Two-Dimensional Virtual Grating Phase Shifting Moire Fringe Method of Phase Extraction

Chen, 陈晨 Chen; Ke, 刘克 Liu; Yanqiu, 李艳秋 Li; Hai, 汪海 Wang

doi:10.3788/cjl201542.0208004

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2018

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“…The phase error can be retrieved from the far-field distribution by a two-dimensional Fourier transform algorithm [26]. The far-field distribution can also be regarded similar to the Moiré fringe pattern [27], thus the phase perturbation can be extracted from the movement of the superimposed fringe in each direction.…”

Section: Multi-beam Cbcmentioning

confidence: 99%

A full-path phasing technique based on the far-field interference fringe for tiled-aperture coherent beam combining

Peng

Liu

et al. 2018

Laser Phys. Lett.

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We propose a new phase error measurement and control technique based on the far-field interference fringe (FFIF) for a coherent beam combined with a tiled-aperture design. By using this method, the phase error can be directly measured at the focal plane, enabling a visual monitor of full-path measurement without introducing extra optical elements before focusing. The analytical expression of the relation between far-field distributions and phase errors is derived, which gives a theory guidance by the phase extraction from the FFIF. A proof of the principle experiment is demonstrated and a residual phase jitter of 0.157 rad (approximately 1/40 λ) is achieved, which is adequate for a coherent beam combined with femtosecond pulses.

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Section: Multi-beam Cbcmentioning

confidence: 99%