', the interferometer is widely used in detecting middle frequency indicators of the optical elements, which put forward very high request towards the interferometer system transfer function (ITF). Conventionally, the ITF is measured by comparing the power spectra of known phase objects such as high-quality phase step. However, the fabrication of phase step is complex and high-cost, especially in the measurement of large-aperture interferometer. In this paper, a new fringe method is proposed to measure the ITF without additional objects. The frequency was changed by adjusting the number of fringes, and the normalized transfer function value was measured at different frequencies. The ITF value measured by fringe method was consistent with the traditional phase step method, which confirms the feasibility of proposed method. Moreover, the measurement error caused by defocus was analyzed. The proposed method does not require the preparation of a step artifact, which greatly reduces the test cost, and is of great significance to the ITF measurement of large aperture interferometer.

Citation Download Citation

Qiaoran Fang, Shijie Liu, Wanrong Gao, You Zhou, and HuanHuan Liu "New ITF measure method based on fringes", Proc. SPIE 9796, Selected Papers of the Photoelectronic Technology Committee Conferences held November 2015, 97960S (26 January 2016); https://doi.org/10.1117/12.2228450

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KEYWORDS

Interferometers

Modulation

Phase shift keying

Spatial frequencies

Mirrors

Error analysis

Modulation transfer functions

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